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Numerical simulation of film cooling effect and aero-optical effect of optical window
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Paper Abstract

Supersonic cooling film can reduce the influence of aerodynamic heating to a certain extent, but the complex flow field structure formed by its interaction with the mainstream will cause imaging target offset, ambiguity and jitter, that is, aero-optical effect. In this paper, the variation of cooling efficiency and aero-optical effect at the optical window under different jet States is studied numerically, and the validity of the numerical method is verified by comparing the experimental results. The results show that the cooling efficiency at the optical window is higher and the aero-optical effect is smaller because of the proper total temperature of the cooling jet; The higher the supply pressure of cooling gas, the better the cooling efficiency of film cooling. In order to ensure the weakest aero-optical effect, the cooling gas supply is in pressure matching state; With the increase of Mach number of cooling gas injection, the cooling efficiency and aero-optical effect of supersonic film cooling increase; In general, nitrogen or air is chosen as cooling gas.

Paper Details

Date Published: 18 December 2019
PDF: 13 pages
Proc. SPIE 11338, AOPC 2019: Optical Sensing and Imaging Technology, 113380C (18 December 2019); doi: 10.1117/12.2541395
Show Author Affiliations
Haoxi Xiong, National Univ. of Defense Technology (China)
Shihe Yi, National Univ. of Defense Technology (China)
Haolin Ding, National Univ. of Defense Technology (China)
Xiwang Xu, National Univ. of Defense Technology (China)
Yang Si, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 11338:
AOPC 2019: Optical Sensing and Imaging Technology
John E. Greivenkamp; Jun Tanida; Yadong Jiang; HaiMei Gong; Jin Lu; Dong Liu, Editor(s)

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