Abstract
The sequence of hybrid rocket motor static firings is performed, with and without cylindrical protrusion, to evaluate the combustion behavior of bee-wax fuel grain. Firing is done for the injection pressures of 2.75 bar, 4.15 bar, and 5.51 bar, respectively, all firings are done for an identical firing duration of 7 seconds. Experimental outcome confirms the addition cylindrical protrusion as vortex generator yield an average of 45% higher regression rate than that of the baseline rocket motor. Among all injection pressures, modest 4.15 bar with cylindrical protrusion shows a significant improvement in the combustion performance by exhibiting the enhanced regression rate as well as mass consumption rate of the fuel grain. Hence, the addition of cylindrical protrusion as a vortex generator to the classical hybrid motor promise to improve the combustion performance of the bee-wax fuel grain.
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