Effect of Surface Curvature on Heat Transfer and Hydrodynamics Within a Single Hemispherical Dimple

[+] Author and Article Information
N. Syred, A. Khalatov

Department of Mechanical Engineering and Energy Studies, School of Engineering, Cardiff University, P.O. Box 685, The Parade, Cardiff CF23 3TA, United Kingdom

A. Kozlov

Department of Power Engineering, Kazan Scientific Centre, Russian Academy of Sciences, P.O. Box 190, City of Kazan, 420503, Russia

A. Shchukin, R. Agachev

Department of Aeroengines, Chair of Turbomachinery, Kazan State Technical University (KAI), 10 K. Marx St., City of Kazan, 420111, Russia

J. Turbomach 123(3), 609-613 (Feb 01, 2000) (5 pages) doi:10.1115/1.1348020 History: Received February 01, 2000
Copyright © 2001 by ASME
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Turbine blade cooling passage with hemispherical surface dimples in a leading edge area (concave wall; possible design)
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Test section: (1) straight rectangular passage; (2) curved passage; (3) flow turbulator; (4) dimple
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Average static pressure coefficient in a dimple “pole” versus curvature parameter: open symbols-dimple on a concave wall; close symbols-dimple on a convex wall
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Local Stanton number distributions: lengthwise meridian cross section of a dimple. Re=2.2×105: open symbols=dimple on a concave wall; closed symbols=dimple on a convex wall. (1) dimple on a flat plate; (2) δ/R=0.2×10−3; (3) 0.44×10−3; (4) 1.1×10−3; (5)=1.7×10−3; (6) 2.2×10−3; (7)=3.5×10−3; (8) 5.2×10−3; (9) 6.9×10−3;lx=distance in streamwise direction.
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Average Stanton number in a “curved” dimple; Red=u0d /ν; designations: Fig. 4
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Relative Stanton number: (1) concave wall; (2) convex wall; curves: smooth curved surface [correlations (1) & (2)]; dots: dimpled curved surface (present experiments)
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Summarizing of experimental data: dimple on a concave or convex surface; solid line: single dimple on a flat plate
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Average relative heat transfer rate: various configurations; δ**/R=2×10−3,Red=8×104




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