Performance Improvement of Diesel Engine Exhaust Muffler Based on Three-Dimensional Numerical Analysis

To solve heavy exhaust noise of a diesel engine,bench experiments on independently measuring exhaust noise were designed and carried out.Combining with the measured frequency spectrum of exhaust noise and numerical simulation of muffler,the performance deficiencies of muffler were analyzed,which shows relatively lack of acoustic attenuation performance in middle-high frequency range.Dcreasing the diameter of perforated hole and perforated structure,increasing resonant cavity,designing ideal expanding cavity,and comprehensive consideration of acoustics and fluid performance for muffler,the performance of the mufflers is improved.Test shows that the amount of insertion loss of improved muffler is 10,dB higher than the original one.