掺氢管道V型球阀内漏流场与声场特性OA

Failure of natural gas pipeline valves posed a serious threat to the safe operation of pipeline systems,and internal leakage in hydrogen-blended pipelines further exacerbates this risk.Based on the ANSYS Fluent platform,the SST k-ω turbulence model and the broadband noise model were employed to numerically simulate the characteristics of the leakage flow field and acoustic field.As the ball valve opening increases from 5° to 30°,the peak velocity in the leakage flow field first decreases and then increases,while the region of high velocity continues to expand.The maximum sound pressure level in the acoustic field similarly exhibits a trend of first decreasing and then increasing,with the sound pressure distribution gradually extending from the valve cavity to 3 m pipe section downstream of the ball valve.As the pressure difference continuously increases,the peak velocity in the leakage flow field rises steadily.When the pressure difference across the ball valve increases from 0.1 MPa to 0.6 MPa,the peak sound pressure level increases from 78.1 dB to 108 dB.As the hydrogen blending ratio increases to 25％,the peak jet velocity rises from 121 m/s to 202 m/s,representing an increase of 67％,while the maximum sound pressure level increases from 85.3 dB to 97.1 dB with an increase of 13.8％.