Experimental investigation on heat transfer characteristics for arrays of circular jets impinging on curvilinear surface with crossflow and ejection holes

The effects of a curvilinear surface with ejection holes on the internal heat-transfer coeeficient of arrays of impinging jets have been investigated to simulate impingement-cooled turbine vanes. The experiments show that both the curvature of the surface and the presence of the ejection holes favor 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 the coefficient on a flate plate is more or less too conservative.