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Served as a core component, the performance of the hydraulic transformer (HT) directly affects the energy-saving performance of the common pressure rail (CPR) system. The pressure reduction process of HT is accompanied by an expansion of the plunger cavity, which can result in a steep pressure drop and lead to cavitation under certain working parameters. In order to enhance the performance, a double rotor hydraulic transformer (DRHT) is proposed, and systematic analysis of the pressure reduction process in DRHT is provided by the CFD simulation and experimental test. The CFD model is based on the dynamic mesh method considering both cavitation and turbulence. The experiment is carried on with a specially designed prototype and four kinds of valve plates. The results show that the transient pressure decreases sharply with increasing rotating speed, and minimum transient pressure is reached at the control angle of −30 degrees. The damping groove can deter the volume expansion effect and thus enlarging the working range, but the volume loss will be incurred. The results of the parameter study show that the damping groove with the length 4 mm and the depth 3 mm can avoid the excessively low transient pressure occur while maintaining low volume loss. The simulation curves have good consistency with the test results, which credit the numerical method feasible and effective. The current work is also significant for further design and the application of the DRHT.

The Experimental and CFD Research on the Pressure Reduction Process of the Double Rotor Hydraulic Transformer