11th European Conference on Turbomachinery Fluid dynamics & Thermodynamics

Paper ID:

ETC2015-134

Main Topic:

AXIAL TURBINES

Authors

R. Ciorciari - Institute of Jet Propulsion, Universität der Bundeswehr München, Germany
I. Kirik - Institute of Jet Propulsion, Universität der Bundeswehr München, Germany
R. Niehuis - Institute of Jet Propulsion, Universität der Bundeswehr München, Germany

Abstract

The effects of unsteady incoming wakes on the secondary flow in a linear low pressure turbine cascade, named T106, were investigated by experiments in a high speed cascade wind tunnel and by U-RANS simulations. In this paper, results of a variety of cases with different Strouhal numbers and flow coefficients were compared and the differences analysed. The upstream incoming wakes in the experiment were generated by a wake generator and were considered in the CFD simulations likewise. The computations have been conducted using the flow solver TRACE. Time-averaged and time-accurate ensemble averaged experimental data permit the evaluation of the numerical U-RANS predictions for some of the investigated con- figurations. 3D CTA hot-wire traverses downstream the cascade permit to analyse the velocity and the turbulent flow field for the investigated configurations. Results of a newly implemented fast response total pressure probe allow to compare the relative unsteady ensemble averaged fluctuations to the CFD results downstream of the cascade.



ETC2015-134




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