ASA 127th Meeting M.I.T. 1994 June 6-10

4aEA15. An experimental study of fundamental reactive silencers in the induction system of firing spark-ignition engines.

A. Selamet

Dept. of Mech. Eng. and Appl. Mech., 120 W. E. Lay Automotive Lab., Univ. of Michigan, Ann Arbor, MI 48109-2121

J. M. Novak

Ford Motor Co., Dearborn, MI 48121

The low-amplitude wave suppression of fundamental reactive silencers in the absence of flow is well established. The present experimental study investigates the performance of these configurations in the presence of both high-amplitude pressure waves and oscillating fluid flow. The silencers are installed in the induction system of a Ford 3.0-liter V6 Vulcan engine in a dynamometer test facility. The experiments with the firing engine have been conducted with speeds ranging from 1000 to 5500 rpm. Measurements including the mean flow rate, the temperatures and the absolute dynamic pressures of the induction air before and after the silencer with fast-response, piezo-resistive transducers facilitate the calculation of acoustic performance of these elements, as well as the flow losses and their influence on the engine performance. The present study describes the experimental aspects of an extensive effort towards employing nonlinear fluid dynamic models in the time-domain for the prediction of the acoustic and power performance of firing internal combustion engines with full vehicle induction and exhaust systems.