Experimental and numerical investigations to extend the validity range of a turbine loss correlation for ultra-low aspect ratios in transonic flow

Authors

A. Beschorner, K. Vogeler - Technical University Dresden
E. Goldhahn, M. Huhnd - Airbus, Bremen, Germany

Abstract

The target of the investigation presented in this paper was to develop a loss correlation for ultra-low aspect ratio turbine blades, with validity in the transonic flow regime. A set of public correlations has been used as a basis for the validity range extension. The database for the correlation development has been created by the results of 3D CFD computations. The numerical model has been validated by experimental investigations in a newly designed transonic testrig with pneumatic and optical measurement methods. The comparison between the computed and the measured cascade results showed good conformance. Finally the paper will present the necessary modifications to the complete set of correlations to meet the computed loss coefficients of the CFD database.