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Inicio Archivos Thermal Letter Funcionarios Reuniones futuras Assembly for International Heat Transfer Conferences

ISBN : 0-85295-345-3

International Heat Transfer Conference 10
1994, 14-18 August, Brighton, UK

Application of the Multiple-Time-Scale Turbulence Model to the Prediction of 2-D Film Cooling Effectiveness

DOI: 10.1615/IHTC10.1180
pages 125-130

Sinopsis

The paper presents a 2-D computation of film cooling effectiveness using the multiple-time-scale (M-T-S) turbulence model. The objective of the present study is to improve the prediction of the effectiveness at high mass flow ratios when the inequilibrium of the turbulence is significant. The M-T-S turbulence model by Kim and Chen (1989) is used to model the turbulence and the governing equations are solved by an elliptic solver with multi-grid enhancement. The near-wall turbulence is modelled using a low-Re k model with a refined grid. Computations are carried out at mass flow ratios of RM = 0.2, O. 4, O. 6. Comparison between computations and measurements shows that the M-T-S model gives overall better prediction of effectiveness than the k-ε model especially in the recovery region downstream of the separation bubble. Comparison between the computed and measured velocity profiles also shows good agreement. However, the results suggest that the treatment of near-wall turbulence in the separation bubble fails to account for the increased mixing in the region of separation and reattachment.