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What are the IR radiation characteristics of the exhaust plume of a liquid rocket engine?

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The infrared (IR) radiation characteristics of the exhaust plume of a liquid rocket engine have been studied in several papers. The plume's IR radiation properties are influenced by factors such as the thermodynamic state of the plume, propellant composition, flight altitude, and flight Mach number. The plume's IR radiation can be accurately modeled using methods that calculate narrow-band radiation properties and incorporate radiative transfer calculations . The number of engine nozzles and the detection angle can be determined based on the plume's IR imaging characteristics . The plume's afterburning significantly affects its IR radiation in the 1.5-6.0 μm wavelength range, and atmospheric attenuation affects the plume's radiance at low altitudes . The plume's spectral structure is complex, with different gases contributing to different spectral bands . These studies provide insights into the design of rocket motors and the application of infrared detecting systems .

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Proceedings Article•DOI Numerical simulation of infrared spectrum and radiance characteristics of rocket engine exhaust plume Xingdong Bao, Mao Hongxia, Xu Ying, Zhenghua Wang, Dong Yanbing - Show less +4 more 07 Nov 2018 2 Citations	The paper provides a detailed analysis of the infrared radiation characteristics of the exhaust plume, including the spectral radiation characteristics of H2O, CO2, CO, and HCL in the 2μm to 8.6μm band.
Journal Article•DOI Numerical analysis of point-source infrared radiation phenomena of rocket exhaust plumes at low and middle altitudes Qinglin Niu, Xinhu Duan, Xiaying Meng, Zhihong He, Shikui Dong - Show less +4 more 01 Jun 2019-Infrared Physics & Technology 25 Citations	The paper discusses the infrared radiation characteristics of Atlas-II liquid rocket plumes, including the effects of afterburning, atmospheric attenuation, spectral bands, and observation angle.
Journal Article•DOI Narrow-band infrared radiation characteristics of rocket exhaust plume by using correction function related to thermodynamic state Pedro Marcondes 01 Sep 2022-Infrared Physics & Technology	The paper discusses the accurate modeling of infrared radiation of rocket plume, including the effects of propellant formulation, flight altitude, and flight Mach number. However, specific characteristics of the exhaust plume of a liquid rocket engine are not mentioned in the paper.
Journal Article•DOI Infrared radiation characteristics of liquid oxygen/kerosene rocket engine plume with different number of nozzles Hong-Hua Cai, Wan-Sheng Nie, Su Lingyu, Shi Tianyi, Kangkang Guo - Show less +4 more 28 Apr 2019-Spectroscopy Letters 3 Citations	The paper discusses the infrared radiation characteristics of a liquid oxygen/kerosene rocket engine plume, including the use of different spectral bands for clearer plume structure imaging.

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