Reduced order design space analysis and operational mapping for ramjet engines

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Ramjet propulsion is often favored for powering supersonic vehicles cruising at speeds exceeding Mach 3. Despite the relatively simple geometric design of these engines compared to turbo-based alternatives, the complex flow physics involved makes their design and optimization challenging. Hence, the design and performance analysis of ramjet engines are crucial to ensure that the propulsion system meets the demands of the flight trajectory. To address this, a design and analysis methodology using zero-and-one dimensional models, Busemann intakes, and detailed chemistry approach is applied to explore the design space of ramjet engines. By investigating design parameters across a wide range of operational conditions, a multi-dimensional data matrix is generated. Employing a sensitivity analysis technique referred to as Shapley Additive Explanations (SHAP) framework, the propulsive performance characteristics under various operational and design conditions are discussed.