Abstract
Our final target of this study is developing a simulation package for predicting the pressure pulsation inside automotive exhausting system. In the simulation technique the pulsations of pressure and flow are assumed to be governed by one-dimensional wave equation and the method of characteristic is used. The exhaust system is modeled by the combination of three fundamental elements (pipe, volume and orifice). This paper discusses the effect of both temperature variations and gas composition inside the system. As a result, the effect of temperature variations and gas composition is so large. Consequently, the temperature difference in the position should be taken into consideration.
