Outlet Angle Research Articles

A novel design of impeller cavity pre-swirl system for efficient supercharging and low power consumption

Abstract A design for a turbine pre-swirl system with impeller cavity is proposed to improve the quality of cooling air supplied to the turbine blades of an aeroengine. Impeller cavity is analyzed in order to increase the system pressure ratio with a low system power consumption at the system outlet. Theoretical and numerical investigation are used to investigate the flow characteristics in an impeller cavity pre-swirl system. The conclusions in this study indicate that the impeller structure can increases the pressure ratio by changing the power consumption and distribution of the absolute velocity in the impeller cavity and system outlet. To obtain high pressure ratio and low power consumption, the impeller should have a structure with a high outlet installation radius and low outlet angle. The highest increase in the pressure ratio compared with the empty cavity pre-swirl system is 6.4% and the corresponding increase in the power consumption is 2620 W.

The influence of splitter blades and meridional profiles on the performance of small-scale turbopumps for ORC applications; analysis, neural network modeling and optimization

This work presents the influence of splitters on the performance of small-scale turbopumps for organic Rankine cycle applications numerically. Different design parameters, such as impeller diameter at the outlet, number of blades, blade angle at the trailing edge, and the length and location of the splitter blades, are studied for both shrouded and unshrouded impellers at tip clearance ratios of 0.05 and 0.10 (relative to blade height). The results suggest that splitter blades can increase impeller head coefficient and slip factors up to 10%–24% depending on the blade outlet angle. At the same time, the total efficiency is not influenced significantly. The CFD calculations predict that the placement of splitters in the middle of the blade channel leads to the maximum head coefficient for shrouded impellers. In contrast, for the tip clearance ratio of 0.10, a higher head coefficient is observed for placement closer to the suction side of the main blade. After that, different meridional profiles are studied to investigate their influence on the performance characteristics and mitigation of tip clearance effects. Profiles with a sharper change of cross-section area at the inlet rather than a linear change are found more advantageous, as higher head rise, total efficiency, and static efficiency are observed. In the end, the splitter blade profiles are optimized through techniques of design of experiments, leading to a 2.43% improvement in total efficiency. In contrast, the head rise remains constant, and static efficiency decreases by 0.49% for an impeller with a tip clearance ratio of 0.05.

Determination of Optimum Outlet Slit Thickness and Outlet Angle for the Bladeless Fan Using the CFD Approach

Bladeless fans are more energy efficient, safer due to the hidden blades, easier to clean, and more adjustable than conventional fans. This paper investigates the influence of the airfoil’s outlet slit thickness on the discharge ratio by varying the outlet slit thickness of an Eppler 473 airfoil from 1.2 mm to 2 mm in intervals of 0.2 mm by using a k-omega SST turbulence model with an all y+ wall treatment used to numerically simulate in CFD. The computational results indicated that smaller slits showed higher discharge ratios. The airfoil with a 1.2 mm slit thickness showed a discharge ratio of 18.78, a 24% increase from the discharge ratio of the 2 mm slit. The effect of outlet angle on the pressure drop across the airfoil was also studied. Outlet angles were varied from 16° to 26° by an interval of 2°. The airfoil profile with a 24° outlet angle showed a maximum pressure difference of 965 Pa between the slit and leading edge. In contrast, the 16° outlet angle showed the least pressure difference of 355 Pa. Parameters such as average velocity (U), turbulent kinetic energy, the standard deviation of velocity, and outlet velocity magnitude are used to assess the performance of airfoil profiles used in bladeless fan.

Experimental Study on Combustion Optimization of Supercritical 600MW Quadrangle Tangential Boiler

Given the problems existing in the operation of supercritical 600MW boiler, such as spiral pipe water cooling wall outlet, superheater and reheater wall surface overtemperature easily, the superheater and reheater cooling water amount are too large under high load, and the low load cooling water amount is too small to meet the need of cold reheater heating, the boiler combustion optimization and adjustment are carried out. Through the boiler pulverized coal fineness, air distribution characteristics, swinging Angle of burner and furnace outlet is optimized, such as oxygen level superheater heating surface overtemperature problems are solved, such as the reheater desuperheating water flow under different load can meet the needs of heat supply, at the same time, it also improves the boiler efficiency, effectively improve the safety and economy of the unit.

