UNSTRUCTURED GRID FINITE-VOLUME ANALYSIS FOR ACOUSTIC AND PULSED WAVE-PROPAGATION CHARACTERISTICS IN EXHAUST SILENCER SYSTEMS

The unstructured grid finite volume method has been applied to predict the linear and nonlinear attenuation characteristics of the expansion chamber type silencer system. In order to achieve grid flexibility an d a solution adaptation for geometrically complex flow regions associa ted with the actual silencers, the unstructured mesh algorithm in cont ext with the node-centered finite volume method Bar been employed. The validation cases for the linear and nonlinear wave propagation charac teristics include the acoustic field of the concentric expansion chamb er and the axisymmetric blast flow field with the open end Effects of the chamber geometry on the nonlinear wave propagation characteristics are discussed in detail.