内流道形状对溢流阀气穴噪声影响的研究

从流场控制的角度，研究了溢流阀内流道结构对气穴及气穴噪声的影响。采用流场数值仿真和流动显示试验，获得了溢流阀主阀流道内的压力和气穴分布图像，仿真结果中的低压区与试验结果中气穴区基本吻合。此外，对两种溢流阀主阀流道结构进行了噪声测试和对比分析。结果表明，具有环形槽的主阀芯结构能有效抑制气穴和气穴噪声。这项研究对于以降低噪声为目标的溢流阀流道结构优化设计具有一定的指导意义。

EFFECTS OF INTERNAL STRUCTURE ON CAVITATING NOISE OF HYDRAULIC RELIEF VALVE

From the view of flow field control, the influence of internal structure on cavitations as well as cavitating induced noise within a hydraulic relief valve is investigated. The CFD (Computational fluid dynamics) and flow visualization approaches are used to obtain static pressure distributions and cavitation images in the channel of the main stage of the valve. The predicted low-pressure regions agree well with the observed cavitation areas. In addition, the noise level from two main internal structures of relief valves are tested and compared. The results show that the main element with circumferential undercut groove can suppress the cavitations and cavitating noise. The work provides some useful reference for the low noise design of hydraulic component involving internal structure optimization.