本文首先采用CFD—FASTRAN软件对RAM—CII钝锥体试验飞行器热化学非平衡绕流场参数进行了模拟分析，其次采取多温度模型结合逐线法获得非平衡绕流场吸收、发射系数，最终采用视在光线法LOS对RAM—CII飞行器全流场光辐射特性进行了模拟，分析表明：头部激波层紫外（02—0．4Dm）辐射最强，要比尾迹流区高3个数量级以上，正侧向观测辐射强度比迎头观测时要大接近1个数量级；同一方向不同高度总的光谱辐射亮度差别不大，但正侧向观测的光谱辐射亮度比迎头方向观测略大；绕流场红外（2～5μm）辐射以C02分子2．7、4．3μm谱带发射为主，但总体上看红外光谱辐射亮度相较于紫外要小3个数量级。
In this paper, the thermo-chemical non-equilibrium flow filed of RAM-CII blunted cone was simulated with CFD-FASTRAN, then the absorption and enfissive coefficients of the non-equilibrium flow filed were gotten by the multi-temperature mode and line-by-line method. At last, the LOS method was used to simulate the radiation characteristics of the flow field around the blunted cone. The results showed that the strongest UV radiation (0.2-0.4 μm) intensity of the shock layer is at the nose of the blunted cone, which is three orders stronger than that of the wake, and the radiation in the side direction is nearly one order bigger than that in the head-direction. The total radiative intensity of the flow field at different heights is not far-off in the same direction, and the radiative intensity in the side direction is a little lager than that in the head-direction. The IR radiation (2-5 μm) of the flow field focus on the 2.7 μm and 4.3 μm band of the CO2 molecular and in the whole the IR radiative intensity is three orders smaller than UV radiation.
参考文献
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| [2] | Denis Packan;Christophe O. Laux;Richard J. Gessman;Laurent Pierrot;Charles H. Kruger .Measurement and Modeling of OH, NO, and CO_2 Infrared Radiation at 3400 K[J].Journal of thermophysics and heat transfer,2003(4):450-456. |
| [3] | T. Ozawa;M. B. Garrison;D. A. Levin .Accurate Molecular and Soot Infrared Radiation Model for High-Temperature Flows[J].Journal of thermophysics and heat transfer,2007(1):19-27. |
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