Prediction of by-pass transition by means of a turbulence weighting factor-Part II: Application on turbine cascades

Abstract

To simulate transitional heat transfer experiments in turbine cascades, the conditionally averaged Navier-Stokes equations are used. To cover both the physics of freestream turbulence and the intermittent flow behaviour during transition, a turbulence weighting factor τ is used. A transport equation for this factor, constructed for low Mach number flows, is extended to cope with compressibility. Compressibility in combination with turbulence level and pressure gradient are prime factors for the correct evaluation of the transitional zone. The method is validated on transitional heat transfer measurements in a linear turbine cascade at typical operational conditions.