Study on the Effect of Pressurized Air Supply Outlet Setting on the Effect of Anteroom Smoke Control

In the selection of smoke control system, the Technical standard for smoke management systems in buildings (GB51251-2017), Article 3.1.1, paragraph 2, makes strict requirements for the setting of mechanical pressurized air supply outlets in anterooms, in order to study the influence of different setting methods of supply outlets on the smoke control effect of anterooms, the wind speed of the anteroom doorway section and the smoke flow in the anteroom are researched for different settings of the location of outlet and air supply angle with the help of Pyrosim. The results show that the effect of anteroom smoke control is not only related to the wind speed of the doorway section, but also related to the air velocity distribution at each point of the doorway section; at the same time, the air supply angle also has some influence on it.

Impact of Slots on the Aerodynamic Performance of the Variable Inlet Guide Vane Cascade of a Centrifugal Compressor

This study reconstructed the flow field of a symmetrical variable inlet guide vane in a centrifugal compressor through the passive control method of vane slots. Based on the high-fidelity numerical simulation model verified by experiments, the influence of different slot forms on the flow field was investigated, and the passive control mechanism was revealed. The results demonstrated that the vane slot method can effectively suppress the suction surface separation and broaden the range of low-loss incidence angles. Overall, the 50_30 slotted vane achieves the best flow field control, with a 65.6% reduction in the total pressure loss coefficient and a 2.3° reduction in the deviation angle, respectively, at a 25° incidence angle. The linear characteristics of the pre-swirl grade variation curve with variable inlet guide vane incidence angles are also improved. Furthermore, changing the slot outlet angle has the most significant influence on the aerodynamic performance as it changes the throat width of the location, thereby affecting the flow rate and momentum of the jet. Finally, the impact of the velocity varies in the first self-similarity region on the slotted vane. The results indicate that, in contrast to the baseline vane, the suppression effect of the slot jet on the flow separation improves with the inlet velocity, whereas the deviation angle of the slotted vane declines with the inlet velocity. Meanwhile, the higher the incoming flow velocity, the better the slotted jet can inhibition of flow separation.

Study on the thrust fluctuation and vortices of a pump-jet propulsor under different duct parameters

Improving underwater propulsor performance is endlessly pursued, not only the propulsion but the vibration and radiated noise. The latter is highly related to the unsteady characteristics of forces and flow. This paper investigates the effects of duct parameters on the thrust fluctuation and flow features of a pre-swirl stator pump-jet propulsor (PJP) via embedded large eddy simulation (ELES). The duct parameters include inclination angle, tip clearance, axial length, maximum thickness, and diameters of duct inlet and duct outlet. The numerical approach is verified with experiments, showing good precision. The performance is first discussed, followed by the thrust fluctuation analysis to reveal the varying law of the thrust fluctuation level with duct parameters. Then, the velocity and pressure around the duct are presented to inspect the causes of differences in performance and thrust fluctuation. Finally, the vortices in the flow field are identified and considered the vortex evolution of the tip clearance vortex for inspecting the instability mechanism under different ducts. Results show that the duct parameters significantly affect the performance and thrust fluctuation. The instability mechanism of the tip clearance vortex also presents notable differences. Overall, the study should be helpful in the duct design and reduce thrust fluctuation, and will eventually benefit low-noise pump-jet design.

Effect of Different Explosion Relief Outlet Angles on Explosion Relief Efficiency in Confined Areas

ABSTRACT In this paper, we study the effect of explosion pressure relief from different angles of outlet in confined areas under methane-air premixed gas with a methane volume concentration of 9.5%. Results showed that increasing the angle of explosion pressure relief outlet from 30° to 150° generates a subsequent change in the overpressure attenuation rate of the straight pipeline segment (range 19.51–33.96%). Notably, the explosion pressure relief efficiency is most significant under working conditions of 60°–75°, and the overpressure attenuation rate is 30.21%–33.96%. The overpressure attenuation rate of the straight pipeline exhibits a non-monotonic relationship with the explosion pressure relief outlet angles, while the overpressure peak is positively correlated with the explosion pressure relief outlet angle. Collectively, these results provide a theoretical basis to guide future designing of explosion pressure relief outlet angles in a restricted space.

MODELLING STUDIES USING CORROSIVE AND NON-CORROSIVE MATERIALS TO IMPROVE ON RELIABILITY AND EFFICIENCY OF AN IMPELLER OF A CENTRIFUGAL PUMP.

