Abstract
Slow regression rate of hybrid rocket fuel is a disadvantage which should be overcome. One of the solutions is usage of a solid fuel grain with a complicated geometry port. Especially, the recent development of additive manufacturing leads to promote the complication of port geometry. An engineer is required to understand a fuel regression behavior, when one designs a solid fuel grain with a complicated geometry port. Hence, in this research, the numerical tool for capturing a solid fuel surface is developed with level set method. The regression of a star-shape port with five and six slots is simulated with the developed numerical tool. The regression distance at the forward end of the port is very large in the both case of port. The fuel regression rate increases downstream, except for the forward end, in the both case of port. The oxidizer to fuel ratio of a star-shape port with five slots is larger than that of a star-shape port with six slots.
