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| Flow characteristics of viscous oil in rotor cavity of cam pump |
| 1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Wenzhou Pump and Valve Engineering Research Institute, Lanzhou University of Technology, Wenzhou, Zhejiang 325100, China; 3. School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China |
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Abstract To investigate the effects of viscosity, differential pressure and speed on the performance of cam pump, and analyze the change law of flow rate and excitation force, under different viscosity, differential pressure and speed, the three-dimensional transient numerical calculation of the flow field of cam pump was carried out and verified by experiments. The results show that with the increasing of viscosity from 1.8×10-5 m2·s-1to 2.2×10-4 m2·s-1, the outlet flow rate is increased from 16.856 m3·h-1 to 20.736 m3·h-1, and the outlet flow pulsation becomes stable with increased volume efficiency and widened high-speed zone of inlet and outlet. When the differential pressure is increased from 0.1 MPa to 0.6 MPa, the outlet flow rate and volume efficiency are decreased, while the outlet flow pulsation is basically consistent. The maximum absolute value of the force in x direction is increased from 514.04 N to 1 893.37 N, and the maximum value of the force in y direction is increased from 1 709.17 N to 8 855.57 N. When the speed is increased from 100 r·min-1 to 300 r·min-1, the flow rate and volume efficiency at the outlet are increased, and the average pressure at the outlet is increased from 400.552 kPa to 405.117 kPa, while the outlet flow pulsation and pressure pulsation are increased. The maximum absolute value of the force in x direction is increased from 1 211.17 N to 1 513.11 N, and the maximum value of the force in y direction is increased from 5 810.77 N to 6 276.51 N.
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