The quest to improve on the reliability, operability, sustainability of centrifugal pumps in all facets of process operations which includes; oil and gas industries across the globe have a pivoted role to play in the development of world energy technology and sustainability in numerous ways. This is because several operability challenges and malfunctioning of centrifugal pumps can usually results to unexpected shutdown of process operations and mostly in cases with faulty standbys. Several researches have been conducted using experiment and numerical simulations to design the centrifugal pump impellers. As a result of recent research, the performance of contemporary centrifugal pump impellers yielded positive results. However, for sustainability there is a need to design the impellers using corrosive and non-corrosive materials to improve on its reliability and efficiency of the pump impeller is one of the key design parameters of the centrifugal pump, which has an important influence on the internal flow field and performance of centrifugal pump. In this paper, impeller models with different blade inlet and outlet angles (350 - 47°, 380 - 50°, and 410 - 53°) were designed via vista CPD under the basis of impeller parameters used, and numerical simulation was carried out in the commercial software ANSYS-CFX. Then the experiment was performed on three processes, that is, pre-processing, the solver and post-processing using corrosive fluids (Saline water, hydrochloric acid, methanol) and non-corrosive fluids (water at 1000C, gasoline, kerosene) to improve on reliability and efficiency of the impeller of centrifugal pump. The results of the pressure of impeller inlet first decreases and then increases, and the change trend of pressure distribution is consistent under different inlet and outlet angles and different corrosive and non-corrosive fluids. It can be seen that the relative velocity of the fluid in the impeller increases gradually, and the velocity has minimum value and smaller gradient in uniform flow at the impeller inlet. The performance of the impeller was simulated to improve is the reliability and efficiency for corrosive and non-corrosive fluids with different mass flowrate and head rise of 55m and various efficiency ranging from 67.55% to 94.21%. To verify the numerical result and analysis, the performance test apparatus for the centrifugal pumps was designed and built for further researches, and all the research results could provide appropriate reference for designers to select reasonable outlet angle. Keywords: Oil and gas, centrifugal pump, reliability, sustainability

Topology optimization of micro-channel reactors using an improved multi-objective algorithm

This study proposes an improved multi-objective density-based topology optimization (TO) model for Newtonian and non-Newtonian fluid micro-channel reactor(NMCR, nNMCR) to substantially improve the overall performance of MCR. Flow, catalytic reaction, and heat transfer in MCR under constant pressure driving is described by built a multi-physics model of continuous-flow exothermic reaction. TO adopts the material density as the design variable to control the changes in fluid and solid domains. The artificial Darcy friction improved by polynomial function is used to add the impermeability of intermediate density, and the Helmholtz partial differential filter and hyperbolic tangent projection are applied to eliminate the checkerboard phenomenon and structural ill-conditioning. The improved multi-objective algorithm based on the weighted-sum method and pseudo-design domain concept are proposed to avoid the local topological structure simplification and unreasonable. In examples, the effects of reactor geometries and outlet angles θ on optimal configurations and performance parameters of NMCR and nNMCR are investigated. Additionally, optimal solution set under multi-objective functions with different weight factors ω1 is solved, and Pareto frontier is established accordingly to reveal the trade-off relationship between the single-objectives. MCR responds to the proportion increase of flow single-objective in multi-objective function by homogenizing the local catalyst blocks distribution and increasing the flow channel length, thereby affecting the flow, diffusion and mixing. The local catalyst distributions of NMCR and nNMCR are significantly different due to different fluid properties. From the perspective of engineering, this study provides an efficient and applicable optimization method for designing MCR with higher comprehensive performance.

Performance improvement of forward-curved impeller with an adequate outlet swirl using in centrifugal pump as turbine

Pump as turbine (PAT) is a type of economical energy recovery device that is widely used in micro-hydropower plants and energy recovery. A special impeller with forward-curved blades can dramatically improve the PAT's performance relative to an original impeller with backward-curved blades because the inlet angle created by the former more effectively matches volute outlet flow. The blade outlet angle is another important factor in energy conversion. To investigate the effects of blade outlet angle on the performance of a special impeller, four outlet velocity moments were chosen according to the same inlet velocity moment value vu1r1 (0.02vu1r1, 0, −0.02vu1r1, -0.04vu1r1, were used). Four special impellers with different blade outlet angles were modeled and simulated via verified computational fluid dynamics. The results show that, the highest efficiency among PATs at −0.02vu1r1 was higher than that at 0.02vu1r1 by 1.46%. A suitable negative outlet velocity moment also helps eliminate swirl at the impeller outlet caused by the asymmetric inlet velocity moment and helps reduce the formation of vortex in the draft tube. This further decreases hydraulic loss and improves the operating stability of PAT. This paper presents a method for determining the blade outlet angle of the special impeller of PAT.

