Increase Of Inlet Pressure Research Articles

Multi-field Coupling Analysis of Electrolytic Machining of Magazine Mounts Based on COMSOL

In electrolytic processing, the flow field of the electrolyte, the applied voltage, and the magnetic effect of the current itself have a significant effect on the stability, efficiency, and surface quality of the process. In this paper, the effects of different inlet pressures on the flow rate and different treatment voltages on the current density and magnetic induction strength are investigated by coupling several fields, such as flow, electric and magnetic fields, using COMSOL software. The simulation results show that the flow rate increases with the increase of inlet pressure, and the flow rate increases by 1 m/s for every 0.1 MPa. The current density increases with the increase of processing voltage, but its uniformity decreases, and the magnetic effect of the current itself also influences the magnitude of the current density

Experimental investigation on the cavitation modulation mechanism in submerged self-sustained oscillating jets

To investigate the cavitation evolution states in chamber and its modulation on the self-sustained oscillation, experimental research is conducted in the nozzles with three different chamber lengths using high-speed photography and high frequency sensors. The experiment results indicate that with the increase of the chamber length of Helmholtz nozzles utilized in this study, the intensity of cavitation gradually decreases and the complex congestion cavitation state will switch to the periodic shedding annular cavitation cloud and even discrete free cavitation. With the increase of inlet pressure, the self-maintenance of Helmholtz vortex ring in the jet shear layer enhances, making the random components in the shear layer and the chaotic degree of the flow field reduce. For the submerged self-sustained oscillating jets, the cavitation structure in the nozzle can be regarded as an accumulator, which shrinks and expands periodically to determine the release and aggregation of energy and modulates the pulsation frequency and intensity of the pulsed jet induced by Helmholtz nozzles. The amplitude of pressure pulsation is positively correlated with the cavitation intensity, which means that the pulsation performance of the self-sustained oscillating pulsed jet gets better with the increase of the cavitation intensity.

Experimental research on aerosol scrubbing characteristics under steam-air mixture submerged jet condition

The occurrence of severe accidents in nuclear power plants may lead to the leakage of radioactive aerosol. And the scrubbing efficiency of aerosol contained in the air-steam mixture submerged jet is important for assessing the radioactivity in the containment during a severe accident. Several experiments were carried out to analyze the effect of inlet pressure, aerosol diameter, submergence, and steam fraction on the scrubbing efficiency of aerosol in the jet regime. Then, the scrubbing effects of steam and different flow regimes under submerged jet conditions were investigated by comparing the experimental results. The scrubbing efficiency increased with the increase of the aerosol diameter in the air jet regime while the most penetrating region of the aerosol in the steam-air mixture jet regime is 0.2–0.4 μm. When the gas flow characteristic is subcritical flow, as the inlet pressure increases, the scrubbing efficiency increases rapidly. When the critical flow is reached, the inertial effect was the dominant factor in aerosol scrubbing due to the sufficient gas velocity, the scrubbing efficiency under different steam fractions is close to 100%. The scrubbing efficiency increases with the increase of the steam fraction, which may be caused by the increase of the temperature gradient field under subcritical flow conditions. Additionally, the increase the submergence can increase the residence time and improve the scrubbing efficiency. However, due to the decrease of the gas velocity during the gas floating, the scrubbing efficiency in the flow region of the same height is gradually decreasing.

Numerical simulation and experimental verification of plasma jet development in gas gap switch

Plasma jet triggered gas gap switch has obvious advantages in fast control switch. The development of the plasma in the ambient medium is the key factor affecting the triggering conduction of the gas switch. However, the plasma jet process and its characteristic parameters are complicated and the existing test methods cannot fully characterize its development laws. In this work, a two-dimensional transient fluid calculation model of the plasma jet process of the gas gap switch is established based on the renormalization-group k-ε turbulence equation. The results show that the characteristic parameters and morphological evolution of the plasma jet are basically consistent with the experimental results, which verifies the accuracy of the simulation model calculation. The plasma jet is a long strip with an initial velocity of 1.0 km·s−1 and develops in both axial and radial directions. The jet velocity fluctuates significantly with axial height. As the plasma jet enters the main gap, the pressure inside the trigger cavity drops by 80%, resulting in a rapid drop in the jet velocity. When the plasma jet head interacts with the atmosphere, the two-phase fluid compresses each other, generating a forward-propelled pressure wave. The plasma jet heads flow at high velocity, a negative pressure zone is formed in the middle part of the jet, and the pressure peak decreases gradually with height. As the value of the inlet pressure increases, the characteristic parameters of the plasma jet increase. The entrainment phenomenon is evident, which leads to an increase in the pressure imbalance of the atmospheric gas medium, leading to a significant Coandǎ effect. Compared with air, the characteristic parameters of a plasma jet in SF6 are lower, and the morphological evolution is significantly suppressed. The results of this study can provide some insight into the mechanism of action of the switch jet plasma development process.

