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摘要
Exhaust plume from the rocket engine produced strong infrared radiation signals, widely used for target detecting and identifying. For a model solid rocket motor, the Euler Discrete Phase model was used to describe the interaction between gases and solid particles. The detailed chemical reaction mechanism was used to calculate the afterburning in the plume. Based on the line by line integration method and Mie theory, the gases and solid particles radiation properties were solved. The radiation transmission was calculated by the light of sight method, and the applicability of the model was verified by the measured data. The effects of different flight heights on the gas-solid two-phase plume flow and radiation characteristics were simulated. The results show that: as the height increases, the interaction between the gas and the solid particles in the plume is weakened, and the larger the particle size, the greater the difference between the particles and the gas. The two-phase plume is affected by the difference in mixing and afterburning effects at different heights, resulting in significant differences in temperature and concentration of different gases. The radiation spectrum at each height exhibits a gas selective emission spectrum structure. The contribution of high temperature Al2O3 to radiation is mainly concentrated in short waves, and the higher the height, the smaller the influence. The radiation characteristics between different bands are affected by the emission bands of different gases, and the radiation peaks of the two main emission bands of 2.7μm and 4.3μm may appear at different flight heights.
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单位高温气体动力学国家重点实验室; 中国科学院大学
