Francesco RENZULLI, Daniele RAPACCIUOLO, Rahman ABDUL, Antonella INGENITO, Sasi Kiran PALATEERDHAM

DOI Number: N/A

Conference number: HiSST-2025-325

The solid-fuel ramjet (SFRJ) motor is a favorable air-breathing propulsion system and a promising option for extending the speed and range of military applications such as ramjet-powered missiles. Owing to its simple structure, the SFRJ provides a reliable means of propulsion; however, operation at high altitudes introduces challenges such as ignition difficulty and blowout due to low ambient pressure. To address these issues, a wide range of solid fuels has been investigated, focusing on improving flammability and
enabling flexible manufacturing to meet structural requirements. Additive manufacturing (3D printing) offers significant advantages in this context by allowing precise control over grain geometry and internal fuel composition compared to conventional casting methods. In this work, polylactic acid (PLA) based solid fuels with different port geometries were fabricated using 3D printing and tested under an oxygen environment in a laboratory-scale hybrid rocket setup. The experimental campaign enabled the measurement of combustion chamber pressure, thrust, and fuel regression rate, providing insights into the performance characteristics of additively manufactured solid fuels and laying the groundwork for future
application in SFRJ engines.

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In Categories: 1.Events, 1.HiSST 2025, Propulsion Systems & Components
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