Currently, accurate on-line leakage detection of pressure relief valves (PRVs) is still a challenge. This study presents an innovative method of detecting PRV leakage by generating sounds with a crest at a frequency of 32.7 kHz and a trough at a frequency of 25.0 kHz using specially designed cavity-shaped whistles. The accuracy of the leakage detection using the proposed method was superior to that of the commercial acoustic emission method. On the one hand, this is because the interference by the leakage jet noise could be alleviated by the discernable sound spectrum generated using cavity-shaped whistles. On the other hand, this is because the occurrence of the crest (32.7 kHz) and trough (25.0 kHz) of the generated sounds was independent of the leakage flow rate, leakage channel size, and sensor location. The integration of the cavity-shaped whistle with the PRV showed negligible effects on the PRV dynamic performance. The proposed method showed great potential for the leakage detection of the PRV given its advantages of low cost, high sensitivity and good accuracy.

当前，对减压阀（PRV）进行精确的在线泄漏检测仍然是一个挑战。这项研究提出了一种创新的方法来检测PRV泄漏，方法是使用专门设计的腔状口哨产生32.7 kHz的波峰和25.0 kHz的波谷声音。使用所提出的方法进行泄漏检测的准确性优于商业声发射方法。一方面，这是因为通过使用腔状口哨产生的可辨别的声谱可以减轻泄漏声的干扰。另一方面，这是因为所产生声音的波峰（32.7 kHz）和波谷（25.0 kHz）的出现与泄漏流量，泄漏通道大小和传感器位置无关。腔状口哨与PRV的集成对PRV动态性能的影响可忽略不计。该方法具有成本低，灵敏度高，准确度高等优点，在PRV的泄漏检测中具有很大的潜力。