Effect of inlet and outlet angles on the flow performance of the ferrofluidic magnetic micropump

Effect of inlet and outlet angles on the flow performance of the ferrofluidic magnetic micropump

CFD Simulation of Circulating-Airflow Distribution Inside Canopy From Novel Air-Assisted Sprayer in Orchard

HIGHLIGHTS A CFD model was developed to simulate airflow movements from circulating air-assisted sprayer. The CFD model can simulate airflow distribution inside the pear canopy with good accuracy. Simulation identifies the preferred parameters for circulating air-assisted spraying. An excessive adjustment of the airflow angle resulted in the formation of an eddy. ABSTRACT. Circulating air-assisted (CAA) spraying involves a negative pressure suction (NPS) created by a fan placed over the top of a canopy to change the airflow direction twice, i.e., first from the outside of the canopy to its inside and then from the bottom up, which can increase the airflow velocity inside the canopy. However, this new pesticide application technology has not been adequately investigated. In particular, the effects of the inlet and outlet airflow parameters of CAA spraying technology on the airflow distribution inside a canopy are yet to be determined. In this study, a computational fluid dynamics (CFD) model is developed and validated to simulate the interactions between the airflow ejected by a CAA sprayer and the canopy of a fruit tree. In the computational domain, the fruit tree is considered a porous medium. The model is validated based on three fruit trees of different sizes, leaf-area densities (LAD). The root mean square error and the mean relative square error are 1.44, 1.43, 2.22 m/s, and 24.9%, 24.7%, and 36.4%, respectively. This suggests that the CFD model can predict the interactions between the airflow field generated by a CAA sprayer and the canopy of a fruit tree. The validated CFD model is employed to analyze the airflow distribution patterns inside a canopy under different combinations of inlet and outlet airflow parameters. A reasonable combination of inlet and airflow parameters is obtained for CAA spraying technology. For example, the suitable outlet airflow velocity, top NPS, and bottom outlet angle for seven-year-old crown pear trees (average height: 2.0 m; average canopy diameter: 1.2 m; average trunk height: 0.62 m; average LAD: 2.96) selected in this study from a farm in southern China are 15 m/s, 200 Pa, and 10°, respectively. The results of this study can facilitate the parametric adjustment of CAA sprayers and enhance plant protection in orchards. Keywords: Circulating air-assisted spraying, Fruit-tree canopy, Inlet and outlet airflow parameters, Simulation.

Energy parameters assessment, under scale effect calculation of centrifugal fans with radial blades

The centrifugal fans with radial blades are used in various industrial energy systems, associated with high dustiness, due to their self-cleaning ability and their reliable operation. Radial fans are used in cement, asphalt industries and various dust collection facilities. The uniqueness of the different working environment and the specifics of each system require the use of a fan, designed for the particular application. Due to the dimensions of the machines, before the fan is produced, it normally goes through model tests. In model studies of rotodynamic fluid machines, differences are sought between the expected parameters from the application of the similarity theory and the obtained energy parameters. These differences are commonly referred to as the scale effect. Estimating the scale effect in model tests leads to the use of energy efficient machines for a given system. These are the one, that give the desired system parameters when operating in the region of maximum efficiency. Thus, the purpose of modeling is to transfer the efficiency obtained for a given mode of operation of the model machine to the prototype. The operation in the optimal mode of the prototype fan leads to energy savings and a reduction in energy costs for a given technological system. In the presented paper are evaluated the differences between expected and obtained parameters that help to realize a model for a centrifugal fan with radial blades. The results of model tests, conducted on two geometrically similar centrifugal fans with radial blades, where the inlet and outlet angles of the impeller are the same (β1=β2=900 ), are given. The fan impellers are semi-open type with 12 blades. Each of the impellers is tested in a geometrically similar helical chamber. Model tests have been conducted on a laboratory test-bench, meeting the requirements of AMCA 210 or ISO5801. The test-bench is equipped with the complete measuring equipment, according to the standards used. During the model tests, both the energy parameters of the fans and the parameters of the surrounding environment are measured. The results of the energy tests of the fans are given in the paper, as well as the coefficients concerning the scale effect are determined and analyzed.

