The aerothermal performance of turbine blade squealer tip at various Reynolds numbers and Mach numbers with moving endwall

Abstract

Abstract The changes of operating conditions can lead to variations in the aerodynamic conditions of the turbine blades. Then numerical studies are conducted to study the aerothermal performance of the turbine blade with a squealer tip at various Reynolds numbers (Re) and exit Mach numbers (Ma) with moving endwall. Besides, the effect of the rim height on the squealer tip is studied. The increasing of Reynolds numbers at Mach number = 0.78 enhances the heat-transfer at the tip of blade entirely, however, it has little impact on the leakage flow of the blade tip. The total heat flux increases with Mach number increasing from 0.78 to 0.96 and changes slightly with a further increasing of Mach number at a design Reynolds numbers. The height of squealer rim affects the tip leakage flow in the cavity and tip leakage vortex, and then affects the heat transfer distribution and the heat load of the blade tip.