Heat Transfer Characteristics for Jet Array Impingement With Initial Crossflow

[+] Author and Article Information
L. W. Florschuetz, D. E. Metzger, C. C. Su

Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, Ariz. 85287

J. Heat Transfer 106(1), 34-41 (Feb 01, 1984) (8 pages) doi:10.1115/1.3246656 History: Received January 03, 1983; Online October 20, 2009


Two-dimensional arrays of circular air jets impinging on a heat transfer surface parallel to the jet orifice plate are considered. The jet flow, after impingement, is constrained to exit in a single direction along the channel formed by the jet orifice plate and the heat transfer surface. In addition to the crossflow that originates from the jets following impingement, an initial crossflow is present that approaches the array through an upstream extension of the channel. The configurations considered are intended to model the impingement cooled midchord region of gas turbine airfoils in cases where an initial crossflow is also present. A major objective is determination of the effect of initial crossflow air temperature relative to jet array air temperature on impingement surface heat fluxes. Dimensionless adiabatic wall temperatures and Nusselt numbers resolved to one streamwise jet hole spacing were experimentally determined for ratios of initial crossflow rate to total jet flow rate ranging from zero to unity. These results are presented and discussed relative to the flow and geometric parameters.

Copyright © 1984 by ASME
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