| Summary: | 碩士 === 國立中興大學 === 機械工程學系 === 86 === The gas-pressured waterjet rocket makes use of high pressure
air as its power source, it can attain high thrust power by
consuming less energy. Compared with the traditional rocket, it
has more advantages, such as simpler structure, lower cost,
better energy efficiency, and etc. Until now, there is no
accurate propulsive theory for gas-pressurized waterjet rocket.
In order to improve its propulsive efficiency, here we take
advantages of Lagrangian Reynolds transport equation, momentum
equation, total kinetic power produced by the rocket engine, and
propulsion power analysis equations developed by Hsing-Juin Lee.
Accordingly, we use computer to simulate and analyze the flight
dynamics of gas-pressurized waterjet rocket, thus to aid its
design and test for higher altitude. Additionally, this type of
gas-pressurized waterjet rocket model includes abundant testing
parameters, such as internal flow unsteadiness, acceleration of
rocket, gas/water proportion, and etc, to provide versatile
applications like analysis, testing and instruction. This type
of rocket not only has high education value, but also has the
advantages of convenience, safety and environmental protection.
Furthermore, because the waterjet rocket has no heat loss, so
its propulsive efficiency is the same as its overall efficiency.
As the computational result shows that when the propellant
(water) absolute velocity approaches zero, its simplified
propulsive efficiency is nearly perfect. Herein, we further use
generalized propulsive equation to extend the more manipulation
space of design parameters. In the future, we may design nozzles
with changeable size and curvature to increase its propulsive
efficiency. In this paper, we also modify the propulsive
efficiency equation to accommodate the situation of the burning
out of fuel. Moreover, we may try the design of bursting a small
amount of gun-powder to produce high inner pressure to further
increase system performance. In addition, we may try the design
of a nil-smoke antitank missile, trench mortar, the waterjet
rocket carrying life-saving ropes for high-rise building fire
accident, or water-shell artillery, and etc.
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