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Numerical simulation on the flow field and cavitation in a scroll hydraulic pump |
SUN Shuaihui1,2, WU Kai1, HUANG Yi1, GUO Pengcheng1, LUO Xingqi1 |
1.Faculty of Water Resources and Hydroelectric, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 2.State Key Laboratory of Compressor Technology, Hefei, Anhui 230031, China |
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Abstract The computational fluid dynamics(CFD)technique was applied to simulate scroll hydraulic pump. The Schnerr-Sauer model was used to simulate the cavitation phenomena in the pump. The change of the fluid domain was simulated by the dynamic mesh technology with elastic deformation and grid reconstruction. The flow field in the scroll hydraulic pump under 0.5 mm meshing clearance was figured out, and the pressure and velocity at special points were monitored. The results showed that the pressure peak in suction chamber happened at 0° which reached 1.5 MPa. And the high-pressure difference between the external clearance resulted in the high-speed jet flow near the clearance which led to the vortex and cavitation. At the downstream of the clearance, the local area of suction chamber increased due to the movement of orbiting scroll, which generated the vacuum and cavitation. The vortex and cavitation led to the fluctuation of pressure and velocity of regions around, blocked the flow passage, and made the small wave of flow rate diagram. The movement of orbiting scroll and asymmetry of inlet made the difference of pressure, velocity and vortex distribution between the left and right flow passage and suction chamber. Moreover, during the later suction process, the flow in the right flow passage is almost motionless, and the fluid flowed into the right suction chamber mainly through the top flow passage.
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Received: 24 December 2015
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