The secondary air system is of crucial importance for the overall performance, life and reliability in modern aero engines. The prediction of flows, pressures, temperatures and heat transfer must be as accurate as possible to allow any overall efficiency improvements to be achieved. To support this improvement, a framework of research projects has been set up, funded by the german government, called Engine3E, where the 3’E’ reflect Efficiency, Economy and Environment. This project concentrates on the core engine components of gas turbines. In the area of the high pressure turbine, a set of projects deal with detailed investigations in the area of the secondary air system with respect to engine performance and reliability. This paper will present a subset of these projects including results and partial exploitation of the results into the daily design work. This work was done in close cooperation between RRD and the University of Karlsruhe respectively the North Western Polytechnical University of Xi’an in China.
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