单双腔抗性消声器压力损失CFD研究

CFD Computation of Pressure Loss of Single and Dual-Chamber Resistance Mufflers

利用三维计算流体力学(CFD)方法计算了4种单腔和两种双腔抗性消声器的压力损失。研究了内插管、偏置输入管、偏置输出管和膨胀腔长度等消声器结构以及进口空气流速对单腔消声器压力损失的影响,中间挡板位置和空气流速对双腔消声器压力损失的影响,得出了相应结构对消声器的压力损失的影响规律,为抗性消声器的设计提供帮助。用实际算例验证了CFD方法计算压力损失的可行性,提供了一种利用计算流体动力学进行消声器压力损失的计算和分析流程,方便在设计阶段对消声器进行压力损失的近似预测。

Computatlonal fluid dynamics （CFD） method with 3-Dimension model was used to compute the pressure loss of mufflers which included four types of single-chamber mufflers and two types of dual chamber ones. The structural parameters for pressure loss study included the length of the chamber, insert duct and inlet/outlet ducts offset for single-chamber muffles and the positions of the baffle for dual-chamber mufflers with the air velocity as the variable parameters. The corresponding regularities have been obtained with the results of computations, which is helpful for muffler de sign. An actual perforated muffler has been tested with experiments to verify the feasibility of the computation of pressure loss with the method of CFD,which provides a fast and effective way to cornpule and analyze the pressure loss during the procedure of muffler design approximately.