Thermodynamic evaluation on a new CO2 energy storage system assisted by adsorption bed

The share of renewable energy in energy systems is increasing under the background of the accelerated transformation on the current energy structure. Energy storage technologies enjoy excellent functions in dealing with the problems arising from the extensive applications of renewable energies. A compressed CO2 energy storage system configured with adsorption bed is proposed with the merits of high efficiency and large energy density in this paper. The gaseous working fluid at the turbine outlet is directly absorbed and stored by the adsorbent material in the adsorption bed, which solves the low-pressure CO2 storage problem. The thermodynamic performance and parametric analysis are investigated by establishing mathematical models of the proposed system. Results demonstrate that the maximum efficiency can be identified and the optimized HPC exit pressure is shifted to the right when the HPT inlet pressure is lower than 14 MPa, and then it is located at 15 MPa. The curve of system efficiency declines almost in a layered manner with the increase in HPT inlet pressure. The maximum efficiency is ensured by locating HPC exit pressure at 13 MPa and HPT inlet pressure at 12 MPa. Under this condition, the efficiency and energy density can reach 68.79 % and 17.44 kWh/m3, which reveals that the system efficiency is competitive and its energy density is more superior with about 5–6 times of that of the adiabatic compressed air energy storage technique.

Simulation and experimental measurements of 10-kW PEMFC passive hydrogen recovery system

Simulations are performed to examine the performance of a vacuum ejector in the hydrogen recovery loop of a 10-kW PEMFC system. The simulations commence by examining the effects of the primary flow fluid pressure and secondary flow temperature on the recirculation ratio and hydrogen stoichiometric ratio. Further simulations are then performed to investigate the temperature, pressure, velocity and Mach number distributions within the ejector for various values of the primary flow inlet pressure and temperature. A prototype ejector is fabricated using a 3D printing technique. Experiments are performed to evaluate the gas tightness and gas recovery performance of the ejector under realistic operating conditions. The simulation results show that the recirculation ratio and hydrogen stoichiometric ratio increase with a decreasing primary flow inlet pressure and secondary flow inlet temperature. As the primary flow inlet pressure increases, the pressure, velocity, and Mach number in the mixing chamber increase, and the hydrogen recovery performance decreases. Furthermore, as the temperature of the primary fluid flow increases, the stability of the isentropic flow condition within the ejector is enhanced. The experimental results show that the prototype vacuum ejector has a maximum gas leakage of just 0.7 psi and a minimum hydrogen recirculation rate of 59.3%. Consequently, it has significant potential for passive hydrogen recovery in large-scale fuel cell systems.

Measurement methods for quantifying powder flowability and velocity in cold spray systems

Four powders with varying bulk densities, Al, Al2O3, Sn, and Cu, were used to determine quantifiable relationships between powder flowability, mass flow rate, and powder velocity with particle morphology and particle distribution in a cold spray system. High particle density results in good powder flowability, specifically when the powders are spherical relative to irregular morphology. Particle velocity during cold spray, measured with a double disk rotary system, increases non-linearly with an increase of inlet pressure. The increase in mass flow rate from the hopper and the resulting mass output of the cold spray system shows a consequence of good powder flowability. Conversely, a high mass flow rate decreases the particle velocity during the cold spray process, with better flowability leading to decreases on the order of 10% in particle velocity in the cold spray system. The described methods, proposed tools, and findings can be easily made with cost-effective and on-the-spot measurements.

Material Extrusion of Helical Shape Memory Polymer Artificial Muscles for Human Space Exploration Apparatus.

