A Numerical Method for Predicting Sound Characteristics and Pressure Losses of Silencers in Internal Combustion Engines

• Published in: Nihon Kikai Gakkai rombunshuu. B hen Vol. 58; no. 555; pp. 3507 - 3512
• Main Authors: ISSHIKI, Yoshihiro, SHIMAMOTO, Yuzuru, WAKISAKA, Tomoyuki, AKAGI, Mitsuhiro
• Format: Journal Article
• Language: English; Japanese
• Published: The Japan Society of Mechanical Engineers 1992
• Subjects: Intake and Exhaust Systems
• ISSN: 0387-5016; 1884-8346
• DOI: 10.1299/kikaib.58.3507

A numerical method has been investigated for predicting the sound characteristics and the pressure losses of intake silencers in internal combustion engines. Firstly, the gas exchange process in intake and exhaust systems has been calculated by a one-dimensional characteristic method. Using these calculated results as the boundary conditions, the two-dimensional calculation of unsteady gas flow in the silencers has been carried out by means of a finite difference method. The results show that the behavior of the pressure wave propagation and the gas motion in largely fluctuating flow fields is well simulated with little false diffusion by applying a CIP (Cubic Interpolated Pseudo-Particle) method. Consequently, the present numerical method could be useful to predict both the sound characteristics and the pressure losses of real silencers by developing the method into the three-dimensional analysis.