Study of Silencer Characteristics in Gas Flow with Shock Wave. 2nd Report, Pressure Characteristics of Silencer.

Abstract

In order to obtain design data for the determination of a silencer configuration which can effectively suppress weak shock waves generated in an automobile exhaust pipe, a shock tube experiment and numerical simulation were carried out. Characteristics of the silencer were investigated by measuring pressure at the inlet and outlet of the silencer. It was found that a two-room silencer with an insertion offset pipe gives the most optimal efficiency of attenuation of shock waves. Numerical simulation indicated that the rate of change of the silencer cross-sectional area was directly proportional to the efficiency of attenuation of shock wave.