| Citation: | LI Xintian, CAI Qiang, LI Yancheng, et al. Research on wagon-wheel fuel grain parametric design and internal ballistics performance of hybrid rocket motor[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(4): 724-730. doi: 10.13700/j.bh.1001-5965.2019.0314(in Chinese)
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The study of fuel grain design and internal ballistic performance can provide the foundation for the design and optimization of hybrid rocket motor. Fuel grain design and internal ballistics calculation process and method of hybrid rocket motor were established. Based on the fuel regression rate law, the variation relationships of burning area and fuel port area with fuel thickness of the wagon-wheel fuel grain were obtained. For certain design specifications and propulsion system scheme, fuel grain schemes were designed for wagon-wheel fuel grain with central port, wagon-wheel fuel grain without central port, double-D fuel grain, and tube fuel grain. The calculation results show that wagon-wheel fuel grain can provide larger burning area, higher propellant loading fraction, and lower length-to-diameter ratio. For tube fuel grain, variations of oxidizer-to-fuel ratio, combustion pressure and thrust with time are much less. Decreasing the fuel diameter can increase the propellant loading fraction of tube and double-D fuel grains. However, the length-to-diameter ratio increases at the same time. The results can provide a good support for the understanding of the internal ballistic characteristics and laws of hybrid rocket motors with wagon-wheel fuel grain.
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