TY - JOUR
T1 - Experimental investigation on analogy principle of conjugate heat transfer for effusion/impingement cooling
AU - Xie, Gang
AU - Liu, Cun liang
AU - Niu, Jiajia
AU - Ye, Lin
AU - Wang, Rui
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/2
Y1 - 2020/2
N2 - The previous theoretical work has presented the importance of temperature ratios Tg/Tc in scaling overall cooling effectiveness and proposed several matching principles for scaling overall cooling effectiveness. These matching principles were experimentally validated on the flat plate with impingement/effusion cooling. Tested conditions included four temperature ratios (Tg/Tc = 1.1, 1.2, 1.3 and 1.98), three blowing ratios (M = 0.46, 0.9 and 1.8) and three momentum flux ratios (M = 0.1, 0.4 and 1.6). All cases had matched mainstream side Biot number and Reynolds number. The 2D contours of overall cooling effectiveness were measured by using IR thermography. The results indicate that matching momentum flux ratio provides acceptable matching performance of overall cooling effectiveness for combining effusion and impingement cooling scheme, in spite of the different temperature ratios among these cases. Different from the results of matching momentum flux ratio cases, decrease in temperature ratio is found to significantly increase the overall cooling effectiveness for matching blowing ratio cases. Similar matching results are also observed in pure effusion cooling scheme. Nevertheless, at small momentum flux ratio, this matching method is not recommended for pure effusion cooling scheme due to the notable influence of film cooling effectiveness on scaling overall cooling effectiveness.
AB - The previous theoretical work has presented the importance of temperature ratios Tg/Tc in scaling overall cooling effectiveness and proposed several matching principles for scaling overall cooling effectiveness. These matching principles were experimentally validated on the flat plate with impingement/effusion cooling. Tested conditions included four temperature ratios (Tg/Tc = 1.1, 1.2, 1.3 and 1.98), three blowing ratios (M = 0.46, 0.9 and 1.8) and three momentum flux ratios (M = 0.1, 0.4 and 1.6). All cases had matched mainstream side Biot number and Reynolds number. The 2D contours of overall cooling effectiveness were measured by using IR thermography. The results indicate that matching momentum flux ratio provides acceptable matching performance of overall cooling effectiveness for combining effusion and impingement cooling scheme, in spite of the different temperature ratios among these cases. Different from the results of matching momentum flux ratio cases, decrease in temperature ratio is found to significantly increase the overall cooling effectiveness for matching blowing ratio cases. Similar matching results are also observed in pure effusion cooling scheme. Nevertheless, at small momentum flux ratio, this matching method is not recommended for pure effusion cooling scheme due to the notable influence of film cooling effectiveness on scaling overall cooling effectiveness.
KW - Analogy theory
KW - Conjugate heat transfer
KW - Impingement/effusion cooling
KW - Overall cooling effectiveness
UR - http://www.scopus.com/inward/record.url?scp=85075534816&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2019.118919
DO - 10.1016/j.ijheatmasstransfer.2019.118919
M3 - 文章
AN - SCOPUS:85075534816
SN - 0017-9310
VL - 147
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
M1 - 118919
ER -