Astronauts suffer skeletal muscle atrophy in microgravity and/or zero-gravity environments. Artificial muscle-actuated exoskeletons can aid astronauts in physically strenuous situations to mitigate risk during spaceflight missions. Current artificial muscle fabrication methods are technically challenging to be performed during spaceflight. The objective of this research is to unveil the effects of critical operating conditions on artificial muscle formation and geometry in a newly developed helical fiber extrusion method. It is found that the fiber outer diameter decreases and pitch increases when the printhead temperature increases, inlet pressure increases, or cooling fan speed decreases. Similarly, fiber thickness increases when the cooling fan speed decreases or printhead temperature increases. Extrusion conditions also affect surface morphology and mechanical properties. Particularly, extrusion conditions leading to an increased polymer temperature during extrusion can result in lower surface roughness and increased tensile strength and elastic modulus. The shape memory properties of an extruded fiber are demonstrated in this study to validate the ability of the fiber from shape memory polymer to act as an artificial muscle. The effects of the operating conditions are summarized into a phase diagram for selecting suitable parameters for fabricating helical artificial muscles with controllable geometries and excellent performance in the future.

Thermodynamic performance of a radial-inflow turbine for ocean thermal energy conversion using ammonia

Aiming at the high-efficiency OTEC application, a 30 kW radial-inflow turbine using ammonia was constructed via the one-dimensional design. In addition, a 3D CFD simulation was carried out to research the turbine performance. Furthermore, the effects of blade tip clearance on the flow characteristic in turbine were elucidated and the turbine performance under the off-design conditions was examined. It is indicated that the performance of the designed turbine is satisfactory with a theoretical isentropic efficiency of 85.2% under the design condition. The leakage flow encounters the scraping flow after leaving the tip clearance, forming the vortexes in the cross-section of the flow passage, which decreases the turbine efficiency, and the best ratio of blade tip clearance to inlet blade height is suggested to be 0.04–0.06. When the rotational speeds deviated from the design value, the vortexes appear in the flow passage of the turbine, resulting in non-negligible impact loss of blade and the consequent efficiency reduction. At the design rotational speed, the turbine shows a good adaptability to the inlet temperature variations with the inlet temperature varying from T0 = 296K to T0 = 304K. When the inlet pressure increases, the rotational speed corresponding to the maximum efficiency is also increased.

Research on Surface Quality of 38CrMoAl Polished Based on Abrasive Water Jet

Because the screw surface is slender and complex, it is difficult to process by traditional polishing methods. In order to improve the surface quality of screw, the abrasive water jet polishing (AWJP) technology was used to polish 38CrMoAl steel, which is commonly used in screw. The effects of different inlet pressure, target distance and abrasive particle size on surface roughness are analyzed. The experimental results show that with the increase of inlet pressure, the surface roughness first decreases and then increases. With the increase of target distance, the surface roughness first decreases and then increases. The smaller the abrasive particle size, the better the polishing effect.

Performance analysis of a power generation system for pressure energy recovery at natural gas city gate stations

Worldwide consensus of energy conservation and emissions reduction calls for effective and eco-friendly energy recovery infrastructures in natural gas pipe networks. However, a considerable amount of energy is abandoned by employing pressure regulators in existing city gate stations. In order to recover the exergy and get rid of fossil fuels in the natural gas pressure reduction process, a power generation system for pressure energy recovery at natural gas city gate stations is proposed. Turboexpander is employed to convert the pressure energy into mechanical work, and a carbon dioxide (CO2) cycle is combined to recycle the cold exergy in expanded natural gas. Based on the performance investigation of CO2 cycle, the operation boundary of system with variations of inlet parameters is studied. Furthermore, the system design and off-design performance analysis are also carried out. Results show that system energy efficiency and exergy efficiency reach 42.54% and 88.77% respectively, while the energy recovery rate is 88.11% under design conditions. Under off-design conditions, the system exergy efficiency has a parabolic trend with the optimum value 87.1% under 95% mass flow rate. The increased inlet pressure results in raised exergy efficiency and energy recovery rate, but the curves flatten out when the inlet pressure reaches 105% design value.

Numerical Simulation Study of Hydraulic Fracturing Nozzle Erosion in Deep Well

Hydraulic jet fracturing technology is one of the main means to develop low permeability and deep reservoirs. However, due to the large displacement and high sand ratio in the construction process, the erosion wear of high-speed sand particles on the hydraulic jet fracturing nozzle is more serious, which reduces the erosion cutting ability of the nozzle. Therefore, based on Finnie principle, a three-dimensional model of nozzle is established to analyze the influence of internal multiphase flow field distribution, flow rate, sand diameter and etc. on nozzle erosion. The results show that the erosion velocity increases nonlinearly with the increase of inlet pressure. With the increase of erosion time, the erosion rate gradually tends to be stable; with the increase of fluid viscosity, the erosion rate decreases; with the increase of the diameter and mass flow rate of the erosion particles, the erosion speed also increases, indicating that the size and mass flow rate of the erosion particles are the main factors affecting the erosion effect of the nozzle. The research results have important guiding significance for the rational use of the tool and the extension of the service life of the tool.

