基于流声耦合的球阀气体内漏数值分析

Numerical Analysis of Gas Leakage in Ball Valve Based on Flow Acoustic Coupling

针对阀门在工业中发生气体内漏的问题,利用流声耦合的方法对一种球阀的内漏情况进行了数值分析,通过对球阀发生内漏时的流场和声场特征进行数值计算,得到了内漏量、声压级频率响应函数和总声压级等。结果表明:球阀发生内漏时,在内漏间隙出口会产生高速射流,最高射流速度已超过声速;各内漏间隙的频谱特征相似,具有相同的峰值频率段,但各内漏间隙的总声压级不同;阀门内漏时的总声压级能很好的反映阀门的内漏状态,通过计算得到的数据拟合出总声压级和内漏量的定量关系式,在已知总声压级的情况下,可以达到定量检测阀门内漏泄漏量的目的。

Aiming at the problem of gas leakage in the valve in industrial sectors, the author carried out numerical analysis on the internal leakage of a kind of ball valve by means of flow acoustic coupling meth od, implemented numerical calculation of the flow field and sound field characteristics of the ball valve when internal leakage occurs, and obtained the internal leakage, the frequency response function of sound pressure level and the total sound pressure level. The results show that high speed jet will be produced at the outlet of the leak gap when the internal leakage occurs in ball valve, and the maximum jet velocity ex ceeds the sound velocity; the frequency characteristics of the leak gap are similar, with the same peak fre quency band, but the total sound pressure level of the leak gap is different; the total sound pressure level of the internal leak can perfectly reflect the leakage condition of the valve. The quantitative detection of the internal leakage amount of the valve can be completed by figuring out the quantitative relationship between the total sound pressure level and the internal leakage amount with the calculated data, under the condition that the total sound pressure level is known.