CFD Simulation and Test of a High Pressure Piston Pump with Pre-Compression Chamber Structure

摘要

Fluid noise in a piston pump is caused by pressure and flow ripples when the piston cavity rotates the pre-compression closed dead area of the valve plate. This paper studies a certain type of high pressure piston pump with pre-compression chamber. CFD simulations of the piston pump were carried out in PUMPLINX (R) and the results show that the flow ripple of piston pump is affected by the load pressure, pump speed and structure of the pre-compression chamber. DOE and approximate function technique are used to obtain the response surface function of flow ripple, which is expressed by structural parameters of the damping hole diameter and span angle of the pre-compression chamber. Damping hole diameter and span angle of the pre-compression chamber are optimized under different load pressures, based on the response surface function. After optimization, the outlet flow ripple rate is reduced under the load pressures of 100bar, 200bar and 300bar, respectively. Finally, piston pump flow rate test experiments are performed to verify the correctness of simulation.