Leakage-flow-induced vibration of an elastic plate with steady deformation

In fluid equipment, self-excited vibration may occur in components exposed to gap flow. Furthermore, in the case of a thin plate component for switching the flow path, steady deformation may also occur and change the gap height. The present paper analyzes a leakage-flow-induced vibration on such an elastic plate with steady deformation. The upper surface of the plate is exposed to the inlet pressure, and the lower surface partially faces a gap connecting the inlet and outlet fields. First, an experiment for this thin plate is conducted to observe the change in the gap height and the occurrence of vibration with respect to the inlet pressure. The initial gap height is varied to investigate its effect on the occurrence of vibration. Second, with a view to understanding the mechanism of the vibration occurrence, a theoretical analysis method is presented. The plate deformation is expanded in eigenmodes, and the gap is discretized in the cross direction to apply the theory for one-dimensional gaps. The solution for steady deformation is then subjected to a dynamic stability analysis. In the experiment, the vibration occurs when the inlet pressure is increased and the gap height becomes small, and the vibration disappears before the plate contacts the opposing body and the gap closes. The plate escapes the vibration in cases in which the initial gap height is small. The unsteady pressure obtained by the theory indicates that, as the inlet pressure increases, the phase of the unsteady pressure once experiences the excitation side and reverses to the damping side before the gap closes. In a small initial gap height, the amplitude of the unsteady pressure remains small until the phase reverses, allowing the plate to escape the vibration.

Thermodynamic analysis of supercritical Brayton cycles using CO2-based binary mixtures for solar power tower system application

Supercritical CO2 Brayton cycle has the advantages of high thermoelectric conversion efficiency and compact structure. However, the high ambient temperature in the desert environment would reduce the cycle thermal efficiency. In this paper, three additive gases were mixed with CO2 to reduce the effect of ambient temperature on cycle efficiency. The thermodynamic analysis method based on the optimal split ratio was applied to evaluate the potential of CO2-based binary mixtures in the SPT systems application for the first time. Meanwhile, the impact of critical cycle parameters on system performance was analyzed and the internal connection of the phenomenon was investigated by discussing the exergy loss of each component under typical operating conditions. The results show that the optimal split ratio decreases with the increase of main compressor inlet temperature and turbine inlet pressure. The change of turbine inlet temperature has little effect on the optimal split ratio. CO2-propane has the potential for practical application because the pressure ratio has little effect on the optimal split ratio. Moreover, it is found that the thermal and exergy efficiencies of CO2-propane are increased by 2.34% and 1.51% compared with CO2 under typical operating conditions based on genetic algorithm optimization.

Experimental Study on the Pressure Transfer Mechanism of Embedded Magnetic Fluid Seals

Although the sealing mechanism of the embedded magnetic fluid seal is unclear, it is an effective way to improve the performance of the ordinary magnetic fluid seal. Embedded magnetic seals can be divided into diverging and converging embedded magnetic fluid seals, according to the direction of leakage of the sealed medium. This article mainly focuses on presenting a sealing device that can observe the change in the shape of the magnetic fluid film and investigate the mechanism of diverging and converging embedded magnetic fluid seals. The pressure transfer mechanism of the embedded magnetic fluid seal with a large gap was studied through experiments. Numerical analysis of the magnetic field distribution in the seal gap and calculation of the theoretical pressure capacity of the embedded magnetic fluid seal are produced on the basis of embedded magnetic fluid seal theory. The experimental pressure capacity is compared with the theoretical pressure capacity to verify the correctness of the embedded magnetic fluid seal pressure capacity theory. The research has investigated the effect of the number of magnetic fluid film ruptures on the self-restoring capacity of embedded magnetic fluid seals, compared with the self-restoring capacity of diverging and converging embedded magnetic fluid seals, and analyzed the data. The results illustrated that the experimental pressure capacity of the embedded magnetic fluid seal matched well with the theoretical pressure capacity, which verifies the correctness of the embedded magnetic fluid seal theory. The pressure transfers from one chamber to another when the pressure difference between the two sides of the magnetic fluid film under the pole tooth is larger than the pressure capacity of the magnetic fluid seal, and the air will enter from the high-pressure side seal chamber to the low-pressure side seal chamber, in turn. As the inlet pressure increases, the pressure trend in the radial chamber of the embedded magnetic fluid seal differs from that in the axial chamber. When the seal fails, the magnetic fluid shows microleakage and complete leakage. As the number of magnetic fluid film ruptures increases, the self-restoring capacity first decreases and then increases. The self-restoring capacity of the converging embedded magnetic fluid seals is better than that of the diverging embedded magnetic fluid seals.

