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>Enhanced Solid Fuel Regression in a Hybrid Rocket Employing Additively Manufactured Fuels Exhibiting Novel Grain Port Geometries
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Enhanced Solid Fuel Regression in a Hybrid Rocket Employing Additively Manufactured Fuels Exhibiting Novel Grain Port Geometries
Static-fired hybrid motor experiments were conducted to investigate the enhancement in regression rate and propulsive performance resulting from use of additively manufactured solid fuel grains exhibiting novel grain port geometries. Convoluted flow paths which accelerate/decelerate flow, protrusions from the grain port which produce flow recirculation zones and induce turbulence, and generation of swirl-inducing geometries, are all possible configurations that are not easily achieved using conventional casting techniques. Swirl-ellipse port geometries in polycarbonate yielded a 65% increase in regression rate (measured at the grain exit) and a 13% increase in C* efficiency relative to the cylindrical center-ported baseline geometry. Under similar oxidizer flow conditions, the swirl-ellipse port geometry in poly(methyl methacrylate) exhibited approximately 116% increase in regression rate and minimal enhancement in conversion efficiency.
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