Modeling and Optimization of Turbine-Based Combined-Cycle Engine Performance

Title of Thesis: Modeling and Optimization of Turbine-Based Combined-Cycle Engine Performance Joshua Clough, Master of Science, 2004 Thesis Directed By: Prof. Mark Lewis Aerospace Engineering The fundamental performance of several TBCC engines is investigated from Mach 05. The primary objective of this research is the direct comparison of several TBCC engine concepts, ultimately determining the most suitable option for the first stage of a two-state-to-orbit launch vehicle. TBCC performance models are developed and optimized. A hybrid optimizer is developed, combining the global accuracy of probabilistic optimization with the local efficiency of gradient-based optimization. Trade studies are performed to determine the sensitivity of TBCC performance to various design variables and engine parameters. The optimization is quite effective, producing results with less than 1% error from optimizer repeatability. The turbinebypass engine (TBE) provides superior specific impulse performance. The hydrocarbon-fueled gas-generator air turborocket and hydrogen-fueled expandercycle air turborocket are also competitive because they may provide greater thrust-toweight than the TBE, but require some engineering problems to be addressed before being fully developed. MODELING AND OPTIMIZATION OF TURBINE-BASED COMBINED-CYCLE ENGINE PERFORMANCE

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