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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 17 of 17 for “"liquid rocket"”.
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Dynamic models for liquid rocket engines with health monitoring application
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Theoretical Analysis of Transpiration Cooling of a Liquid Rocket Thrust Chamber Wall
… of an actively cooled thrust chamber wall of a liquid rocket engine by up to 50% when compared to other active cooling techniques, increasing the thrust to weight ratio of the rocket engine. In this thesis, mathematical models and computer codes were developed for simulating the flow of a …
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Determination of the nose cone shape for a large reusable liquid rocket booster
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Analysis of a heavy lift launch vehicle design using small liquid rocket engines
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Development, testing, and validation of a heat transfer model for bi-propellant liquid rocket engines
… heat transfer characteristics in a bi-propellant liquid rocket engine is a time and resource intensive process. The highly unpredictable and turbulent nature of the combustion requires complex modeling to predict the temperatures and fluid properties. These properties are required to evaluate …
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Early Plume Development and NOx Chemistry in LOx/H₂ and LOx/CH₄ Liquid Rocket Engines
Projected rocket launch demand in the next 10 years predicts an order-of-magnitude increase in CO₂-equivalent gasses. Despite this expected increase in launch frequency, the on-Earth environmental impacts of off-Earth missions is still understudied, partially due to the lack of combustion and …
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Effectiveness of integration of system-level optimization in concurrent engineering for rocket design
… further study was carried out. A two-stage liquid rocket software model was created to serve as a complex multi-disciplinary design problem. Several design session trials were run with the goal of optimizing the rocket in performance and cost. Some design teams used optimization along with …
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Preliminary design of a 1 kN liquid propellant rocket engine testing platform
This work presents a preliminary design of a liquid rocket engine test platform to support research into liquid propulsion systems and rocket engine components, including injectors, ignition systems, combustion chambers and engine cooling systems. The liquid propellants, specifically liquid oxygen …
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Reduced Order Modeling of a Rocket Engine Turbopump Inducer for Assessment of Pogo Instability
Cavitation in liquid rocket engine turbopump inducers can lead to system instabilities. One form of these flow oscillations is so-called "pogo instability", in which dynamic instability arises from the interaction of vehicle structural dynamics with thrust oscillations of a liquid fueled propulsion …
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The benefit of precise chemical shift and concentration referencing in NMR applications
… and signal-intensity calibrations in liquid-state and solid-state NMR applications. Absolute concentration calibrations are an essential part for quantitative NMR investigations. For concentration calibrations, a number of parameters must be optimized prior to conducting quantitative …
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Cooling performance of storable propellants for a micro rocket engine
… studies the selection of propellants for a liquid regeneratively cooled micro rocket engine focusing on the characterization of their cooling performance. Propellants will be at high pressures and under high heat fluxes in the cooling passages and will be supercritical. A summary of the …
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Thermoacoustic Effects of a Variable Equivalence Ratio in a Single Element Methane Combustor
… in limiting the progress and innovations of liquid rocket engines and power plants. Under certain operating conditions, unsteady heat release and acoustic wave interactions can couple and lead to instabilities, such as self-sustaining pressure oscillations, that can lead to reduced combustor …
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Numerical investigation of the combustion of liquid oxygen droplets in an environment of hydrogen under microgravity conditions
… more effective and better cryogenic powered liquid rocket engines, it is vital to undertake further studies to better understand the behavior of the LOX/LH2 system. This work studies the configuration of a single liquid oxygen droplet surrounded by gaseous hydrogen diluted with helium. A …
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Micro-scale turbopump blade cavitation
… for the use in a micro-fabricated bipropellant liquid rocket engine is of interest. Such a pump might have airfoils on the order of 1mm chord and 0.2mm span and operate at a Reynolds number of 6000. Cavitation is a major technical issue in such a pump, but there is little work in the literature …
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Effects of Tip Clearance and Surface Roughness on Small-Scale Turbopump Impeller Performance
… turbopump impellers typically used in liquid rocket engines of small launch vehicles suffer from reduced performance due to manufacturing challenges and nonuniform geometric scaling. This thesis aims to characterize the impact of impeller blade tip clearance and surface roughness on the …
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Numerical Modelling of LOX Droplet Combustion in Hydrogen under Micro-gravity Conditions
One of the most frequent liquid rocket propellant configurations is LOX/LH2. Specifically,since this fuel/oxidizer mixture produces an extremely high specific impulse (Isp) with only water vapor as an exhaust. This makes LOX combustion research critical for improving combustion efficiency and …
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Numerical Simulations of Multi-Confined Jets in Crossflow at Supercritical Pressure
… and 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 …