柱塞泵阻尼槽噪声特性研究

提出了一种研究液压动力元件中阻尼槽噪声特性的新方法，通过把柱塞泵配流盘上的阻尼槽映射到滑阀上，隔离其他噪声源，对阻尼槽的气穴噪声特性进行单独研究。对两种典型阻尼槽（V形槽和U形槽）进行了压力分布测量、流场仿真及噪声信号测量，分析了阻尼槽结构、压力分布和噪声之间的内在规律。研究发现，配流盘吸油槽侧的渐扩形阻尼槽（V型槽）容易导致在柱塞腔卸压时出现气泡析出，诱发严重的气穴噪声，而具有等截面的阻尼槽 （U型槽）压力回升快速，可以显著抑制气泡析出。

Effect of groove configurations on noise characteristics in piston pump

A new method was proposed to investigate the effect of relief groove configurations on pump noise. The relief groove in piston pump was mapped to the notch on spool valve, so the cavitation noise of groove could be investigated separately. The pressure distributions and noise signals in two typical configurations of groove were measured, one groove with increasing sectional area (V groove), the other with constant sectional area (U groove). The experimental results of pressure distribution were validated by the numerical data obtained with the Fluent code. The results show that the noise characteristics of the groove are directly related to the pattern of the pressure distributions in the groove. The V groove shows a pattern of pressure distribution that causes a lot of bubbles and induces severe cavitation noise, while the U groove shows very good performance in restraining the formation of bubbles.