Effect of Inlet Condition on the Performance Curve of a 10 MW Supercritical Carbon Dioxide Centrifugal Compressor

The influence of inlet condition upon the performance and stability for a 10 MW supercritical carbon dioxide centrifugal compressor is investigated using the computational fluid dynamics method. The inlet conditions which are considered are as follows, a constant inlet pressure of 8.0 MPa with varying inlet temperatures of 308.15 K, 308 K, 306 K, and 304 K, and a fixed inlet temperature of 308.15 K with different inlet pressures of 7.5 MPa, 8.0 MPa and 8.5 MPa. The numerical method with the k-omega based shear-stress-transport turbulence model is validated compared to the published experimental data. The numerical result shows that a small variation of temperature or pressure significantly has huge impact on the compressor performance operating near the critical point of supercritical carbon dioxide. As the compressor inlet pressure increases, the compression factor of the working fluid becomes lower, resulting in an enlargement of the pressure ratio. However, the decrease in inlet temperature leads to a higher compression factor of the working fluid and a reduced pressure ratio. The variation of the isentropic efficiency curve is mainly attributed to the change in the compressor inlet volumetric flow rate. The locations of the stall point and choke point are dependent on the values of inlet pressure and temperature.

Investigation on the fluctuation characteristics and its influence on impact force of supercritical carbon dioxide jet

Supercritical carbon dioxide (CO2) jet-assisted drilling is considered a promising technology in unconventional natural gas drilling engineering. The flow field characteristics of the supercritical CO2 jet are the critical factors that affect the erosion performance of the jet. The relation between the flow fluctuation characteristics and the jet is required further investigation to enhance its erosion performance. In this study, the fluctuation features of a supercritical CO2 jet were simulated based on a modified real gas model. Subsequently, impact force tests were conducted using an I-Scan flexible array pressure sensor to obtain peak pressures at different standoff distances. The results indicated that the flow field structure of the supercritical CO2 jet exhibits typical compressible wave-like features, which can be accurately determined by the expansion ratio. The expansion ratio was mainly affected by the inlet pressure, inlet temperature, and ambient pressure. The static pressure, temperature, and velocity distributions of a free jet could be significantly influenced by the fluctuation characteristics. Among them, the static pressure and temperature trend decrease in the expansion waves and increase in the compression waves, while the velocity shows a contrary variation trend. When the jet was under-expansion, the lengths of the wave node and jet potential core increased with increasing inlet pressure and decreased with increasing inlet temperature and ambient pressure. Moreover, the fluctuation characteristics of the flow field significantly affected the peak impact force of the supercritical CO2 jet. The peak impact force at the compression wave positions tended to be higher than that at the adjacent expansion wave positions. The maximum pressure difference of jet impact was 7.39 MPa in this study, which occurred when the standoff distance was 23.0 and 17.3 mm and accounts for 18.6% of the impact pressure at 23.0 mm. A plate shock wave was observed ahead of the target when the standoff distance was larger than 23.0 mm, which accounted for the abrupt decrease in pressure at the stagnation region.

Numerical Analysis of a Small Pneumatic Hammer Performance Based on Evaluation Method of Friction Force

