Research on 3d cavity flow and its aero-optics phenomena
- Paper number
IAC-11,C2,7,18,x11064
- Author
Dr. Dinghua Feng, Xi'an Satellite Control Center, China
- Coauthor
Prof. Hua Li, National University of Defense Technology, China
- Coauthor
Dr. Zhengyu Tian, College of Aerospace and Materials Engineering, National University of Defense Technology, China
- Coauthor
Dr. Pan Sha, National University of Defense Technology, China
- Coauthor
Dr. Guo-hao DING, National University of Defense Technology, China
- Year
2011
- Abstract
When the vehicle which has optical seeker in its head side window fights at high speed in aerosphere, cavity flow phenomena occurs between optical equipment and coming flow, containing shock, shear layer, turbulence. And this causes complex flow phenomena with real gas effect, boundary layer separation induced by shock, interaction between inviscid flow and boundary layer, and so on. They will cause air density, temperature, composition changes, and even ionization of gas molecules, which will lead to optical imaging and detective system's aero-optics effects, including aero-thermal, thermal radiation, and image transmission distortion. Based on the background mentioned above, this work established high-precision LES/RANS hybrid algorithm model for solving supersonic flow firstly, and wrote program code with the capability of parallel calculation. Secondly, the self-built parallel computing platform based on PC cluster was used to study on Settles three-dimensional cavity supersonic flow, and got the speed type distributions and mass flow pulsations of shear layer region and reattachment zone. The calculation results were in good agreement with the experimental data. At last, on the basis of accurate numerical calculated flow field data, the optical transmission effect of the cavity shear layer region was researched. The results show that, the shear layer structure of cavity flow will cause light jitter, lead to severe wave front distortion and significantly reduced light intensity Strehl ratio, and greatly reduce the accuracy of the optical guidance.
- Abstract document
- Manuscript document
IAC-11,C2,7,18,x11064.pdf (🔒 authorized access only).
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