Study of an Impingement Cooling Jet Array for Turbine Blade Cooling With Single and Double Exit Cases
A study was conducted on convective heat transfer of a 55 impingement jet array (5×11) with a constant heat flux boundary condition. A spatial variation in a time-averaged Nusselt number, as well as a spanwise time-averaged Nusselt number, are presented for jet Reynolds numbers of 4,000, 8,000, 12,000, and 15,000 for jet to target standoff distances of z/D = 3, 4 and 5. For each of these configurations the exit flow was varied to include both a single exit and a double exit configuration. In all cases, the computed Nusselt number correlates well with the experimentally measured results. The local and spanwise averaged Nusselt number distributions are presented as a function of the jet Reynolds number. Several complex heat transfer and flow phenomena were clarified through extensive computational investigation by using CFD analyses.