Turbine blade with tip rail cooling

摘要

A turbine rotor blade with a squealer pocket formed by tip rails on the blade tip. A row of tip cooling holes extend along an inner side of the tip rails on the pressure side and the suction side to provide cooling for the blade tip and limit leakage flow across the blade tip gap. A number of vortex flow blockers are positioned within the squealer pocket and extend from the tip rails and into the squealer pocket beyond the tip cooling holes to block any formation of vortex flow from the cooling air discharged through the tip cooling holes. The tip rail crown can be narrower such that a tip crown knife edge is formed. The tip cooling holes are slanted toward the tip rails to discharge cooling air toward the blade tip gaps.