Impact of Cooling Injection on Transonic Over-Tip Leakage Flow and Squealer Aerothermal Design Optimization

The present study has numerically investigated the effect of cooling injection on the Over-Tip-Leakage (OTL) flow and squealer designs in a transonic flow regime. A series of quasi-3D analyses were carried out to understand the cooling jet - OTL flow interaction at various hole locations and inclination angles. The results indicate that the rankings between flat and squealer tip designs might be altered by the addition of cooling injection. Full 3D conjugate analyses demonstrate that partially replacing the squealer cavity with a flat shape in the transonic flow regime would offer a much improved coolablility without paying extra aerodynamic penalty.Copyright © 2014 by ASME