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Technical Briefs

Benchmark Experimental Data for Fully Stalled Wide-Angled Diffusers

[+] Author and Article Information
K Kibicho

Department of Mechanical Engineering, Jomo Kenyatta University of Agriculture and Technology,P. O. Box 62000, Nairobi 00200, Kenya

A. T. Sayers

Department of Mechanical Engineering, University of Cape Town, Rondebosch 7701, South Africa

J. Fluids Eng 130(10), 104502 (Sep 08, 2008) (4 pages) doi:10.1115/1.2969270 History: Received November 21, 2006; Revised June 27, 2008; Published September 08, 2008

Due to adverse pressure gradient along the diverging walls of wide-angled diffusers, the attached flow separates from one wall and remains attached permanently to the other wall in a process called stalling. Separated diffuser flows provide a classical case of pressure driven flow separation. Such flows present a very serious challenge to fluid dynamics modelers. This paper provides a data bank contribution for the streamwise mean velocity field and pressure recovery data in wide-angled diffusers. Turbulent mean flow measurements were carried out at Reynolds numbers between 1.07×105 and 2.14×105 based on inlet hydraulic diameter and centerline velocity for diffusers whose divergence angles were between 30deg and 50deg. The results presented provide a reliable validation data bank for computational fluid dynamics studies for pressure driven flow separation studies.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Two-dimensional diffuser geometry and the frame of reference

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Figure 2

Experimental apparatus

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Figure 3

Coefficient of static pressure for the 30 deg diffuser

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Figure 4

Coefficient of static pressure for the 40 deg diffuser

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Figure 5

Coefficient of static pressure for the 50 deg diffuser

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Figure 6

Axial velocity profiles for the 30 deg diffuser

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Figure 7

Axial velocity profiles for the 40 deg diffuser

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Figure 8

Axial velocity profiles for the 50 deg diffuser

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