Performance analysis of dual mode nuclear thermal propulsion system based on SCO₂ brayton cycle

Dual-mode nuclear thermal propulsion system is an ideal power conversion system for future aerospace activities with both propulsion and power generation functions. In order to explore the coupling performance of the coupling of nuclear thermal propulsion system and the Brayton thermoelectric conversion module, based on the simple regenerative Brayton cycle, a nuclear thermal propulsion system is established, and a dual mode of propulsion module and power module is calculated and analyzed. The effect of cycle boost ratio, temperature rise ratio and compressor inlet temperature on the system thermal efficiency and exergy efficiency under power generation condition is studied. The results show that for the purpose of Mars exploration, the thrust and specific impulse meet the power requirements. The supercritical carbon dioxide (SCO₂) Brayton cycle is used as the system of the power generation module to analyze its performance. The cycle thermal efficiency is 32% and the exergy efficiency is 53% under the given parameters, which provides a reference for further analysis. (authors)