Simulation On Pressure Loss Of Automotive Exhaust Resistance Muflfer

With the rapid development of automobile industry in recent years, the noise pollutionhas become a global problem. The engine exhaust noise is one of the major sources of vehiclenoise; a good performance exhaust muffler is an effective way to reduce noise. The overallquality of China’s automotive industry is impacted by the automobile exhaust mufflerdesigned level, which is evaluated by acoustic performance and aerodynamic performance. Toface the energy crisis and build environment-friendly society, the pressure loss is as importantas acoustic performance to muffler’s performance. Under the assurance of meeting thestandards, try to reduce the pressure loss to improve the engine fuel economy. Further more,the improvement of the muffler can make our country get out of the trouble and improve theworld competitiveness of the domestic muffler to get both economic and social benefits.The variations of the pressure loss under different units and inlet velocity are discussedin the article. The flow distribution and pressure loss of a complex structure of the resistancemuffler are also researched in the thesis. By the method of CFD, we got the variations of thepressure loss with different structure and boundary conditions through the courses ofmodeling, meshing, setting proper parameters and so on. After the numerical simulation of themuffler units including expansion chamber, intubation and perforated pipe，The fields of thevelocity, pressure and turbulent kinetic energy were showed to get the law of the pressure losswith different velocity conditions, which can offer the theory to the design of the muffler. Atlast, by comparing the bench test, the numerical calculation method is feasible and effective toanalyze the pressure loss.