Fluid Distribution Characteristics of Occurring Flow Regeneration Noise from Muffler Element

Detailed structure parameters of simple expansion chamber muffler element work piece are determined using orthogonal experimental designing method.Flow regenerated noise was measured on the self-design test bench.Based on the analysis of interior flow,the characteristic parameter for fluid field distribution is provided,and related model of flow regenerated noise is established.When structure pa-rameters are constant,velocity distribution characteristic of inner chamber does not vary with the varia-tion of inlet flow velocity,and it only shows the difference in numerical values.Characteristic parameter of flow field distribution shows the same trend to that of regeneration noise.The relationship on flow re-generation noise,the characteristic parameter and inlet velocity is obtained at different velocity.Compari-son shows good agreement between model prediction and experimental data.It provides the reference to improve the dynamic attenuating characteristic of the mufflers.