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RESEARCH PAPERS

Flow Distributions and Discharge Coefficient Effects for Jet Array Impingement With Initial Crossflow

[+] Author and Article Information
L. W. Florschuetz, Y. Isoda

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

J. Eng. Power 105(2), 296-304 (Apr 01, 1983) (9 pages) doi:10.1115/1.3227415 History: Received December 14, 1981; Online September 28, 2009

Abstract

Two-dimensional arrays of circular air jets impinging on a 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 impingement surface. In addition to the crossflow which originates from the jets following impingement, an initial (independent) crossflow is present which 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. Experimentally determined row-by-row streamwise distributions of the jet and crossflow velocities are presented for ratios of the initial crossflow rate to the total jet flow rate ranging from zero to unity. Comparisons are drawn between the measured flow distributions and a theoretical model which is presented. Effects of crossflow velocity and impingement surface proximity on jet hole discharge coefficients are also presented and discussed.

Copyright © 1983 by ASME
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