Abstract
The conjugate calculation technique is used for the three-dimensional heat transfer, internal flow, and external flow calculation of a film-cooled test blade of a modern gas turbine. The comparison with thermal index paint experiments shows that with respect to the thermal load a qualitatively good agreement of the conjugate results and the measurements can be found. The 3-D analysis permits to take into account the influence of off-design flow conditions, which lead to a shifting of the stagnation line, on the film cooling at the leading edge. The numerical simulation of the complex internal passage flow is also part of the investigation. It can be shown that a homogeneous distribution of the cooling air on the cooling holes is reached. Nevertheless, the interaction of the cooling jets with secondary flow phenomena of the passage flow can lead to cooling fluid displacement and, thus, to a local degradation of the cooling performance.
