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 13 of 13 for “"Advanced Propulsion"”.
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Advanced propulsion for microsatellites
… microsatellite missions require considerable propulsion capabilities, miniaturization of the propulsion subsystem is critical in the design of most miniature spacecraft. A broad range of existing propulsion technologies have been considered for the purpose of identifying those devices which …
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Development of high-speed laser diagnostics for the study of advanced propulsion systems
Combustion in next-generation high-speed propulsion systems involves highly turbulent reactive flow conditions, often beyond the limits of our physicochemical understanding. It is a challenge to produce reliable combustion as localized extinction and instabilities are highly transient in nature. It …
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Modeling and Experimental Measurements of Laser-Sustained Hydrogen Plasmas
Laser propulsion is an advanced propulsion concept especially applicable to orbital transfer vehicles. As an alternative to combusting fuel and oxidizer, the concept utilizes a remote laser beam as a source of power. A laser sustained plasma (LSP) is the medium by which power is absorbed by the …
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Verification and Validation of Open-Source Simulation Tools for Supersonic Aircraft Aerodynamic Analysis
… to test new aerospace technologies, such as advanced propulsion systems or large sensor payloads, require major modifications to conventional, large-scale, manned, supersonic airframe design. High-fidelity numerical simulation of these concepts in academic settings often requires the use of …
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Strategies for affordable human Moon and Mars exploration
… by NASA, without the need for investments in advanced propulsion options such as nuclear thermal or electric propulsion. The affordability of the lunar campaign would be enhanced greatly by the use of dedicated cargo flights for lunar outpost deployment, in contrast with NASA's current plan to …
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Application of a Non-intrusive Optical Non-spherical Particle Sizing Sensor at Turboshaft Engine Inlet
… mass flow rate is necessary. Our team with the Advanced Propulsion and Power Laboratory developed a non-intrusive optical sensor that is able to characterize non-spherical particles. This sensor has been used in various applications through the years; however, most recently, the sensor has been …
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CLOSeSat : Perigee-lowering techniques and preliminary design for a small optical imaging satellite operating in very low earth orbit
… processes and tools are utilized to analyze advanced concepts of low perigee systems and reduce the useful perigee boundary of satellite orbits. The feasibility and utility of such designs are evaluated through the use of the Satellite System Design Tool (SSDT), an integrated approach using …
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Design and acoustic shielding prediction of hybrid wing-body aircraft
… engines, and the N2B aircraft with a distributed propulsion system embedded in the airframe. The initial performance assessment shows that the N2A and the N2B aircraft can both meet the N+2 fuel burn goal and that the N2A aircraft is 5.7 EPNdB short of the noise goal. Also, the assessment revealed …
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Impact of Liquefied Natural Gas usage and payload size on Hybrid Wing Body aircraft fuel efficiency
… for simultaneous optimization of airframe/propulsion/operations. Due to cabin aisle height restrictions, unusable white" space for the H1 designs resulted in excessive empty weight fractions. However the design achieves 45% lower fuel burn than the B737-800 due to its all lifting …
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The Effect of Thermal Non-Uniformity on Coherent Structures in Supersonic Free Jets
… on a heated supersonic jet at the Virginia Tech Advanced Propulsion and Power Laboratory. A converging-diverging nozzle with a diameter Reynolds number of 850,000 was used to generate a perfectly expanded, heated flow of Mach 1.5 and a nozzle pressure ratio (NPR) of 3.67. The unheated plume was …
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Study of Lean Blowout Limits and Effects of Near Blowout Oscillations on Flow Field and Heat Transfer on Gas Turbine Combustor
… formation of NOx pollutants. LPM technology has advanced to have the ability to produce extremely low level of NOx emissions. The current focus of research on LPM is focused on reducing the NOx emission to much smaller scales, which is mandated because of the stricter regulations and …
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Development of Comprehensive Dynamic Damage Assessment Methodology for High-Bypass Air Breathing Propulsion Subject to Foreign Object Ingestion
… response and dynamic damage progression of an advanced, high-bypass propulsion system in the event of an FOI during operation. Using a finite element framework, a unique modeling methodology has been proposed in order to characterize the FOI response of the system. In order to demonstrate …
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The Effects of Porous Inert Media in a Self-Excited Thermoacoustic Instability: A Study of Heat Release and Reduced Order Modelling
… combustion systems developed at Virginia Tech's Advanced Propulsion and Power Laboratory. To better understand how PIM is affecting the system stability and demonstrate measurements for the improvement of a numerical FTF, experimental work to resolve the spatially varying equivalence ratio …