节流槽结构对气穴噪声的影响

Effect of throttling grooves structure on cavitation noise

为了消除液压阀中的噪声,对不同节流槽内部压力分布、气穴形态和噪声频谱进行了研究.在对节流槽结构特征及流动模型进行分析的基础上,预测了节流阀内气穴噪声的声压模型.通过高速观测及噪声频谱分析对模型进行了验证,并估计了节流阀内的气泡尺寸.结果表明,节流槽结构特征对阀内压力分布、气穴与噪声特性有直接的影响,U形槽内部压力超调量明显高于V形槽,可以显著抑制气穴的析出与生长.不同类型节流槽通过压力分布决定了气泡的成长过程,与U形槽相比,V形槽内部气泡尺寸较大,气泡尺度大小是影响节流槽气穴噪声的主要因素.

To eliminate hydraulic valves noise pressure distributions, cavitation and noise spectrum inside different throttling grooves were studied. The structure characteristics and flow-model of throttling groovewere analyzed, and the sound-pressure model of cavitation noise inside throttling valves was predicted. The model was verified with high-speed observation and noise-measurement spectrum analysis, and the bubble size inside the throttling valve was calculated. The results show that the structural characteristicsof throttling grooves have direct influences on pr Pressure overshoot inside U-notch is much highe opment of cavitation. The growth of cavitation i throttling grooves. Bubble size inside V-notch is the major factor affecting cavitation noise in the essure distribution, r than V-notch, and s determined by the bigger than that of throttling grooves. cavitation and noise inside can restraint pressure dist U-notch, and the inception ribution insid the valve. and devele different the bubble dimension is the major factor affecting cavitation noise in the throttling grooves.