Dept. of Mech. Eng. and Appl. Mech., 120 W. E. Lay Automotive Lab., Univ. of Michigan, Ann Arbor, MI 48109-2121
Following an earlier work by Selamet et al. [Proc. Inter-Noise 95, 425--430 (1995)], the present analytical, computational, and experimental study investigates the effect of duct cross-sectional area variation on the wave attenuation and flow performance. Two different Venturi configurations, Herschel Venturi tubes and Universal Venturi tubes, are compared. Four Venturi tubes are fabricated in each category with duct to throat cross-sectional area ratios varying from 2 to 16 and used in the experimental effort. The results from these configurations are then discussed in terms of the acoustic attenuation versus flow efficiency.