Analyses of the Design of Multirows Vaneless Staggered Counter-Rotating Turbine

Compared with a conventional turbine, counter rotating turbine has larger thrust weight ratio, shorter axial distance, and higher efficiency. It has been widely used in high-performance aviation. In conventional counter-rotating turbine, HPT is located in the front of LPT, and only a stator row can be eliminated. The layout limits the turbine weight and efficiency. Therefore, the staggered counter rotating turbine is proposed, and the staggered counter rotating turbine can eliminate the all-internal stators, which can greatly improve the turbine weight and efficiency. The staggered counter rotating turbine is the development and improvement of counter rotating turbine. Due to the elimination of the all-internal stators, the downstream rotor will suffer from the insufficient inlet swirl, which is the main question in staggered counter rotating turbine design. Furthermore, the turbine outlet angle is also an important parameter to evaluate the turbine design. The coordination of inlet swirl and outlet Mach number and the outlet angle is discussed by the theoretical method. In order to verify the design method, two-dimensional throughflow design, blade design, and three-dimensional numerical analysis are performed. Expansion ratios and efficiency at the speed combinations of the 80% to 105% are discussed to reveal the turbine characteristics at off-design conditions. An adiabatic total-to-total efficiency of 92.1% with expansion ratio of 4.47 at design point is obtained and achieves the initial design goal very well. The paper is aimed at providing a technical approach to improve the thrust weight ratio, efficiency of high bypass turbofan engines, and provide new ideas for the development of aeroengines.

Entropy production analysis of a radial inflow turbine with variable inlet guide vane for ORC application

The fluctuation of heat source conditions leads to the off-design operation and efficiency reduction of the radial inflow turbine (RIT). The adjustment of the outlet angle of inlet guide vane (IGV) is an important way to improve the turbine performance under off-design conditions. Since the energy dissipation caused by friction and flow separation is the main reason for the reduction of RIT efficiency, the entropy production analysis method is used to diagnose the location with high local energy loss in the RIT and evaluate its total energy loss under different working conditions in this paper. Firstly, an appropriate outlet angle of the IGV is determined according to the inlet pressure and outlet pressure of the RIT in organic Rankine cycle (ORC). Then, the effects of inlet pressure and outlet pressure on its energy loss are studied. The results indicate that the average entropy production rate (EPR) of the rotor in the RIT is the highest, which is mainly from the tip clearance and the inlet region. More than 70% of total entropy production of the turbine comes from the rotor, followed by the diffuser. The turbine can achieve lower total entropy production at higher outlet pressure or lower inlet pressure. Compared with a fixed IGV, the turbine with variable IGV can achieve higher turbine efficiency and output power under off-design conditions. The maximum increase in the efficiency and output power of the turbine with variable IGV under different inlet pressures is 3.8% and 12.9%, respectively.

Volute Optimization Based on Self-Adaption Kriging Surrogate Model

Optimizing the volute performance can effectively improve the efficiency of a centrifugal fan by changing the volute geometric parameter, so the self-adaption Kriging surrogate model is used to optimize the volute geometric parameter. Firstly, volute radius Rd, the radius of tongue r, and outlet angle of the volute θ are selected as the optimization parameters of the volute, and latin hypercube sampling is used to configure the initial sample points, the corresponding three-dimensional aerodynamic model under each sample point configuration is constructed. CFD software is used to simulate the aerodynamic efficiency and total pressure of the centrifugal fan under each initial sample point configuration. Secondly, the Kriging surrogate model of initial sample point configuration parameters, aerodynamic efficiency, and total pressure of volute is constructed, and sample points are added by expectation improvement (EI) method to improve the fitting accuracy of Kriging surrogate model. Finally, the high-precision Kriging surrogate model is used as the fitness function of NSGA-II algorithm to find the Pareto optimal solution under multiobjective optimization, and the optimization target are aero dynamical efficiency and total pressure. The rationality of the above method is verified by optimizing the 9–19.4A type centrifugal fan volute. The efficiency of the optimized fan under working conditions is increased by 1%, and the total pressure under working conditions is not reduced. The optimized volute can effectively improve the overall performance of the centrifugal fan. This study is helpful to promote the application of numerical optimization design method in the volute of centrifugal fan. It provides reference for the optimization design of high-performance centrifugal fan.

