MULTIPLE JET IMPINGEMENT HEAT TRANSFER CHARACTERISTIC - EXPERIMENTAL INVESTIGATION OF IN-LINE AND STAGGERED ARRAYS WITH CROSSFLOW.

Extensive experimental results for heat transfer characteristics have been obtained for configurations designed to model the impingement cooled midchord region of air cooled gas turbine airfoils. The configurations tested were in-line and staggered two-dimensional arrays of circular jets with ten spanwise rows of holes. The cooling air was constrained to exit in the chordwise direction along the channel formed by the jet orifice plate and the heat transfer surface. Mean and chordwise resolved Nusselt numbers were determined utilizing a specially constructed test surface which was segmented in the chordwise direction. These are documented in tabular form as a function of mean jet Reynolds numbers and geometric parameters. The characteristics of these results are presented and discussed in graphical form.