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Jet engine spare parts are expensive. Hence, for economic reasons, as many components as possible should be repaired. For planning the repair or regeneration process, defects must be identified early. The present paper explores whether the detection and examination of inhomogeneities in the temperature distribution in an exhaust gas stream of a jet engine can be used for the identification and localization of defects before engine disassembly. In order to be able to assign the defects to the resulting temperature non-uniformity in the exhaust gas, the mixing characteristics of the temperature inhomogeneities in the turbine caused by the defects are examined. A three-dimensional unsteady CFD-simulation of a whole turbine with a complex temperature distribution at the inlet is carried out. The simulations show, that the temperature inhomogeneities are barely mixed out with the surrounding flow. To describe the mixing effects a coefficient (turbine mixing factor) is derived. The factor enables an integral assessment of the mixing behaviour of inhomogeneities within and outside of turbine stages.

Time Resolved Full-Annulus Computations of a Turbine with Inhomogeneous Inlet Conditions