EFFECTS OF ROTATION ON BLADE SURFACE HEAT-TRANSFER - AN EXPERIMENTAL INVESTIGATION

Measurements of turbine blade surface heat transfer in a transient rot or facility are compared with predictions and equivalent cascade data. The rotating measurements involved both forward and reverse rotation (wake-free) experiments. The use of thin-film gages in the Oxford Roto r Facility provides bath time-mean heat transfer levels and the unstea dy time history. The time-mean level is not significantly affected by turbulence in the wake; this contrasts with the cascade response to fr ee-stream turbulence and simulated wake passing. Heat transfer predict ions show the extent to which such phenomena are successfully modeled by a time-steady code. The accurate prediction of transition is seen t o be crucial if useful predictions are to be obtained.