气体管道泄漏次声源仿真模拟及试验研究

Simulation and experimental study on infrasound source of gas pipeline leakage

管道泄漏次声波声源特性的研究是次声波法适应性及定位精确性的重要保障,首先对气体管道泄漏声源进行了理论分析,然后通过建立管道泄漏内外流场及声学模型对泄漏声源进行仿真模拟,最后通过试验验证。结果表明:1、气体管道泄漏次声波声源主要成分是四极子声源。2、气体管道泄漏次声信号能量主要集中在0-5 Hz的频段内。3、泄漏次声信号声压值随着管道泄漏孔径的增大而增大,随管道初始压力的增大而增大。

The research on the characteristics of the pipeline leakage infrasound source is an important guarantee for the adaptability and positioning accuracy of the infrasound method. Firstly, the theoretical analysis of the gas pipeline leakage sound source is carried out, and then the leakage sound source is simulated by establishing the internal and external flow fields and acoustic models of the pipeline leakage simulation, And finally verified by experiment. The results show that: 1. The main component of the infrasound source of gas pipeline leakage is the quadrupole source. 2. The energy of the infrasound signal leaking from the gas pipeline is mainly concentrated in the frequency band of 0-5 Hz. 3. The sound pressure value of the leakage infrasound signal increases with the increase of the leakage aperture of the pipeline, and increases with the increase of the initial pressure of the pipeline.