新型通海阀流噪声的数值模拟对比研究

Comparative study on numerical simulation of flow noise of a new type of sea valve

角式双球阀作为一种新型通海阀,针对其内部流道结构在不同流速下产生的噪声问题,基于计算流体动力学(CFD)与直接边界元法(BEM)对其进行流噪声数值模拟研究,分析2种不同结构形状角式双球阀的流噪声声压级以及其不同流速下的流噪声变化规律。结果表明,2种结构声压级均随频率的升高而降低,低流速时,双球阀低频特性更明显;开放式流道结构流噪声声压级明显高于封闭流道结构,由于封闭流道结构内部流体较好的流通性,其噪声总声压较开放式结构下降约26.9%,降幅为17 dB(A),封闭结构设计可以有效降低通海阀内流道流体脉动压力与流噪声,从而为新型通海阀的降噪优化提供一种新思路。

Angle double ball valve is a new type of sea valve,aiming at the noise problem caused by its internal flow channel structure at different flow rates,the flow noise numerical simulation of sea double ball valves is carried out based on computational fluid dynamics(CFD)and direct boundary element method(BEM).The flow noise sound pressure level of two kinds of angle double ball valves with different structure shapes and the variation law of flow noise at different flow rates are analyzed.The results show that the sound pressure level of the two structures decreases with the increase of frequency,and the low frequency characteristic of double ball valve is more obvious at low flow rate.The sound pressure level of the flow noise of the open channel structure is obviously higher than that of the closed channel structure.Due to the good fluid fluidity of the closed channel structure,the total noise sound pressure level of the closed channel structure is reduced by about 26.9%compared with the open structure,with a decrease of 17dB(A).The closed structure design can effectively reduce the fluid pulsating pressure and flow noise in the inner channel of the sea valve,which provides a new idea for the noise reduction optimization of the new type sea valve.