Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Rocket Propulsion"”.
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Development, modeling and testing of a slow-burning solid rocket propulsion system
… per second. A small, fast aircraft requires a propulsion system which is both miniature and high-power, requirements which current UAV propulsion technologies do not meet. To meet this need, a slow-burning solid rocket motor has been developed. Such motors require slow-burning solid propellants …
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Improving the thermal shock resistance of zirconium diboride ceramics
… in ultra-high temperature environments (i.e. rocket propulsion and hypersonic flight) will be required to maintain structural integrity despite the extreme temperatures and heating rates associated with these applications. The fundamental hypothesis of this Ph.D. study is to determine if the …
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Development of Lattice-Augmented Fuels for Hybrid Rocket Applications
Hybrid rocket propulsion systems, which utilize a solid fuel and liquid oxidizer, are among the safest and simplest rocket propulsion systems that can be developed. Despite these attractive qualities, the commercialization of the technology has been slow due to difficulties associated with scaling …
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The Influence of Mixing Duct Length and Phase of Flight on Wall Temperatures of a Rocket Based Combined Cycle Engine in Ejector and Air-Augmented Modes
<p>Rocket Based Combined Cycle (RBCC) engines have been theorized as a possible means of powering launch vehicles and high-speed atmospheric vehicles. By incorporating aspects of both air-breathing and rocket propulsion, RBCC engines promise up to a 230 % increase in specific impulse over …
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Development of a cold gas propulsion system for the TALARIS hopper
… lunar and other planetary surfaces. It has two propulsion systems: (1) a system of four electric ducted fans to offset a fraction of Earth's gravity (e.g. 5/6 for lunar simulations), and (2) a cold gas propulsion system which uses compressed nitrogen propellant to provide impulsive rocket …
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Developing Evaluation Measures for the Second Stage Next Generation Engine on Evolved Expendable Launch Vehicles
… space lift, the current U.S. second stage liquid propulsion engine, the RL10 (developed in 1958) needs to be replaced. This replacement requires systems engineering methods and new technological advances to adhere to mission requirements and constraints of current platforms. This thesis provides a …
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Towards Electrical Control Over Rocket Propellant Combustion
… the functionality and performance of various propulsion systems. In solid rocket motors, active burn rate modulation has the potential to enable throttling. In spacecraft propulsion systems, electrolysis of propellants may provide a means to reduce energy requirements and eliminate the need …
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Hybrid Rocket Motor Scaling Process
<p>Hybrid rocket propulsion technology shows promise for the next generation of sounding rockets and small launch vehicles. This paper seeks to provide details on the process of developing hybrid propulsion systems to the academic and amateur rocket communities to assist in future research and …
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Increased confidence in concept design through trade space exploration and multiobjective optimization
… tools. The first is an air-launched sounding rocket propulsion system design. The second is the design of a responsive disaster monitoring system. In each case, the use of the Engineering Framework and concept design tools give the designer increased confidence that quality concept designs …
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A flexible, modular approach to integrated space exploration campaign logistics modeling, simulation, and analysis
… the ten launches and in-space nuclear thermal rocket propulsion required to send a crew of four to the surface of Mars for a 531-day exploration. Finally, a usability experiment is presented to demonstrate the usability and efficiency of the SpaceNet tool as compared to independent analysis …
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Novel Gel-Infused Additively Manufactured Hybrid Rocket Solid Fuels
In the aerospace propulsion sector safety is an important driver to costs, vehicle design and mission capabilities. Hybrid rockets are considered some of the safest forms of chemical propulsion. That factor alone makes hybrid rocket propulsion systems desirable options. Hybrid systems often benefit …
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Investigation on Ammonium Perchlorate Based Electrically Controlled Propellants
An experimental study exploring the ignition behavior of an electrically controlled gel monopropellant (ECGP) composed of an ionically conducting liquid polymer (polyethylene glycol) and ammonium perchlorate (AP) was conducted. Complexation of AP with PEG enabled ion transport when a voltage was …
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Comparison of Cation-Anion Oxidizer Pairings in Electrically Controllable Solid Propellants
… the lack of throttle-ability in solid propellant rocket motors. Existing studies have focused on propellants compositions using hydroxyl-ammonium nitrate, ammonium nitrate, or lithium perchlorate as oxidizers. Additionally, the thermochemical and electrochemical reaction mechanisms have not yet …
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Characterization of Electrically Controlled Gel Polymer Electrolyte Monopropellants
Increasing interest in the development of nontoxic monopropellants for the replacement of hydrazine and its derivatives stems from the desire for safer and thus more cost-effective alternatives. Ionic liquid monopropellants based on the hydroxylammonium nitrate and ammonium dinitramide ionic …
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Numerical Simulations of Multi-Confined Jets in Crossflow at Supercritical Pressure
… landing of an aircraft, and core fluid of liquid rocket engine pre-burner. The Reynolds Averaged Navier Stokes (RANS) equations were solved using k-ε and k-ꞷ turbulence models for two and three confined perpendicular jets at 180 and 120 degrees respectively from each other, injecting liquid …
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Development of a High Performance Micropropulsion System for CubeSats
… activities to be possible, a high performance propulsion system is required. The goal of this thesis is to design and test an affordable, safe, and effective micro-propulsion system for CubeSats.