A new numerical model of gas leakage noise from elliptical sealing defects in pipelines

During the assembly of aviation conduits, various quasi-elliptical sealing anomalies often arise due to diverse factors. This paper presents a new numerical model for analyzing the noise distribution pattern of quasi-elliptical holes. Analogous to the velocity distribution law of an elliptical jet, the velocity distribution function of an elliptical defect boundary is constructed, and then the gas leakage flow field is solved by using the large eddy simulation method, and then the near-field noise distribution is calculated by using CFD. The model discerns that the rate of sound pressure level reduction along the minor axis surpasses the major axis as the aspect ratio increases. Within the azimuth angles plane, sound pressure levels gradually decrease from the minor to the major axis direction, and the discrepancy between sound pressure levels along these two axes diminishes with an increase in aspect ratio. Experimental validation underscores the model's precision, with accuracy exceeding 90% in approximating noise pressure levels near leakage sites.