Improving Design of Muffler Based on Three-dimension Numerical Calculation of Fluid and Sound Field

摘要

Presence problem of exhaust muffler is anal sized, using three three-dimension numerical calculation of fluid and sound field improvement on original structure is performed, and improving results are certificated. It is shown that insert loss under every rotational speed all reach to the standard of 28dB(A), and the noises of stationary end tube on the attention frequency band are all smaller than 5 dB(A) , and its pressure loss is decreased by about 32% than 7.6kPa of original structure muffler. So performance of the muffler is evidence increased, an important method is provided for decreasing whole vehicle noise, improving aerodynamic quality and reducing environmental pollution.