Heat Transfer on a Film-Cooled Rotating Blade Using aTwo-Equation Turbulence Model

International Journal of Rotating Machinery

卷:4

Vijay K. Garg¹ 

[1]AYT Corporation, NASA Lewis Research Center, 21000 Brookpark Road, Mail Stop 5-11, Cleveland 44135, OH, USA

关键词: Film cooling;    Turbine blade;    Turbulence models.;   

DOI  :  10.1155/S1023621X98000177

来源: DOAJ

【 摘 要 】

A three-dimensional Navier–Stokes code has been used to compare the heat transfer coefficient on a film-cooled, rotating turbine blade. The blade chosen is the ACE rotor with five rows containing 93 film cooling holes covering the entire span. This is the only filmcooled rotating blade over which experimental data is available for comparison. Over 2.278 million grid points are used to compute the flow over the blade including the tip clearance region, using Coakley's q-ω turbulence model. Results are also compared with those obtained by Garg and Abhari (1997) using the zero-equation Baldwin-Lomax (B-L)model. A reasonably good comparison with the experimental data is obtained on the suctionsurface for both the turbulence models. At the leading edge, the B-L model yields a bettercomparison than the q-ω model. On the pressure surface, however, the comparison betweenthe experimental data and the prediction from either turbulence model is poor. A potentialreason for the discrepancy on the pressure surface could be the presence of unsteady effects due to stator-rotor interaction in the experiments which are not modeled in the present computations. Prediction using the two-equation model is in general poorer than that using the zero-equation model, while the former requires at least 40% more computational resources.

【 授权许可】

Unknown