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 14 of 14 for “"burn time"”.
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Turbulent interactions with normal shocks and their effects on aluminum particle burn time
… shock waves have been proposed to decrease the burn time of fuel particles due to various mechanisms such as enhanced mixing, entropy production, and transport. In order to demonstrate this e ffect, burn time measurements were obtained for laminar and turbulent conditions at similar test …
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Burn time measurements of micron sized Al-Mg alloys and Mg in a heterogeneous shock tube in different oxidizing environments
… yields. Much of the research in present time has been focused on finding an energetic additive that can serve as a trigger in order to unleash its internal energy properly. Magnesium has been a preferential candidate due to its high temperature upon ignition, its porous oxide layer and …
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Analysis of a Hybrid Rocket Burn Using Generalized Compressible Flow
… ports having the same amount of solid fuel and burn time. The results obtained are similar to that of circular port but with a slight decrease in oxidizer to fuel (O/F) ratio and decrease in web thickness. The volumetric efficiencies for different number of square ports are determined assuming a …
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Optimal Sizing and Control of Hybrid Rocket Vehicles
… mass flow rates of the oxidizer as a function of time, for a fixed amount of oxidizer, in order to study the effect of throttling. Two equivalent problems are considered: in the first problem the amount of propellant is fixed, and we are seeking the oxidizer mass flow rate as the function of time …
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Design and Analysis of a Reusable N2O-Cooled Aerospike Nozzle for Labscale Hybrid Rocket Motor Testing
… in the aerospike were predicted for a 10-sec burn time of the hybrid rocket motor.</p> <br /> <p><a href="http://digitalcommons.calpoly.edu/cgi/ir_submit.cgi#_ftnref1">[1]</a> PMMA stands for polymethyl methacrylate, a thermoplastic commonly known by the brand name Plexiglas<sup>®</sup>. …
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Combustion dynamics of metal powders in mixed gas flows
… combustion configurations using pure metals burned in single oxidizers. However, practical configurations take into account different metals, including alloys, that burn in various oxidizing environments and various flow conditions. Validity of the present descriptions for such environments …
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Radial electronic fields for improved tokamak performance
… alter radial particle transport. The plasma burn time until reaching a given ash fraction (the ""timeto-buildup"") is used as a measure of plasma performance. Because the fuel species has a higher cross-field conductivity than the ash, imposition of an inward-directed field enhances fuel …
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Controller Design for a Swirl Injection Hybrid Launch Vehicle
… the launch vehicle within the main engine’s burn time. This constraint allows for these controllers to be implemented on either the first or upper stages of a launch vehicle. This research shows that the linear quadratic regulator, PD-type controller, and adaptive controller all provide …
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Novel Gel-Infused Additively Manufactured Hybrid Rocket Solid Fuels
… as a means of significantly altering the fuel burning rates in a lab scale hybrid rocket motor. Gels based on Jet-A were created using both particulate (fumed silica, micro aluminum, nano aluminum) and polymeric (paraffin wax) gellants. The particle structure of the aluminum powders was …
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Combustion of fine magnesium particles
… screw feeder. Particles were observed to burn in laminar flames as well as in the flames with turbulence induced by a swirling air flow. Particle emission was well detectable above the flame emission background and emission pulses for individual particles were recorded using an array of …
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Metal based reactive nanocomposites prepared by cryomilling
… into an oxygen-acetylene flame to observe their burning characteristics and to measure the combustion temperature. The burn time and temperature as a function of particle size are measured using a single particle combustion measurement. Al-I2 powders are supplied to University of Cincinnati for …
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Study of the heating and ignition of metal powder by electrostatic discharge
… particles vs. dust cloud), ignition delays, burn times, and velocities of ignited and ejected particles were determined from optical measurements. It was determined that the ESD energy is delivered to the powder primarily via its Joule heating. Powder heating in ESD occurs adiabatically. …
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High temperature spectroscopic measurements of aluminum combustion in a heterogeneous shock tube
Aluminum is an important energetic material that burns with a variety of oxidizers with a high reaction enthalpy. It is a top performer for energy density if oxidizer mass is considered as well as the fuel. Because of this, it is often used as an energetic additive in anaerobic conditions because …
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An investigation of the potential and the limitations of small-scale biogas in urban Africa
… of smallscale biogas units. Readings of pH, burn time, pressure, mass and type of feed were captured through the Biogas Monitoring Tool over twelve months. The analysis showed episodes of instability of biogas units linked to changing feeding regimes of simple carbohydrates, organic loading …