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research-article

Experimental study on combined cooling method for porous struts in supersonic flow

[+] Author and Article Information
Gan Huang

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 10084, People's Republic of China
huangg13@mails.tsinghua.edu.cn

Yinhai Zhu

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 10084, People's Republic of China
yinhai.zhu@mail.tsinghua.edu.cn

Zhiyuan Liao

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 10084, People's Republic of China
lzy1313131@163.com

Taojie Lu

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 10084, People's Republic of China
822865666@qq.com

Peixue Jiang

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 10084, People's Republic of China
jiangpx@tsinghua.edu.cn

Zheng Huang

China State Shipbuilding Corporation, Haidian district, Beijing 10084, People's Republic of China
huangz10@cssc.net.cn

1Corresponding author.

ASME doi:10.1115/1.4037499 History: Received January 13, 2017; Revised June 12, 2017

Abstract

A combined transpiration and opposing jet cooling method was experimentally investigated for protecting porous struts with micro-slits in the leading edge. Schlieren images showed that this cooling method significantly affects the stability of the flow field and the profile of the detached shock wave. Three different states of flow fields were observed when increasing the coolant injection pressure of a strut having a 0.20-mm-wide micro-slit. The detached bow shock was pushed away by the opposing jet; it then became unstable and even disappeared when the coolant injection pressure was increased. Combined transpiration and opposing jet cooling could effectively cool the entire strut, especially the leading edge. The leading edge cooling efficiency increased from 3.5% for the leading edge without a slit to 52.8% for the leading edge with a 0.20-mm-wide slit when the coolant injection pressure was 0.55 MPa. Moreover, combined transpiration and opposing jet cooling with non-uniform injection distribution made the strut temperature distribution more uniform and caused the maximum temperature to decrease compared to standard transpiration cooling.

Copyright (c) 2017 by ASME
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