Large-Eddy Simulations of flow and heat transfer around a low-Mach number turbine blade

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.810
pages 741-752

Nicolas Maheu
INSA of Rouen, avenue de l’Université; CORIA (CNRS UMR6614), Site Universitaire du Madrillet, BP 12, 76801 Saint-Etienne-du-Rouvray Cedex, France

Vincent Moureau
CORIA CNRS - INSA et Universite de Rouen Site du Madrillet - BP 8 76801 Saint Etienne du Rouvray, France

Pascale Domingo
CORIA - CNRS & INSA Rouen, BP 8, 76801 Saint-Etienne-du-Rouvray, France

Abstract

Large-Eddy Simulation of the flow around a low-pressure turbine blade is presented for a Reynolds number of 150,000 based on the chord length and the outlet velocity, and a turbulence intensity of 5.8% at the inlet. These simulations aim at investigating turbulent heat transfer at the blade wall. The simulations are validated by comparing the mean velocity field and the Nusselt number at the wall against experimental measurements. The Nusselt number, which is directly estimated with the gradient of the resolved temperature, approaches experimental data for mesh resolutions close to DNS requirements. An advanced post-processing methodology based on a level set function is presented, which allows to compare the velocity profile at the suction side with the universal law of the wall. This novel highly resolved database will allow to elaborate new heat transfer and boundary models for realistic turbulent flows.