Effects of Blade Suction Side Modification on Internal Flow Characteristics and Hydraulic Performance in a PIV Experimental Centrifugal Pump

In this paper, the effects of blade trailing edge (TE) profile modification of the suction side on the internal flow and hydraulic performance in a low-specific speed centrifugal pump are investigated through particle image velocimetry (PIV) analysis. Three impellers with different blade trailing edge profiles named original trailing edge (OTE), arc trailing edge 1 (ATE1), and arc trailing edge 2 (ATE2) are designed for PIV experiments. Results show that blade trailing edge modification of the suction side can significantly change the flow pattern, affecting the hydraulic performance of the model pumps. There is a definite counterclockwise backflow vortex near the suction side of OTE at deep-low flow rate, resulting in a decrease in the uniformity of the flow field at the outlet and the hydraulic performance. ATE1 with a reasonable larger blade outlet angle has the best flow field, and the head and efficiency are increased by about 1.2% and 8%, respectively under the same working condition. The hydraulic performance of ATE2 with the blade outlet angle of 59° is better than that of OTE under low flow rate, but it is less than that of OTE under high flow rate due to the streamline deviation generated on the pressure side. Meanwhile, the energy conversion abilities of the modified model pumps are evaluated by slip factor and the deviation degree of the nominalized local Euler head distribution (NLEHD). Since there is no definite counterclockwise backflow vortex at the outlet after modification, the slip factor of ATEs increases and the energy conversion ability is enhanced. Moreover, the jet-wake phenomenon of ATEs is weakened, and the local Euler head (LEH) increases near the outlet, decreasing the deviation degree of the NLEHD to obtain better energy conversion ability.

Analysis and modeling of the tip leakage flow on the performance of small-scale turbopumps for ORC applications

• An automated design model is developed to generate impeller geometries suitable for organic Rankine cycles. • The influence of tip clearance is investigated and modeled. • At high blade outlet angles, the effects of tip clearance and flow rate on the slip factor diminish. • The head rise decreases with the tip clearance ratio. • Feedforward neural networks are trained to model the slip factor and head loss coefficient of unshrouded centrifugal pumps. In this paper, the influence of tip clearance on the performance of small-scale turbopumps is studied numerically on extensive parameter ranges suitable for organic Rankine cycle applications. A novel and fully parameterized design model is developed and used to generate a wide range of turbopumps and their fluid domains to carry out three-dimensional computations across the impeller stage. Impellers are investigated at different operating conditions, and the accomplished results are analyzed to characterize the performance at design and off-design conditions. The CFD calculations demonstrate that the slip factor is dependent not only on its geometrical parameters, as considered by most correlations, but also on its operating conditions. The slip factor decreased almost linearly as the flow rate increased. In addition, the tip clearance ratio influences the slip factor, and its influence is non-linear. The head rise decreases as the tip clearance ratios increase. However, for radial impellers, a higher head rise was observed for small tip clearance ratios (<0.10). The numerical data is employed to infer reduced-order models for considering the tip clearance effect in the early-phase design process of small-scale turbopumps. The models predict the CFD data with an average relative deviation of 3.6 % and 5.8 % for the slip factor and the head loss coefficient, respectively.

Optimization of energy recovery turbine in demineralized water treatment system of power station by Box–Behnken Design method

In order to improve the recovery efficiency of the energy recovery turbine in the demineralized water treatment system of the power station, the Box–Behnken Design (BBD) response surface method combined with CFX numerical simulation were used to calculate the outlet angle of the turbine impeller blade(β1),blade inlet angle(β2), blade thickness(h), which were selected as the three factors of BBD test design, and head H and efficiency η were two evaluation indexes, the design-exper10 software is used to test and analyze the test results, then the whole flow field of the optimized turbine model was analyzed with CFX numerical simulation. The results show that when the β1 and β2 are 24.6° and 22.4° respectively, and h is 3.8 mm, the turbine has the optimal hydraulic performance. The efficiency of the optimized turbine model is increased by 1.8% and the head is increased by 21 m under rated working conditions. The research may provide a good basis for the energy-saving transformation of demineralized water treatment system in power station.