TY - JOUR
T1 - Investigation of boundary layer thickness and turbulence intensity on film cooling with a fan-shaped hole by direct numerical simulation
AU - Fu, Wu Shung
AU - Chao, Wei Siang
AU - Tsubokura, Makoto
AU - Li, Chung Gang
AU - Wang, Wei Hsiang
N1 - Funding Information:
The authors would like to acknowledge the support of the Ministry of Science and Technology of Taiwan (MOST), Grant No. 105-2917-I-009-007 and the support of the Riken Advanced Institute for Computational Science of Japan .
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/8
Y1 - 2018/8
N2 - 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.
AB - 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.
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U2 - 10.1016/j.icheatmasstransfer.2018.05.017
DO - 10.1016/j.icheatmasstransfer.2018.05.017
M3 - Article
AN - SCOPUS:85048385680
SN - 0735-1933
VL - 96
SP - 12
EP - 19
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
ER -