Unsteady Simulation of a Transonic Turbine Stage with Focus on Turbulence Prediction

Abstract

The flow in a transonic turbine stage still poses a high challenge for the correct prediction of turbulence using an eddy viscosity model. Therefore, an unsteady RANS simulation with the k-ω SST model, based on a preceding study of turbulence inlet conditions, was performed to see if this can improve the quality of the flow and turbulence prediction of an experimentally investigated turbine flow. Unsteady Q3D results showed that none of the different turbulence boundary conditions could predict the free-stream turbulence level and the maximum values correctly. Luckily, the influence of the boundary conditions on the velocity field proved to be small. The qualitative prediction of the complex secondary flows is good, but there is lacking agreement in the prediction of turbulence generation and destruction.

Excellence in Turbomachinery Research: The Best of the 14th European Turbomachinery Conference

“…In about one year of open access the average abstract view and full manuscript download rate is appreciably over one thousand, while the average citation rate is 1.2 (data not shown), a remarkable result indeed. [6]) prevail over a compressor study (Lamidel et al [7]), while attention has been paid to turbulence modelling and measurements (Marioni et al [8] and Sanz et al [9]). Advanced turbine heat transfer concepts also been dealt through experimental and numerical studies (Wambersie et al [10], Trompoukis et al [11]).…”

“…Many of them have either been internally supported by the contributing organizations or have been funded by their National Research Agencies. Turbine aerodynamic and aero-acoustic studies (Brind and Pullan [2], Al-am et al [3], Franke et al [4], Foret et al [5], Gaetani et al[6]) prevail over a compressor study (Lamidel et al[7]), while attention has been paid to turbulence modelling and measurements (Marioni et al[8] and Sanz et al[9]). Advanced turbine heat transfer concepts also been dealt through experimental and numerical studies (Wambersie et al[10], Trompoukis et al[11]).…”