Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
Hybrid rockets use different phases of oxidizer and fuel as propellants to generate thrust. Hybrid rockets have advantages over conventional rockets, such as higher safety, lower cost, and the ability to restart. However, they have the disadvantage of lower thrust compared to conventional type rockets. The authors conducted static fire test, using different fuel axial lengths and fuel geometries. For the fuel, poly methyl methacrylate (PMMA) is used in the former comparison, while PMMA and paraffin wax (PW) are used in the latter comparison. The experimental results show that the shorter fuel has better thrust characteristics in the comparison of fuel axial lengths. This will be explained by the increased length of the aft-combustion chamber, which promotes combustion. In the comparison of fuel geometry show that the hexagonal radial-hole fuel has better thrust characteristics. This will be explained by the larger time-averaged mass flow rate of fuel, it is about 4 times larger for the hexagonal radial-hole fuel than the single port fuel.
