切向流作用下直通穿孔管阻性消声器传递损失预测

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (15) : 219-224.

论文

贺志荣，季振林

作者信息 +

Prediction of transfer loss in a straight-through perforated pipe dissipative muffler under tangential flow

HE Zhirong, JI Zhenlin

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文章历史 +

摘要

使用考虑涡粘系数的频域线性纳维斯托克斯方程(linearized Navier-Stokes equations，LNSEs)计算切向流作用下直通穿孔管阻性消声器的传递损失，计算步骤为：(1)运用CFD（computational fluid dynamics）方法求解计算域内的时间平均流动变量，然后将变量映射至声学网格，(2)将声传播介质分为空气和吸声材料，后者等效为具有复声速和复密度的流体，使用频域LNSEs计算声场，最后利用平面波分解法计算消声器的传递损失。计算结果与实验测量结果吻合良好，从而证明了计算方法的正确性。通过数值计算分析了切向流马赫数对不同流阻率和穿孔结构阻性消声器传递损失的影响规律。随着切向流马赫数的增加，消声器在低频域的传递损失有所降低，中高频消声性能变化无明显规律可循;切向流对低穿孔率消声器传递损失的影响大于高穿孔率。

Abstract

The frequency-domain linearized Navier-Stokes equations (LNSEs) considering the eddy viscosity are employed to predict transmission loss of straight-through perforated-tube dissipative muffler in the presence of grazing flow. The calculations are performed in two steps: (1) the time-averaged flow variables in computational model are solved by using CFD method and then are mapped into acoustic mesh, (2) the acoustic medium is divided into air and sound-absorbing material which is fluid with complex sound speed and density, then the frequency-domain LNSEs are adopted to evaluate the acoustic perturbation, last the transmission loss is predicted by using plane wave decomposition method. Good agreements of transmission loss predictions and measurements proved the correctness of predictive method. Further, the effects of grazing flow Mach numbers on the transmission loss of dissipative mufflers with different flow resistivity and perforated structures are analyzed by numerical calculations. With the increasing of the grazing flow Mach numbers, the transmission loss of the mufflers in the low frequency domain decreases, and there is no obvious regular pattern to search for acoustic attenuation performance in the medium and high frequency ranges; the effect of grazing flow on the transmission loss of mufflers with low porosity is greater than that with high porosity.

导出引用

贺志荣，季振林. 切向流作用下直通穿孔管阻性消声器传递损失预测[J]. 振动与冲击, 2023, 42(15): 219-224

HE Zhirong, JI Zhenlin. Prediction of transfer loss in a straight-through perforated pipe dissipative muffler under tangential flow[J]. Journal of Vibration and Shock, 2023, 42(15): 219-224

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