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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。
Taking Lighthill aerodynamic acoustics equation as control equation, finite difference method was used to simulate the leakage sound field of ball valve gas under different internal leakage and pressure difference. We got their influence on the acoustic field strength and propagation characteristics of the internal leakage of the ball valve gas and determined the position where the acoustic field strength of the ball valve leakage was the highest. Numerical simulation shows that the internal leakage noise near the secondary cutoff is the strongest, and the noise can increase with the increase of internal leakage and pressure difference. This provides a theoretical basis for acoustic detection and quantitative analysis of internal leakage of ball valve gas. At the same time, the acoustic method was used to test the internal leakage of the ball valve. The experimental results also verify the correctness of the numerical simulation.