There are many closed side branches in the gas conveying pipeline system. When the gas passes through the closed side branch, the shear layer will arouse the acoustic resonance in the closed side branch, which is harmful to the safe operation of the pipeline. The research work is insufficient about the influence of the cross-section shape of the closed side branch on acoustic resonance. Using the Detached-Eddy Simulation (DES) model, the acoustic resonance characteristics caused by the side branch pipe with different square cross-sections are simulated at the inlet boundary conditions of 25 m/s, 30 m/s and 35 m/s. The results show that in the center axis of the side branch, a 1/4 wavelength standing wave was formed, and the acoustic resonance occurs at a higher Strouhal number in circular branch. The cross-section shape of the side branch does not affect the acoustic resonance frequency, but it has a certain influence on the amplitude of pressure fluctuation and has a significant influence on the high-order frequency components.
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机译：气体输送管道系统中有许多封闭的侧支管。当气体通过封闭侧支路时，剪切层将引起封闭侧支路的声共振，这对管道的安全运行是有害的。关于闭合侧支路的截面形状对声共振的影响的研究工作还不够。使用分离涡模拟（DES）模型，在入口边界条件为25 m / s，30 m / s和35 m / s的情况下，模拟了具有不同方形横截面的侧支管引起的声共振特性。结果表明，在侧分支的中心轴上形成了一个1/4波长的驻波，并且在圆形分支中以较高的Strouhal数发生了声共振。侧分支的横截面形状不影响声共振频率，但对压力波动幅度有一定影响，对高次频率分量有很大影响。
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