Benchmark Experimental Data for Fully Stalled Wide-Angled Diffusers

K Kibicho; A. T. Sayers

doi:10.1115/1.2969270

Journal of Fluids Engineering | Volume 130 | Issue 10 | Technical Brief

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Benchmark Experimental Data for Fully Stalled Wide-Angled Diffusers

K Kibicho and A. T. Sayers

[+] 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

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Abstract

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 $1.07 \times 10^{5}$ and $2.14 \times 10^{5}$ based on inlet hydraulic diameter and centerline velocity for diffusers whose divergence angles were between $30 deg$ and $50 deg$ . The results presented provide a reliable validation data bank for computational fluid dynamics studies for pressure driven flow separation studies.

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References

Fox, R., and Kline, S., 1962, “Flow Regime Data and Design Methods for Curved Subsonic Diffusers,” ASME J. Basic Eng., 84 , pp. 303–312.

Reneau, L., Johnston, J., and Kline, S., 1967, “Performance and Design of Straight, Two-Dimensional Diffusers,” ASME J. Basic Eng., 89 (1), pp. 141–150.

Kline, S., Abbort, D., and Fox, R., 1959, “Optimum Design of Straight-Walled Diffusers,” ASME J. Basic Eng., 81 , pp. 321–331.

Obi, S., Aoki, K., and Masuda, S., 1993, “Experimental and Computational Study of Separating Flow in an Asymmetric Planar Diffuser,” "Proceedings of the Ninth Symposium on Turbulent Shear Flows", Kyoto, Japan, Aug. 16–18, Vol. 305 , pp. 1–4.

Buice, C., and Eaton, J., 1997, “Experimental Investigation of Flow Through an Asymmetric Plane Diffuser,” Center for Turbulence Research, Stanford University, Report No. TSD 107.

Kibicho, K., 2006, “Flow-Field Structure in Wide-Angled Diffusers,” Ph.D. thesis, University of Cape Town, South Africa.

Yajnik, K., and Gupta, R., 1973, “A New Probe for Measurement of Velocity and Flow Direction in Separated Flows,” J. Phys. E, 6 , pp. 82–86.

Rhagava, A., Kumar, K., Malhotra, R., and Agrawal, D., 1979, “A Probe for the Measurement of Velocity Field,” ASME Trans. J. Fluids Eng., 11 (1), pp. 143–146.

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Two-dimensional diffuser geometry and the frame of reference

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Figure 1

Two-dimensional diffuser geometry and the frame of reference

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Figure 2

Experimental apparatus

Coefficient of static pressure for the 30 deg diffuser

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Figure 3

Coefficient of static pressure for the 30 deg diffuser

Coefficient of static pressure for the 40 deg diffuser

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Figure 4

Coefficient of static pressure for the 40 deg diffuser

Coefficient of static pressure for the 50 deg diffuser

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Figure 5

Coefficient of static pressure for the 50 deg diffuser

Axial velocity profiles for the 30 deg diffuser

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Figure 6

Axial velocity profiles for the 30 deg diffuser

Axial velocity profiles for the 40 deg diffuser

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Figure 7

Axial velocity profiles for the 40 deg diffuser

Axial velocity profiles for the 50 deg diffuser

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Figure 8

Axial velocity profiles for the 50 deg diffuser

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Kibicho K, Sayers AT. Benchmark Experimental Data for Fully Stalled Wide-Angled Diffusers. ASME. J. Fluids Eng. 2008;130(10):104502-104502-4. doi:10.1115/1.2969270.

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Benchmark Experimental Data for Fully Stalled Wide-Angled Diffusers

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