EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER CHARACTERISTICS FOR ARRAYS OF CIRCULAR JETS IMPINGING ON CURVILINEAR SURFACE WITH CROSSFLOW AND EJECTION HOLES

The effects of curvilinear surface with ejection holes on the internal heat transfer coefficient of arrays of impinging have been investigated for simulation of the impingement cooled turbine vanes. The experiments show that boththe curvature of the surface and the presence of the ejection holes are in favour of the heat transfer augmentation. It is noted that the internal impingement heat transfer coefficient on the suction side of the cooled blade calculated by using the correlation of that on flate plate is more or less too conservative.