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 20 of 755 for “"Ignition"”.
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Novel Ignition Approaches for Improved Hydrogen Ignition
The first study examined H₂ double injection ignition with varying dwell times. Experiments utilized a constant-volume combustion chamber (CVCC) with optical access, replicating compression-ignition engine conditions. Baseline environment: 23.8kg/m³ gas density, 21vol.% O₂, 1000K core temperature. …
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Waiting for Ignition
Waiting for Ignition, a collection of 47 poems, deals with themes of desire, masculinity, family, community, and connection/disconnection. The speaker in these poems navigates the difficulties of identifying as a young gay man in rural Missouri, the loneliness that stems from his disconnect with …
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Characterization of aluminum powder ignition
Heating rate effect and particle size effect on ignition temperature of Al powder were studied to collect data for development of a possible Al powder ignition model. Aluminum ignition is associated with a highly accelerated burn rate and high combustion enthalpy. A new ignition model, which can …
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Ignition mechanism in nanocomposites thermites
… several recent efforts aimed at understanding ignition mechanisms of nanocomposite reactive materials. Although significant progress has been made, ignition mechanisms remain elusive. At the same time, a robust ignition model is required to incorporate these materials in practical energetic …
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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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Modelling of microgravity ignition phenomena
The structure and stability of flame balls and the characteristics of the outwardly propagating spherical flames of sub-limit mixtures are studied both analytically and numerically in the context of an asymptotic analysis in which $\theta\to\infty$, and (1 $-$ Le) = O(1/$\theta$), where $\theta$ is …
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Study of lubrication oil ignition in a rapid compression machine under sporadic pre-ignition conditions
… toward down-sizing and turbo-charging spark ignition (SI) engines in an effort to increase fuel conversion efficiency. However, this has given rise to a destructive phenomenon known as sporadic pre-ignition (SPI). At low cranking speeds and high loads, engines have been observed to knock …
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Ignition limits of explosively dispersed fuel
This thesis aims to explore the ignition limits of explosively dispersed fuel. Significant damage can result from the explosive dispersal and ignition of kerosene in the event of an attack on or an accident in a military facility or vessel carrying kerosene fuel tanks. As such, the work conducted …
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Spray ignition enhancement for multifuel propulsion
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Knock damage in spark-ignition engines
… damage caused by knocking combustion in spark-ignition engines. A literature review indicated that, in general, research into knock has focused on the causes and avoidance of knock, rather than on the damage resulting from knock. The few published works concerning the effects of knock were …
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Ignition study in rapid compression machine
… it is necessary to compile information about the ignition delay, which governs auto-ignition in spark-ignition (SI), compression-ignition (CI) and homogeneous charge compression-ignition (HCCI) engines. In this study, we measured ignition delay on the Rapid Compression Machine (RCM). RCM is a …
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Ignition by Nanosecond Repetitively Pulsed Discharges
… pulsed plasmas can have strong benefits on ignition, including a reduction of ignition delay times, a decrease of minimum ignition energies, or an extension of lean ignition limits. These effects are highly dependent on experimental conditions such as temperature, mixture, pulse repetition …
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Quantification Of Auto-Ignition In Diesel Engines
… previously by researchers to quantify the auto-ignition quality of fuels by calculating global activation energy using Arrhenius plots with data measured for the ignition delay period (ID). Large variation in the activation energy of fuels has been observed even for fuels with closer CN values. …
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Numerical Investigation of Laser-Induced Ignition Phenomena
… thesis investigates various aspects of laser-ignition. Laser ignition is a form of combustion initiation by means of a focused laser pulse in a combustible mixture. The ignition process consists of a chain of processes with varying degrees of importance to the prediction of a successful flame …
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Comprehensive Computational Modeling of Hypergolic Propellant Ignition
<p>Ignition and combustion of hypergolic propellants mono-methyl hydrazine (MMH) and red fuming nitric acid (RFNA) is investigated computationally. A hierarchical approach is chosen to study parametric behavior of isolated processes and complex interactions thereof, in this transient phenomenon. …
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On Determining Spontaneous Ignition in Porous Materials
… lays out the process of analyzing spontaneous ignition likelihood. The Frank-Kamenetskii (F-K) theory forms the basis of the approach. The Damkohler number, defined as the dimensionless heat generation parameter for a self-heating body, is described in terms of two key material constants and …
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Potential Ignition Sources from Residential Electric Cooktops
… 8-inch diameter heating element resulted in the ignition of 47 of 54 tests. The temperature-limiting sensor cooktop did not ignite any of the fuels on any setting. Table 43 quickly illustrates, as logic would, that the potential for ignition is greatest when the cooktop is set to the high …
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Ignition and propagation mechanisms of spray flames
… and intensify the stochastic behaviour of ignition. Still, the presence of small droplets has been found to decrease minimum ignition energies and enhance flame speeds. In this study, a comprehensive analysis of the phases of ignition in sprays is carried out in a controlled, …
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