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.

Download it! Paper is available for download