Cooling Effectiveness Of Impingement/Effusion Cooling With And Without Turbulence Promoter Ribs

In order to solve the cooling problem of aeroengine, a variety of highly efficient cooling methods came into application, such as effusion wall, impingement/effusion wall, etc. The impingement/effusion cooling methods with and without turbulence promoter ribs are introduced here. In the impingement/promoter ribs/effusion walls, turbulence promoter ribs are on the coolant side of effusion wall so as to enhance the internal cooling.Numerical and experimental approaches were taken to study cooling effectiveness of impingement/effusion liners cooling with and without turbulence promoter ribs. Cooling effectiveness of the two types cooling configurations were investigated on the same hot and cold air condition of inlet. Infrared camera was used to measure the temperature of effusion cooled surfaces on the side of hot main stream. The results showed double wall cooling with turbulence promoter ribs achieves higher cooling effectiveness than impingement/effusion cooling configurations.In addition, the two test configurations were investigated numerically to get clearer characterization of flow field in the double walls cooling configurations. High velocity vectors were found in the flow field within the gap of the double walls. A heat transfer enhancement was resulted in complex flows and increased area caused by the inclined holes and turbulence promoter ribs.