An improved statistical narrow band(I-SNB)model was proposed in this study to calculate the infrared radiation characteristics of the rocket engine plumes.This model can discretize the spectral lines within a narrow band in a non-uniform mode,thus the discretized spectral lines perform similar behaviour when temperature and concentration change simultaneously to adapt to the highly non-uniform plume flow field.The modelling accuracy of the I-SNB model has been evaluated using FTIR reference measurement spectral data and line-by-line(LBL)benchmark solutions,and the results show that the accuracy is significantly better than that from the traditional statistical narrow-band(SNB)model.Based on the American Atlas 5 launch vehicle configuration and combining the rocket flight ballistic parameters in the boost stage,the infrared spectral radiation characteristics of rocket engine plumes in the boost stage were studied.The calculated band range was respectively from 2.0 to 5.0 μm and 8.0 to 12.0 μm.The calculated spectral radiation characteristics included spectral radiation intensity,characteristic band radiation image and integrated radiation intensity.This study provides the oretical support for space-based infrared early warning system for booster phase interception.
rocket motorinfrared spectral radiationplumerocket boostnarrow band model
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