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- 2018
穿孔管消声器声学特性预测的单向耦合计算方法
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Abstract:
基于流场与声场之间的单向耦合方法, 研究了低马赫数非均匀流对穿孔管消声器声学特性的影响．首先使用CFD方法获取速度场分布, 然后通过声学有限元计算得到声压场分布, 最后利用基于非线性最小二乘法的曲线拟合进行平面波分解计算得到消声器的传递损失．对于直通和横流穿孔管消声器, 传递损失数值计算结果和实验测量结果吻合良好．计算结果表明, 在入口马赫数低于0.2的条件下, 气流对于直通穿孔管消声器在平面波范围内的声学性能影响较小, 而在高频范围内气流的影响作用应当引起重视; 横流穿孔管消声器的声学性能对于气流速度的变化更加敏感．
Based on the one-way coupling method between flow field and acoustic field，the influence of low Mach number non-uniform flow on the acoustic performance of perforated tube silencers was investigated. The flow velocity field distribution was first obtained by using CFD，and then the sound pressure field distribution was determined from the acoustics finite element computation. Finally，a nonlinear least-square curve-fitting algorithm was used to decompose the plane sound wave for the evaluation of silencer’s transmission loss. For the straight-through and cross-flow perforated tube silencers，the good agreements between the numerical predictions and experimental measurements were observed. As the inlet Mach number is less than 0.2，the numerical results demonstrate that the influence of air flow on the acoustic performance is marginal in the plane wave dominated frequency range and is noticeable at higher frequencies for the straight-through perforated tube silencer，while the acoustic performance of cross-flow perforated tube silencer is more sensitive to the change of air flow
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