基于雷诺应力输运模型的气膜冷却效率预测标通量模型修正研究

To address the inherent limitations of conventional two-equation turbulence models，particularly their failure to account for anisotropic turbulence effects，which leads to inadequate flow field predictions and no⁃ tably exaggerated cooling effectiveness estimations along the centerline of film-cooling，the Reynolds Stress Mod⁃ el（RSM）has been used to further consider the flow anisotropy. The prediction results of different turbulence models RSM and Shear-Stress Transport Model（SST）are compared，which shows that the accuracy of flow ve⁃ locity prediction is improved due to the fact that the RSM is more effective in capturing the anisotropic properties of Reynolds stress. Based on RSM，a high-order generalized gradient diffusion hypothesis（HOGGDH）is intro⁃ duced to address the insufficient diffusion of gradient diffusion hypothesis（GDH）in the prediction of the spatial temperature field. The calculated results are compared with the experimental values. The results indicate that the modified model based on RSM for the prediction of film cooling efficiency has a good agreement with the ex⁃ periment for different film hole shapes，blow ratio，and density ratio. Additionally，the relative prediction accu⁃ racy has improved by approximately 32% compared to the traditional two-equation model.