球阀气体内漏的声场数值模拟及实验研究

Numerical simulation of the sound field and experiment research of ball valve gas inner leakage

以Lighthill气动力声学方程作为控制方程,采用有限差分法,对不同内漏度和压力差下的球阀气体内漏喷流声场进行了数值模拟。得出它们对球阀气体内漏喷流声场强度和传播特性的影响,确定了球阀气体内漏声场强度最高的位置。数值模拟表明,二次截流处附近的内漏噪声最强,噪声能随着内漏度和压力差的增大而增强,这为球阀气体内漏声学检测与定量分析提供了理论依据。同时采用声学方法对球阀的内漏发声进行了实验研究,实验结果也验证了数值模拟的正确性。

Based on the Lighthill aerodynamic acoustics equation, the sound field is mumerically simulated with the difference method, with different inner situation and Intensity of jet sound field, and the spread characteristic are educed, the position where acoustic intensity reaches the highest level is found. The result show that, the second cut place has the most intensity of jet noise, noise energy become strengthen whit enhance of inner situation and pressure difference, that provides a foundation for acoustic examination and quantitative analysis of valve gas inner leakage. At the same time ball valve inner leakage is experimented by acoustic method, the result proves the correct of numerical simulation.