Numerical study of nozzle erosion in a hybrid rocket motor with wagon wheel fuel grain

Abstract Nozzle erosion directly affects the design quality of hybrid rocket motors, and it is a critical issue that restricts practical application motors. In this paper, coupled numerical simulations combustion flow field thermochemical graphite nozzle in motor with multi-port wagon wheel fuel grain are carried out. The results indicate distributions temperature, species rate show symmetrical characteristics related to shape. decreases at first then increases convergent section throat insert, reaches maximum value transition arc between straight throat. rates central hole (position A) outer edge holes B) 0.0625 mm/s 0.0902 mm/s, respectively. slowly gradually divergent section. Circumferentially inhomogeneous ablation occurs throat, front end varies from 0.0484 0.0809 mm/s. main oxidizing causing H 2 O OH. At position A section, caused by OH 66.50% 30.48%, With increase oxidizer mass rate, chamber pressure linearly, increases, but growth decreases.