Simulation Of Internal Flow Field Research Articles

Study on Internal Flow Field of Series Pulsed Nozzle

This paper describes experimental study and numerical simulation of series pulsed nozzle. The simulation of internal flow field in nozzle with different cavity length was carried out by using CFD. The influence of chamber length on the velocity distribution and the axial velocity was analyzed. The simulation results indicate that there is a optimum rang of cavity length producing the maximum outlet velocity. The dynamic pressure of pulsed jet was also studied by using SD150 test system. The effect law of chamber length on the impact pressure of pulsed jet was analyzed. The experimental results show that the peak of hitting power reaches the maximum within a certain range of cavity length. Simulation results are in agreement with Experimental results.

Numerical Simulation of Internal Flow Field on Diesel Centrifugal Gas-Oil Separator Based on CFD

Aiming at the low efficiency problem of the traditional gas-oil separator, this paper put forward a centrifugal gas-oil separator. In order to identify out the interior fluid field character of centrifugal gas-oil separator, RANS equation, RNG k-ε model and discrete phase model was applied to simulate the interior fluid field character and separation efficiency of centrifugal gas-oil separator. The simulation results showed that the flow field in the disc clearance was mainly laminar flow, and the flow field at the import and export of the disc was turbulence. Meanwhile, the velocity and pressure of the interior fluid field were equably distributed, the velocity and pressure in the disc clearance fluctuate in a tight range along vertical direction, and decrease along horizontal direction, and the particles in the disc clearance were distributed uniformly. The separation efficiency was 96.6% and the results met the design requirements.

Research on the Characteristics of Bearing behavior of the Profiled Throttling Cavity Air Bearing

The finite volume method was used to study three freedom special throttling cavity characteristics. Based on the internal flow field simulation of three degrees of freedom the profiled throttling cavity air bearing analysis of bearing, analyzed effective of rotating speed and gas pressure on the air bearing characteristics and the different carrying capacity between profiled and conventional structure of air bearing is compared. The results show that, with three degrees of freedom profiled throttling cavity a characteristics have a nonlinear relationship with gas pressure and rotating speed, in order to make the bearing capacity in the optimal value, it should make supply pressure and bearing speed to be limited; special-shaped throttling cavity structure, compared with the conventional throttling cavity structure, at the same condition, the carrying capacity has a larger increase, profiled throttling cavity air bearing has more excellent bearing capacity.

Experimental study and numerical simulation of the solid-phase particles' influence on outside characteristics of slurry pump

At present solid-liquid two-phase flow pump faces two big problems: the low efficiency, the short life, then the concentration of the conveyed solid-phase media are the important factors which affect the outside characteristics about this two phase flow pump. This article presents the outside characteristics' experimental research and internal flow field's simulation analysis on AH type slurry pump which is product by Shijiazhuang Shi- Jiang pump industry, discusses the flow rule in the impeller, and summaries the influence of the solid phased particles' concentration on the performance of the slurry pump's outside characteristics. At last, the rationality and accuracy of the numerical calculation method are verified through the way of comparing numerical simulation with experimental results in this two phase flow pump. And the relation between slurry pump's outside characteristics and granule concentration is summarized, which provided theoretical guidance for the slurry pump's optimization design and selection.

The Numerical Simulation of Internal Flow Field in Rotor Oil Pump

Numerical simulation of rotor oil pump is completed by using SC/Tetra under variable conditions, which obtains the distribution of pressure and velocity. The pressure in the outlet oil chamber rises with rotation of rotor which makes the space smaller and smaller. In the result of postprocessor the maximum pressure is 4.3Mpa. This paper also studies on the internal velocity field distribution of pump body and pump cover. By the chart of velocity vector, fluid exists obvious reflow phenomenon. This is because of effection of the rotor rotation. The maximum velocity mainly exists in pump cover. Futhermore, flow characteristic curve is compared with the experimental result. The result basically shows the correctness of numerical simulation.

The Fluid Power Control Performance Comparison Study of Two-Type ER Valve Based on FLUENT

The current flow and pressure drop of ER valve which is a new type power control valve could be adjusted by the electric field signal directly .In this paper, the fluid power control performance of concentric cylindrical ER valve and parallel plate-type ER valve based on ER principal is comparative studied .First power control equation has been analysed, and then flow simulation of internal flow field of ER valve has been taken based on FLUENT software. The results show that with the increasing of the strength of excitation field, the flow through the two different type of ER valve decreases, the pressure drop between import and export is even greater; and the fluid power control performance of parallel plate-type ER valve is superior to concentric cylindrical ER valve under the same control volume.

Design of High-Speed Magnetic Centrifugal Blower Impeller and Numerical Simulation of Internal Flow Field

Currently, most domestic blower speed is still in 3000r/min level. The friction loss of mechanical bearings results in their low efficiency. To further improve the efficiency of the fan, a new high-speed maglev centrifugal fan was developed specially. The design of impeller styles, structure and size are rational. 3D graphics of the impeller and volute were drawn by using solidworks software. Application of CFD flow analysis software and the SIMPLE algorithm described viscous flow field within the three-dimensional centrifugal fan. By comparing simulation data with calculated data, optimize the turbine design. The simulative results are basically consistent with the design data, which provides a theoretical basis for the design of a new high-speed magnetic levitation fans, improving the level of centrifugal fan design.