The primary objective of this study is to reveal the effect of oxidizer mass flow control for extinction-reignition, which is one of the useful points of hybrid rocket, for extending downrange and duration in the lower thermosphere. Swirling-flow oxidizer is furnished with solid fuel; we adopt polypropylene for solid fuel and liquid oxygen for oxidizer. A multidisci-plinary design optimization was implemented by using a hybrid evolutionary computation; data mining was carried out by using a scatter plot matrix to efficiently perceive the entire design space. It has been consequently revealed that simple control of oxidizer mass flow can fulfill extending both of downrange and duration. But they cannot be simultaneously achieved because we need the different design strategies between extending downrange and prolonging duration. Furthermore, intimate design strategies for the objectives have been indicated via the visualizations of trajectory data and of data mining result.
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