UNSTEADY SIMULATIONS OF A TRAILING-EDGE SLOT USING MACHINE-LEARNT TURBULENCE STRESS AND HEAT-FLUX CLOSURES

Abstract

The trailing edge slot is a canonical representation of the pressure-side bleed flow encountered in high pressure turbines. Predicting the flow and temperature downstream of the slot exit remains challenging for RANS and URANS, with both significantly over predicting the adiabatic wall effectiveness. This over prediction is attributable to the incorrect mixing prediction in cases where the vortex shedding is present. In case of RANS the modelling error is rooted in not properly accounting for the shedding scales while in URANS the closures account for the shedding scales twice, once by resolving the shedding and twice with the model for all the scales. Here, we present an approach which mode..