Valve Plate for Piston Pump Cavitation Problem with the Damp Groove Structural Optimization

Abstract

To reduce the cavitation occurring on valve plate of typical Swashplate piston pump, an optimization design method was introduced to quantitively analyse the accurate relationship between structural jet grooves parameters and cavitation.Using the CFD method, the sunking and discharging process in piston pump was simulated dynamically.The damp grooves structure effect on both jet angle and pressure shock were analysed visually with a series of different parametrical grooves.By establishing parametrical damp groove model, the piston pumps dynamic analysis was integrated with the technologies of CFD analysis, experimental design and approximation model, etc.The mathematical model of plunger pressure in oil back period, jet angle and structural parameters of damp groove were established in the form of second-order RSM model. The damp groove structure of valve plate was optimized on the basis of the RSM model.Test data show that the anti-cavitation performance of optimized valve plate was increased obviouslyAnd this method provided theoretical foundation for the structure design of damp groove.

A Review of High-Speed Electro-Hydrostatic Actuator Pumps in Aerospace Applications: Challenges and Solutions

“…As shown in Fig. 9, the damping hole increases the jet angle and thereby makes the cavitation collapse away from the solid surface of the valve plate [33]. However, the generated vapor bubbles and jetting flow in the damping hole can cause erosion damage there [57].…”

“…3(a). The high velocity jet flow results from the negative pressure gradient when the discharge pressure is initially greater than the cylinder pressure at the start of the discharge stroke [23,[29][30][31][32][33]. As a result, the localized pressure could drop below the vapor pressure, leading to the cavitation near the relief groove and cylinder ports.…”