Structure of Turbulence in an Incipient-Separating Axisymmetric Flow

[+] Author and Article Information
Rakesh K. Singh, Ram S. Azad

Department of Mechanical and Industrial Engineering, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

J. Fluids Eng 117(3), 433-438 (Sep 01, 1995) (6 pages) doi:10.1115/1.2817280 History: Received December 26, 1993; Revised October 21, 1994; Online December 04, 2007


The relative intensity, skewness, and flatness of fluctuating streamwise velocity along the centerline of an 8 deg included angle conical diffuser show dramatic rapid growth in the final stages of the flow under the increasing influence of growing instantaneous reversals in the wall-layer. Pulsed-wire anemometry was effectively used for the measurement of quantitative instantaneous reversals and the turbulent flow field. In the severe adverse pressure gradient of the diffuser flow, the maxima of the streamwise and transverse fluctuating velocities, Reynolds shear stress, and turbulent energy production coincide and move away from their near-wall position in the pipe, also the velocity triple products show completely opposite nature as compared to the pipe flow. These measurements reveal the strong influence of instantaneous backflow on the structure of turbulence. The present results further corroborate the ability of the “structural” turbulence model of Nagano and Tagawa (1990) to predict velocity triple products in an axisymmetric diffuser flow.

Copyright © 1995 by The American Society of Mechanical Engineers
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