ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

3aEA14. Helmholtz resonator in the induction system of a spark-ignition engine with production versus prototype manifolds.

A. Selamet

S. H. Yonak

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

Following an earlier work [A. Selamet and J. M. Novak, J. Acoust. Soc. Am. 97, 3393 (1995)], the present study investigates the performance of a Helmholtz resonator installed in the induction system of a Ford 3.0 Liter V6 Vulcan engine in a dynamometer test facility. Earlier findings with the production manifold are compared with the current results obtained with a modified prototype manifold in an attempt to determine the extent of multidimensional wave dynamics. The induction system is instrumented with fast-response piezoresistive transducers to capture the temporal and the spatial variation of air pressure. Measured insertion loss characteristics of the silencer are then discussed in comparison with the predictions from a nonlinear computational fluid dynamics approach in the time domain.