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.
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. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(15): 219-224.
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