The Analysis and Simulation of Reactive Mufflers with Perforations

• Main Authors: Ping-Cheng Hwang, 黃柄晟
• Other Authors: Hua-Yi Hsu
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/eeyw5r

碩士 === 國立臺北科技大學 === 精密機構設計產業研發碩士專班 === 102 === The main objective of this work is to analyze the gas flowing through the car’s exhausting system, the noise and the impulse noise caused by the separators of the muffler. By investigating the pressure and velocity field with different model of perforations numbers on separators. We use the CFD tool to simulate the exhausting system and the flow field of the muffler. By calculating Navier-Stokes equations to solve this three-dimensional incompressible steady flow. This high Reynold number flow is described as the RANS state of turbulence model. The Standard k-ε model is applied to solve this turbulent flow. The aerodynamically caused noise model used here are: FW-H model and the BNS model which separately show the flow field and the sound pressure distribution of the flow in unsteady state and steady state. First step is create geometry of the flow field inside the muffler, then import the geometry into CFD. Meshing the geometry and set up boundary conditions, solution method. Lay out the figures and data.