Experimental Study of Flow in a High Aspect Ratio 90 Deg Curved Diffuser

[+] Author and Article Information
B. Majumdar, Ratan Mohan, S. N. Singh, D. P. Agrawal

Departments of Applied Mechanics and Mechanical Engineering, Indian Institute of Technology, Delhi, New Delhi—110 016, India

J. Fluids Eng 120(1), 83-89 (Mar 01, 1998) (7 pages) doi:10.1115/1.2819668 History: Received July 25, 1994; Revised October 15, 1997; Online December 04, 2007


Measurements for developing turbulent flow in a high aspect ratio (AS = 6), small area ratio (AR = 2), 90 deg curved diffuser have been made. Mean velocities, static and total pressures, and turbulence intensities were measured using a three-hole pressure probe and a hot-wire probe. Flow visualization studies were also made using a tuft probe. Experiments show that, except for a very small zone near the exit, there is no flow reversal in any part of the diffuser. Streamwise bulk flow is seen to shift toward the concave wall side in the downstream half of the diffuser, under the influence of centrifugal force. One pair of counter-rotating vortical motion was identified at 30 deg turn, which break into more pairs (at least two) of counter-rotating vortices in the downstream. The z-plane velocity profiles show a nearly 2-D flow in the initial part of the diffuser but subsequently the flow becomes increasingly 3-D. A static pressure recovery coefficient of 51 percent was achieved.

Copyright © 1998 by The American Society of Mechanical Engineers
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