Effect of V-shaped ribs on film cooling characteristics of trailing-edge cutback

YE Lin; LIU Cunliang; YANG Yuquan; HUANG Rong; ZHU Andong

doi:10.7527/S1000-6893.2020.24181

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2021 , Vol. 42 >Issue 6: 124181 - 124181

DOI: https://doi.org/10.7527/S1000-6893.2020.24181

Fluid Mechanics and Flight Mechanics

Effect of V-shaped ribs on film cooling characteristics of trailing-edge cutback

YE Lin ,
LIU Cunliang ,
YANG Yuquan ,
HUANG Rong ,
ZHU Andong

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1. School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China;
2. Shaanxi Key Laboratory of Thermal Sciences in Aero-engine System, Northwestern Polytechnical University, Xi'an 710129, China

Received date: 2020-05-05

Revised date: 2020-07-13

Online published: 2020-08-31

Supported by

National Natural Science Foundation of China (51776173); Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (CX201913)

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Abstract

The influence of the V-shaped ribs on the film cooling characteristics of the trailing-edge cutback is studied using the pressure-sensitive paint technology and the transient thermochromic liquid-crystal technology. The distributions of the film cooling effectiveness and heat transfer coefficients on different cutback surfaces with varying V-shaped rib widths at varying blowing ratios are obtained. The heat flux ratio is adopted to evaluate and compare the overall cooling performance of the turbulated cutback surfaces with V-shaped ribs. The experimental results show that the addition of V-shaped ribs has an adverse effect on the film coverage on the unexpanded surface. At low blowing ratios, the rib width has no significant effect on the area-averaged film cooling effectiveness. For the cases with the same rib width, the film cooling effectiveness of the unexpanded surface is always higher than that of the expanded surface. The effect of the V-shaped rib width on the heat transfer enhancement of the trailing-edge cutback is not obvious. The V-shaped ribs exhibit a stronger heat transfer performance on the unexpanded surface than that on the expanded surface. Compared with the primeval trailing-edge cutback, the net heat flux reduction of the case with V-shaped ribs can significantly increase by a factor of 6.9%-26.6%, and the width has no significant effect on the wall heat flux. At low blowing ratios, it is advisable to use V-shaped ribs on the unexpanded surface, while unnecessary to consider the shape of the trailing-edge cutback at high blowing ratios.

Key words： trailing-edge cutback; V-shaped rib; film cooling; heat transfer enhancement; pressure sensitive paint technique; transient thermochromic liquid-crystal technique

Cite this article

YE Lin , LIU Cunliang , YANG Yuquan , HUANG Rong , ZHU Andong . Effect of V-shaped ribs on film cooling characteristics of trailing-edge cutback[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021 , 42(6) : 124181 -124181 . DOI: 10.7527/S1000-6893.2020.24181

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