Patent attributes
A turbine blade with a squealer tip having a cooling circuit formed from a number of rows of multiple impingement cavities that extend across the blade tip from the pressure side wall to the suction side wall. One of the impingement cavities (main impingement cavity) in each row is connected to a cooling pressure supply channel through a main metering and impingement hole. The remaining impingement cavities in the row is either a pressure side impingement cavity or a suction side impingement cavity, and each are connected to the main impingement cavity through secondary metering and impingement holes. The impingement cavities located on the ends and adjacent to the side walls of the blade tip are connected top film cooling holes. Cooling air from the supply channel flows through the main metering and impingement holes and into the main impingement cavities, then flows into the pressure side impingement cavity or cavities through the secondary metering and impingement holes or through the pressure side impingement cavities through the secondary metering and impingement holes. At the last cavity adjacent to the walls, the cooling air flows through the film cooling holes to discharge from the blade tip.
