Simulation of transonic flows through a turbine blade cascade with various prescription of outlet boundary conditions

Petr Louda,Jaromír Příhoda,Petr Straka,P Dančová

doi:10.1051/epjconf/201818002056

Abstract

The contribution deals with the numerical simulation of transonic flows through a linear turbine blade cascade. Numerical simulations were carried partly for the standard computational domain with various outlet boundary conditions by the algebraic transition model of Straka and Příhoda [1] connected with the EARSM turbulence model of Hellsten [2] and partly for the computational domain corresponding to the geometrical arrangement in the wind tunnel by the γ-ζ transition model of Dick et al. [3] with the SST turbulence model. Numerical results were compared with experimental data. The agreement of numerical results with experimental results is acceptable through a complicated experimental configuration.

Highlights

The problem of the shock-wave/boundary-layer interaction is studied in the long term the majority of results are focused on the interaction with the turbulent boundary layer
Numerical simulations were carried out for transonic flow through a linear turbine blade cascade corresponding to a rotor mid-section of the last stage of a large output steam turbine
The used transition model and its implementtation into the in-house numerical code are described in detail by Louda et al [17]. The both transition models i.e. the EARSM turbulence model connected with the algebraic transition model and the SST turbulence model with the - transition model were applied for the numerical simulation of 2D transonic flow through a linear turbine blade cascade corresponding to a rotor mid-section of the last stage of a large output steam turbine

Summary

Introduction

The problem of the shock-wave/boundary-layer interaction is studied in the long term the majority of results are focused on the interaction with the turbulent boundary layer. The structure of the transonic flow through a turbine blade cascade considerably depends on the character of the shock-wave/boundary-layer interaction. Existing simulations of transonic flows through a linear turbine blade cascade have shown a rather significant dependence of results on the prescription of the outlet boundary condition, i.e. outlet static pressure. Due to the relatively complicated geometrical arrangement of the test section with the immediately connecting settling chamber, the outlet of the computational domain is usually prescribed in the traversing plane behind the blade cascade where the static pressure is given on the basis of mean values of measured data. There were realized numerical simulations partly for the computational domain corresponding to the geometrical arrangement of the wind tunnel by the -

Mathematical model

Results

Conclusions