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Acta Aeronautica et Astronautica Sinica ›› 2024, Vol. 45 ›› Issue (16): 129818-129818.doi: 10.7527/S1000-6893.2023.29818

• Fluid Mechanics and Flight Mechanics • Previous Articles    

Influence of catalyst bed structure on performance of HAN⁃based monopropellant engine

Dechuan SUN1,2(), Guoqiang ZHANG2, Tianliang YAO3, Liang GUAN3   

  1. 1.State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,China
    2.School of Mechanics and Aeronautics and Astronautics,Dalian University of Technology,Dalian 116024,China
    3.Shanghai Institute of Space Propulsion,Shanghai 201112,China
  • Received:2023-11-01 Revised:2023-11-07 Accepted:2023-12-25 Online:2024-01-05 Published:2024-01-04
  • Contact: Dechuan SUN E-mail:dechuans@dlut.edu.cn
  • Supported by:
    Program of Shanghai Academic/Technology Research Leader(22XD1422000)

Abstract:

The influence of catalyst bed length and cavity defects on the engine operation process was investigated for a Hydroxylamine Nitrate (HAN)-based monopropellant engine. Numerical simulations were conducted to examine the steady-state operation and startup process of a 300 N engine using porous media assumption, the Volume of Fluid (VOF) model, and the propellant decomposition model. The results indicate that increasing the length of the front bed contributes to performance improvement. By increasing the front bed length from 30 mm to 40 mm, the specific impulse in vacuum is enhanced by 2.7%. However, increasing the length of the front bed leads to a slower response. This not only reduces the pressure and temperature values at the end of the gas filling stage by 6.7% and 12.5% respectively, but also increases the pressurization time caused by the catalyst bed heating. Cavity defects significantly reduce engine performance. When the front bed length is 40 mm, the 5 mm cavity reduces the vacuum specific impulse by 15%.

Key words: hydroxylamine nitrate, catalytic bed structure, liquid-monopropellant rocket engine, stead-state process, start-up process

CLC Number: