Measurement and calculation of nozzle guide vane end wall heat transfer

A three-dimensional steady viscous finite volume pressure correction method for the solution of the Reynolds-averaged Navier-Stokes equations has been used to calculate the heat transfer rates on the end walls of a modern Hig h Pressure Turbine first-stage stator. Surface heat transfer rates have bee n calculated at three conditions and compared with measurements made on a m odel of the vane tested in annular cascade in the Isentropic Light Piston F acility at DERA, Pyestock. the NGV Mach numbers, Reynolds numbers, and geom etry are fully representative of engine conditions. Design condition data h ave previously been presented by Harvey and Jones (1990). Off-design data a re presented here for the first time. In the areas of highest heat transfer , the calculated heat transfer rates are shown to be within 20 percent of t he measured values at all three conditions. Particular emphasis is placed o n the use of wall functions in the calculations with which relatively coars e grids (of around 140,000 nodes) can be used to keep computational run tim es sufficiently low for engine design purposes.