| Summary: | 碩士 === 國立中興大學 === 機械工程學系 === 88 === Abstract
The gas-pressurized waterjet rocket is a new product characterized with originality, interest, exercise, science and environmental friendliness in addition to education and fun. Its recent popularity is due to minimal cost, easiness of acquiring the propellant ( air and water ) and changing design. News media show that there are various models of gas-pressurized waterjet rocket. Traditional theory is not good enough to analyze these cases, because it lacks proper concepts and equations of total kinetic power. In that respect, the dynamics laboratory of National Chung-Hsing University currently leads the advanced research trend. While take advantages of Lagrangian Reynolds transport equation, momentum equation, total kinetic power, available propulsion power, and thrust power, we can make a more complete, clear, natural and systematic analysis of waterjet rocket. In this research, we enhance flight performance by improving its propulsive efficiency. In that sense, we develop the gun/waterjet rocket by the idea of farmer transplanting rice seeds. It features a long rod extruding from launcher deep into the rocket mainbody to increase initial rocket velocity on launching. Further, we analyze the flight dynamic of gun/waterjet rocket by solving the momentum and total kinetic power equation simultaneously to predict the flight histogram, computationally, and convolutionally. In this approach, we thoroughly solve the complicated internal flow field with the aid of conservation laws and isentropic process. The analysis results are reasonably agreeable to the experimental flight data. Meanwhile it proves the correctness of our theory and numerical simulation. The gun/waterjet rocket is a good model with minimal cost for demonstrating propulsion theory, it may have the potential for propelling the smokeless antitank missile and associated technology in the future.
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