Numerical Investigation on Hybrid Rocket Motors with Star-Segmented Rotation Grain

A novel fuel grain configuration comprising two star-segmented grains is proposed. The effect of the rotation, mid-chamber length, and segmented position on regression rate combustion efficiency in hybrid rocket motors with investigated this paper. To end, 90% hydrogen peroxide (H2O2) hydroxyl-terminated polybutadiene (HTPB) are selected as propellant combination research. Three-dimensional numerical simulations conducted. firing test a lab-scale motor was conducted to verify accuracy model, errors between simulation data experimental results no more than 4.5%. case without regarded base case. demonstrate that flow field structure could be ameliorated by rotation configuration. Compared case, aft-section has little fore-section grain, while average increases, maximum increase 25.04%. higher length 40 mm 1/2 raised 4.06%. those during entire period operation, increased 1.40–4.21% operation. research findings paper can provide valuable guidance for performance improvement star grain.