密闭容器清吹过程气液两相流动及噪声分析OA

The coupling mechanism of gas-liquid unsteady flow and flow-induced noise during the pur-ging process in a confined vessel with an inclined configuration was investigated.A hybrid numerical framework combining CFD and computational acoustics(CA)was established based on the VOF inter-face tracking method and Lighthill's acoustic analogy.Transient simulations of the coupled flow and acoustic fields were performed during the initial purging stage,and two operating conditions—low back pressure with high pressure difference and high back pressure with low pressure difference—were com-paratively analyzed.The results show that high-speed gas jet impingement induces pronounced surface depression,entrainment,and splashing structures,generating strong pressure fluctuations and broad-band noise radiation.Increasing pressure difference enhances the purging rate in the stable stage but intensifies interfacial breakup and ventilation in the drainage pipe,resulting in an increase of approxi-mately 30 dB in overall sound pressure level.Under high back pressure and low pressure difference conditions,the flow evolution is more stable,the purging time increases only slightly,and the noise is significantly reduced.This study reveals the regulatory effect of pressure difference on the scale and characteristic frequency migration of unstable flow,providing a theoretical basis for optimizing purging parameters and controlling radiated noise.