Abstract
three leakage to mainstream mass flow ratios, 0.5%, 1% and 1.5% respectively. The contoured endwall geometry was generated to minimize stagnation and secondary aerodynamic losses. Transient IR (Infrared) thermography technique was applied to measure endwall surface temperature and calculation of simultaneous of heat transfer coefficient (HTC) and cooling effectiveness (ETA) was performed assuming a 1D semiinfinite transient conduction. Results show considerable reduction in area averaged HTC using the contoured endwall compared to baseline endwall with different levels of coolant MFRs, whereas, significant reduction was achieved for cases without coolant flow and without purge slot. A decrease in HTC values near the leading edge region was prominent comparing with and without purge slot cases for respective geometries. The backward facing step seems to have a significant impact on endwall HTC distribution rather than with coolant blowing cases.
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