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| Accurate Modeling of Infrared Spectral Radiation Characteristics
of Rocket Engine Plume During Boost Phase |
| WANG Biao1，2， BAI Lu3， LI Jinlu1，3， GUO Xing1， WU Jiaji1 |
| 1. School of Electronic Engineering，Xidian University， Xi’an 710071， Shaanxi， China；2. National Key Laboratoryof Scattering and Radiation， Shanghai 200438， China；3. School of Physics， Xidian University，Xi’an 710071， Shaanxi， China |
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Abstract 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.
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Received: 20 November 2023
Published: 25 July 2024
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2024, Vol. 7 
