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| Numerical Study on Thermal Environment of a New Generation of Four-Parallel Rocket Engine Jet |
| ZHAO Yilin， YAN Li， LAI Xiaoyi， MA Luchuang， HOU Linxiao， YE Zhexiao |
| Aerospace System Engineering Shanghai， Shanghai 201109， China |
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Abstract For a new generation of launch vehicle using four-parallel liquid oxygen kerosene engine, FLUENT software is applied to study the influence of the engine jet on the thermal environment of rocket bottom. The study shows that: at low flight height, the jet flow interaction is weak; the backflow impacts the bottom center of the rocket at subsonic speed; and the air mole fraction in the backflow accounts for more than 90%. At high flight height, the backflow flows to the bottom plate at supersonic speed; The high-temperature jet gas in the backflow accounts for more than 50%. With the increase of flight height, the backflow point is closer to the vehicle afterbody, and the thermal environment of the afterbody is more severe. The maximum heat flux point at the bottom occurs at the height of about 21 km.
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Received: 22 August 2022
Published: 31 March 2023
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2023, Vol. 6 
