Subscripts 1HE ROLE OF THE IMPINGEMENT PLATE IN ARRAY HEAT TRANSFER

96-GT-162 - The Society shall not be responsible for statements or opinions advanced in papers or discussion at meetings of the Society or of its Divisions orSections, or printed in its publications. Discussion is printed only if the paper is published in an ASME Journal. ABSTRACT Most research involving ways of impinging jets was conducted using steady state techniques which allow the impingement plate (through which the gas flows) to achieve an equilibrium (adiabatic) temperature during the test. Invariably, the impingement plate temperature was not reported for these tests as the floating temperature condition was taken to be representative of conditions in the application being modeled. Thermal analysis of gas turbine conditions showed the present authors that conditions in the engine could often be significantly different from this floating plate temperature state. Such conditions include engine operating point transients and situations in which the plate is fixed to the aerofoil in such a way to achieve good thermal contact. Furthermore, the capacity of the impingement plate to contribute to enhanced heat transfer by paying attention to the thermal boundary conditions at its support has not been realized. The influence of the impingement plate temperature on local target surfeit heat transfer was fully quantified b