Model Study on Pressure Loss of the Split-Stream Rushing Exhaust Muffler

Numerical calculation of pressure loss of the split-stream rushing exhaust muffler was performed and the accuracy of the calculation method was verified by experiment. The experiment of pressure loss was designed by the design-expert method. A mathematical model was established to analyze the relationship between the pressure loss and experiment factors such as the diameter of internal cavity,the shape of the punching hole,the center distance of the punching hole,the cone angle of the internal cavity dividing unit and the airflow speed. The response surfaces of the second order interaction between different variables on the pressure loss were obtained and the interaction relationships were analyzed. The results show that the internal cavity diameter and the airflow velocity are main factors affecting the pressure loss. As the airflow speed increases,the pressure loss increases significantly. As the diameter of internal cavity increases,the pressure loss decreases first and then increases rapidly. When the shape of the punching hole is rectangular,the pressure loss is small. The center distance of the rushing hole and the cone angle of the internal cavity stream unit have little effect on the pressure loss. Taking the pressure loss as the optimization index,the best test condition was obtained. The research results will provide a reference for the theoretical research and optimization design of the split-stream rushing exhaust muffler. © 2020, Editorial Office of the Transaction of CSICE. All right reserved.