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 “"ignition time"”.
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Ignition and combustion behaviors of nano-composite energetic materials
… behavior of thermites. In this study, the ignition sensitivity of an aluminum molybdenum-trioxide (AI/M0O3) composite mixture was examined. Laser ignition experiments were performed to determine the ignition time and burn rates of newly developed nano-Al mixed with M0O3. The scope of this …
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Exergy Based SI Engine Model Optimisation. Exergy Based Simulation and Modelling of Bi-fuel SI Engine for Optimisation of Equivalence Ratio and Ignition Time Using Artificial Neural Network (ANN) Emulation and Particle Swarm Optimisation (PSO).
… and evaluated. A four-stroke bi-fuel spark ignition (SI) engine is modelled for optimisation of engine performance based upon exergy analysis. An artificial neural network (ANN) is used as an emulator to speed up the optimisation processes. Constrained particle swarm optimisation (CPSO) is …
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Low flux radiative ignition studies of ammonium perchlorate composite propellants
The vast majority of propellant ignition data has been collected and studied for heat fluxes in the typical, intentional ignition range. However, when a propellant contained within a rocket motor case is exposed to low fluxes in hazardous situations, such as close proximity to a fire, unwanted …
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Laser shadowgraph study of early flame propagation in swirling flows near the lean misfire limit.
… ({1\over A}{dA\over dt})$ at 0.5 ms from ignition time for the 2-D and the spherical models at ${r\over R}=0.68$ was within the range 0.63-0.97 and at ${r\over R}=0.55$ was within the range 0.5-0.59. The stretch factor for the ellipsoidal model at ${r\over R}=0.68$ was within the range …
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Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics
This thesis reports a model to predict the auto-ignition time of single droplets of n-paraffin fuel mixtures using the method of continuous thermodynamics. The model uses experimental data for pure fuels to fit rate parameters for a single-step global chemical reaction equation; from this, …
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Dynamic mesh adaption for supersonic combustion waves modeled with detailed reaction mechanisms
… as implicit upwind finite volume scheme, <br>time scale splitting, adaptive local time stepping, and source term <br>integration methods, to solve stiff systems of ODEs. <br>Thus we obtain the possibility to simulate on a workstation with <br>moderate numerical cost demanding, time-dependent …
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Driver-gas Tailoring For Test-time Extension Using Unconventional Driver Mixtures
… great importance to increase experimental test times, and this can be done by tailoring the interface between the driver and driven gases. Using unconventional driver-gas tailoring with the assistance of tailoring curves, shock-tube test times were increased from 1 to 15 ms for reflected-shock …
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Optimizing terminal conditions using geometric guidance for low-control authority munitions
… up table which is easily implemented in real time with minimal additional memory requirements. The thesis further shows that performance improvements are gained by altering the rocket ignition time in flight, by tightening the tolerances on some key sources of modeling error, and by developing …
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Radiant Auto-Ignition of Wood
Although piloted-ignition is well studied, auto-ignition is not, and under some conditions the latter may initiate the former. For that reason, the dynamics and mechanisms in the auto-ignition of redwood by radiant heating were experimentally studied. An open-cone radiant source heated an insulated …
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Effects of Moisture on Combustion Characteristics of Live California Chaparral and Utah Foliage
… investigates the quantitative and qualitative ignition characteristics of eight live fuels, four from southern California (manzanita, scrub oak, ceanothus, and chamise) and four from Utah (canyon maple, gambel oak, big sagebrush, and Utah juniper). Individual leaves were observed as they were …
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Ignition Quality Tester: an alternative for characterizing the combustion kinetics of low volatility fuels, The
… of this thesis is to demonstrate that the Ignition Quality Tester (IQT) can be used to validate the kinetic mechanisms of both high and low volatility fuels. Such validated mechanisms are an essential component for engine models used to improve efficiency and determine the impact of …
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Modifying burning rate and agglomeration size in aluminized composite solid propellants using mechanically activated metals
… has been applied to tailor aluminum particle ignition and combustion. In this research, mechanical activated aluminum magnesium powders are synthesized, tested in both laser ignition using CO2 and propellant. Prepared powders categorized into particle size that suitable for propellant …
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Factors Affecting Fuel Transport of Firefighting Foam
… performance of single surfactants through ignition test. The thermodynamics of the interaction between fuel and single surfactants helped us to understand the fuel transport mechanism and role of micelle on fuel transport. Surfactant and fuel interaction has been studied below, at, and …