Mechanical power loss in pneumatic hammers comes from the friction between parts in relative motion, and wear is among the failure mechanisms of the top hammer. Therefore, it is important for high performance and a longer service life of pneumatic hammers to reduce the friction force between parts in relative motion. This study presented a novel approach to quantitatively determine the friction force and consider it in the simulation model of pneumatic hammer. First, the friction force between piston and cylinder in a small pneumatic hammer was measured using an experimental setup at different inlet pressures. We could find from the experimental result that the friction force was about 0.8 N under the horizontal installation when there was no pressure supply, but it increased significantly, was 20 times greater than that without pressure supply, due to aerodynamic action by compressed air leaked from the annular gaps between the cylindrical matching surfaces of the components. In addition, it increased from 10.27 to 16.7 N due to an increase in inlet pressure and mechanical power loss in the pneumatic hammer that was about 10% of impact energy. Then, numerical analysis for a small pneumatic hammer performance was performed by a model considered the friction force using AMESim software. Finally, it can be seen from the simulation results that the proposed approach could significantly reduce the error between the simulated and the measured values for the impact energy because of ignoring the friction force. This approach will be used to predict service life of piston and find a low friction piston of pneumatic hammer in practical engineering.

Research on Seepage Characteristics of Y-Shaped Fractures under Different Fracture Roughness

Fractures are widely distributed in coal, and studying the seepage characteristics of fluids in fractures is of great significance for unconventional natural gas extraction and prevention of gas disasters. In this work, based on the W-M fractal function, a Y-shaped fracture model with different roughness is established. The seepage characteristics of Y-shaped fracture with different roughness are interpreted from two perspectives. Firstly, the seepage law of the Y-shaped fracture with the same roughness is studied. Secondly, the fluid competitive diversion capacity caused by the difference of branch fracture roughness is discussed. The results show that the fracture roughness is an important factor affecting the seepage characteristics of the fracture. When the roughness of the fracture is identical, the outlet flow rate, velocity, and Re are all positively correlated with pressure, and the flow regime is unchanged. The increase in the fracture roughness will lead to a significant flow rate and momentum loss, resulting in maximum loss up to 45.44%, besides, enhance the flow resistance of the fracture, Re increasing by 771, 713, 489, and 355, respectively, at four patterns. And there is a threshold DM between 1.1 and 1.2 so that the major influencing factor on hydraulic conductivity changes. In addition, the roughness difference between the branch fractures of the Y-shaped fracture is the key factor to control the fluid competitive diversion capacity. The larger the roughness difference, the greater difference in flow velocity, and the more significant change in flow rate proportion, which proportion differs by 4%, 44%, and 54%, respectively, and the stronger smooth branch fracture competitive diversion capacity, and the lower the rough branch fracture hydraulic conductivity. As the inlet pressure increases, the two branch fractures Re gradually increases but Eu decreases, which Eu in smooth branch fracture is smaller is 15, 19, 20, and 21 smaller than that of rough branch, respectively, and the rough branch fracture competitive diversion capacity is weakened. Both roughness difference and inlet pressure will affect the competitive diversion capacity of the Y-shaped fracture. These results are expected to provide new insights for the exploitation of underground fluid resources.

Numerical Simulation and Experimentation of Atomization Field of Fan-Shaped Atomization Nozzle for UAV

Background: Due to the influence of external wind speed and their flight speed, the droplets sprayed by the plant protection Unmanned Aerial Vehicles (UAV) have serious drift and volatilization. Objective: The aim was to study the atomization characteristics of the fan-shaped atomizing nozzle of UAV under different inlet pressures and in different internal cavity diameters. Methods: Firstly, the Realizable k-ε turbulence model, DPM discrete phase model, and TAB breakup model are used to make a numerical simulation of the spray process of the nozzle. Then, the SIMPLE algorithm is used to obtain the droplet size distribution diagram of the nozzle atomization field. At last, the related test methods are used to study its atomization performance and the changes of atomization angle and droplet velocity under different inlet pressures and in different internal cavity diameters; the distribution of droplet size is also discussed. Results: The research results show that when the diameter of the internal cavity is the same, as the inlet pressure increases, the spray cone angle of the nozzle and the droplet velocity at the same distance from the nozzle increase. As the distance from the nozzle increases, the droplet velocity decreases gradually, the droplet size distribution moves to the direction of small diameter, and the droplets in the anti-drift droplet size area increase. Under the same inlet pressure, as the diameter of the internal cavity increases, the spray cone angle first increases and then decreases, and the droplet velocity at the same distance from the nozzle increases. As the distance from the nozzle increases, the droplet velocity decreases gradually, the droplet size distribution moves to the direction of large diameter, and the size of the large droplets increases, thereby, not meeting the condition of anti-drift volatilization effect. Conclusion: Under the parameters set in this study, i.e., when the inlet pressure was 0.6 MPa, and the internal cavity diameter was 2 mm, the best atomization result was obtained.