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The Mira 2 Rocket Engine: Applying Lessons Learned for an Improved Iteration

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https://ir.library.oregonstate.edu/concern/graduate_projects/76537857k

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  • In this paper, I present the design of Mira 2, a small-scale, liquid bipropellant rocket engine, with a specific focus on its oxidizer-centered pintle injector. Building upon the valuable lessons and insights gained from the empirical testing of its predecessor, Mira 1, the Mira 2 engine incorporates several improvements and advancements. The design objectives of the engine encompass several key topics: simplified component geometries with more efficient assembly methods; greater control of injected flow uniformity, a more deterministic method of controlling annular orifice concentricity; and a heightened emphasis on thermal considerations for the components in an oxidizer-rich combustion zone. I provide a detailed description of a pintle injector rocket engine sizing tool, developed specifically for this research. This tool facilitates the generation of preliminary injector geometry values, which can then be refined through empirical testing into a more coherent design. The validation of this sizing tool is then demonstrated by comparing tool flow predictions to computational fluid dynamics simulations. The presented structural analyses are accompanied by a set of design criteria requirements with the intention of ensuring a positive capability margin despite realistic uncertainty.
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  • Sizing Script for an Ox-centered, Jet-A/LOx Pintle Injector Engine
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