標題: | Investigation of boundary layer thickness and turbulence intensity on film cooling with a fan-shaped hole by direct numerical simulation |
作者: | Fu, Wu-Shung Chao, Wei-Siang Tsubokura, Makoto Li, Chung-Gang Wang, Wei-Hsiang 機械工程學系 Department of Mechanical Engineering |
關鍵字: | Film cooling;Direct numerical simulation;Boundary layer thickness;Turbulence intensity |
公開日期: | 1-八月-2018 |
摘要: | Effects of the mainstream boundary layer thickness and the turbulence intensity on film cooling under low Reynolds number conditions are studied in this work by the direct numerical simulation (DNS). In other to solve low-speed compressible flow problems, several methods of Roe scheme, preconditioning, dual time stepping, and LUSGS are adopted to solve governing equations. Results reveal that a horseshoe vortex appears with a thicker mainstream boundary layer, and thus the lateral coverage of the coolant fluid has increased significantly. In addition, the existence of turbulence intensity eliminates the blow-off phenomenon, which happens in a thin mainstream boundary layer condition and enhances the film cooling effectiveness. |
URI: | http://dx.doi.org/10.1016/j.icheatmasstransfer.2018.05.017 http://hdl.handle.net/11536/148009 |
ISSN: | 0735-1933 |
DOI: | 10.1016/j.icheatmasstransfer.2018.05.017 |
期刊: | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER |
Volume: | 96 |
起始頁: | 12 |
結束頁: | 19 |
顯示於類別: | 期刊論文 |