TY - JOUR
T1 - Study of utilizing double lateral sub holes at different spanwise angles on blade film cooling effectiveness
AU - Fawzy, Hamza
AU - Zheng, Qun
AU - Jiang, Yuting
AU - Lin, Aqiang
AU - Ahmad, Naseem
AU - Malik, Adil
AU - Yousef, Khaled
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/10
Y1 - 2020/10
N2 - A numerical study of the effect of using double lateral sub-holes at different span-wise angles on flow structure and film-cooling performance is performed. The lateral angles for each sub-hole change from 10° to 20° at the same film-hole diameter (12.7 mm) and jet angle (35°). The flow-field analysis and the performance of film-cooling for the double lateral sub-hole models are investigated comparing with the basic single-hole model. There are high augmentations in the overall effectiveness of film-cooling by 14.2%, 26.5%, and 37.2% for the first, the second, and the third double lateral sub-hole models, respectively when the blowing ratio increases from 0.5 to 1.0. By evaluating the film-cooling performance for the third double lateral sub-hole model compared to the basic model, there is an increasing ratio in the overall effectiveness by 54.2% and 149.5% for the low and high ratio of blowing, respectively. Consequently, the third double lateral sub-hole model can be selected as the best model among the other models and by further operating at a broad range of blowing ratios from 0.25 to 3.5, the model achieves a maximum value of overall film-cooling effectiveness of 44% at an optimum value of blowing ratio 2.5.
AB - A numerical study of the effect of using double lateral sub-holes at different span-wise angles on flow structure and film-cooling performance is performed. The lateral angles for each sub-hole change from 10° to 20° at the same film-hole diameter (12.7 mm) and jet angle (35°). The flow-field analysis and the performance of film-cooling for the double lateral sub-hole models are investigated comparing with the basic single-hole model. There are high augmentations in the overall effectiveness of film-cooling by 14.2%, 26.5%, and 37.2% for the first, the second, and the third double lateral sub-hole models, respectively when the blowing ratio increases from 0.5 to 1.0. By evaluating the film-cooling performance for the third double lateral sub-hole model compared to the basic model, there is an increasing ratio in the overall effectiveness by 54.2% and 149.5% for the low and high ratio of blowing, respectively. Consequently, the third double lateral sub-hole model can be selected as the best model among the other models and by further operating at a broad range of blowing ratios from 0.25 to 3.5, the model achieves a maximum value of overall film-cooling effectiveness of 44% at an optimum value of blowing ratio 2.5.
KW - Double lateral sub-holes
KW - Effectiveness of film cooling
KW - Jet lift-off
KW - Lateral angle
KW - Span-wise angle
UR - http://www.scopus.com/inward/record.url?scp=85087277182&partnerID=8YFLogxK
U2 - 10.1016/j.icheatmasstransfer.2020.104728
DO - 10.1016/j.icheatmasstransfer.2020.104728
M3 - 文章
AN - SCOPUS:85087277182
SN - 0735-1933
VL - 117
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
M1 - 104728
ER -