中文摘要：

以简单扩张式消声器为研究对象,基于CFD＋Virtual.Lab联合仿真方法,从声源类型角度分析了抗性消声结构中气流再生噪声的产生机理和影响因素。结果表明,偶极子和四极子是造成消声器气流再生噪声的主要因素,且扩张消声器中气流速度和出口管偏置距离的增加都会导致其气流再生噪声值的增大;相较于偶极子声源,四极子声源是扩张式消声结构中气流再生噪声的主要来源,且在低频处声压贡献量尤为明显。最后通过对比基于两种不同方法的气流再生噪声仿真结果,证明两种声源类型对气流再生噪声的贡献量不相关,为气流再生噪声计算提供了新思路。

英文摘要：

The regeneration noise mechanism and influence factors of simple reactive muffler were studied from the point of view of sound source type based on CFD and Virtual.Lab. The results show that flow regeneration noise is primarily caused by the dipole and quadrupole source and it becomes larger when the flow velocity and offset distance of outlet pipe are increased. The quadrupole is the main source of flow regeneration noise in the reactive muffler when compared with the dipole, especially in the low frequency region.Finally the conclusion drawn from the comparison of simulation results of the two methods shows that the two source types are irrelevant. The paper provides a new idea to calculate the flow regeneration noise.