Volume 49 Issue S1
Sep.  2020
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Bao Xingdong, Yu Xilong, Wu Jie, Mao Hongxia, Wang Zhenhua, Xiao Zhihe. Numerical study of flow and ultra narrow spectrum infrared radiation characteristics of high-altitude plume under thin atmosphere[J]. Infrared and Laser Engineering, 2020, 49(S1): 20200159. doi: 10.3788/IRLA20200159
Citation: Bao Xingdong, Yu Xilong, Wu Jie, Mao Hongxia, Wang Zhenhua, Xiao Zhihe. Numerical study of flow and ultra narrow spectrum infrared radiation characteristics of high-altitude plume under thin atmosphere[J]. Infrared and Laser Engineering, 2020, 49(S1): 20200159. doi: 10.3788/IRLA20200159

Numerical study of flow and ultra narrow spectrum infrared radiation characteristics of high-altitude plume under thin atmosphere

doi: 10.3788/IRLA20200159
  • Received Date: 2020-03-04
  • Rev Recd Date: 2020-04-07
  • Publish Date: 2020-09-22
  • The Direct Simulation Monte Carlo method was used to describe the motion, collision and energy transfer effects of a finite number of simulated molecules. The non-equilibrium flow field characteristics of the high-altitude plume were calculated, and the macroscopic parameters of the plume were obtained by statistical average method. On this basis, the Voigt line function was used to describe the broadening of the thin gas, and line-by-line integration was used to obtain the narrow-spectrum gas radiation. The physical transform equation, combined with the backward Monte Carlo method, were used to calculate the radiation transfer equations of the high-altitude plume. The applicability of the flow and radiation calculation models was verified using theoretical and experimental data. The flow and narrow spectrum infrared radiation characteristics of a small thrust engine were calculated and analyzed by using the above model. The results show that:due to the rapid expansion of the high-altitude plume, the density decreases rapidly, which leads to a significant non-equilibrium effect; the gas is affected by the velocity inertia, and the gas of different molecular weights will have a diffusion separation effect; the gas spectrum is thin and narrow, with Doppler broadening, and the peak of radiation moves to the middle wave, 4.7 μm CO and 6.5 μm H2O emission band radiation energy account for a larger share. The radiance in the axis direction is concentrated within the distance of twice the diameter of the nozzle, while the radiance distributed in the radial direction is concentrated in the shock region and the inner flow region within the separation wave line, and the radiance in other regions decreases exponentially.
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    [10] Zhang Jianhua, Cai Guobiao. Computation based on the Simons model for vacuum plume[J]. Journal of Propulsion Technology, 2002, 23(5):406-409. (in Chinese)张建华, 蔡国飙. 用Simons法计算真空羽流[J]. 推进技术, 2002, 23(5):406-409.
    [11] Chen Bing, Cai Guobiao. Method of characteristics for vacuum plume simulation[J]. Journal of Propulsion Technology, 2002, 23(6):500-504. (in Chinese)陈兵, 蔡国飙. 模拟真空羽流场的特征线法[J]. 推进技术, 2002, 23(6):500-504.
    [12] Xiao Zejuan. A study of plume flow and its contamination of the space thrusters[D]. Shanghai:Shanghai Jiao Tong University, 2007. (in Chinese)肖泽娟. 空间发动机羽流及其污染研究[D]. 上海:上海交通大学, 2007.
    [13] Zheng Cailang, Zhu Dingqiang, Qiao Yaobin. Numerical simulation of the infrared radiation of orbit control thruster exhaust plume[J]. Journal of Astronautics, 2014, 35(5):521-527. (in Chinese)郑才浪, 朱定强, 乔要宾. 姿轨控发动机羽流红外辐射特性的数值仿真[J]. 宇航学报, 2014, 35(5):521-527.
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Numerical study of flow and ultra narrow spectrum infrared radiation characteristics of high-altitude plume under thin atmosphere

doi: 10.3788/IRLA20200159
  • 1. State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
  • 2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China;
  • 3. Science and Technology on Optical Radiation Laboratory, Beijing 100854, China

Abstract: The Direct Simulation Monte Carlo method was used to describe the motion, collision and energy transfer effects of a finite number of simulated molecules. The non-equilibrium flow field characteristics of the high-altitude plume were calculated, and the macroscopic parameters of the plume were obtained by statistical average method. On this basis, the Voigt line function was used to describe the broadening of the thin gas, and line-by-line integration was used to obtain the narrow-spectrum gas radiation. The physical transform equation, combined with the backward Monte Carlo method, were used to calculate the radiation transfer equations of the high-altitude plume. The applicability of the flow and radiation calculation models was verified using theoretical and experimental data. The flow and narrow spectrum infrared radiation characteristics of a small thrust engine were calculated and analyzed by using the above model. The results show that:due to the rapid expansion of the high-altitude plume, the density decreases rapidly, which leads to a significant non-equilibrium effect; the gas is affected by the velocity inertia, and the gas of different molecular weights will have a diffusion separation effect; the gas spectrum is thin and narrow, with Doppler broadening, and the peak of radiation moves to the middle wave, 4.7 μm CO and 6.5 μm H2O emission band radiation energy account for a larger share. The radiance in the axis direction is concentrated within the distance of twice the diameter of the nozzle, while the radiance distributed in the radial direction is concentrated in the shock region and the inner flow region within the separation wave line, and the radiance in other regions decreases exponentially.

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