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 23 for “"Ignition temperature"”.
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Novel Relative Spontaneous Ignition Temperature Determination Using Carbon Dioxide Onset with STA/IR
… in the determination of relative spontaneous ignition temperature, or RSIT. The RSIT value during the growing season for Chinese tallow, Chinese tallow stem, Chinese privet, and Yaupon were 208.4°C, 250.3°C, 210.1°C, and 232.3°C respectively. During the dormant seasons, the values for Chinese …
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The use of chemiluminescence for detection of ignition, temperature, and fuel-to-air ratio of flames
A fast response method for detection of ignition and extinction of liquid spray flames has been improved. Also, a method of determining fuel-to-air ratios and temperatures of pre-mixed, gaseous flames has been developed. Both methods utilize chemiluminescent signals from an OH system centered at …
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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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Quantitative assessment of the frictional ignition resistance of metals in high-pressure oxygen
… for selecting alloys resistant to frictional ignition in high-pressure oxygen environments. A previous ignition-resistance metric proposed by NASA WSTF varies strongly and unpredictably with test conditions, thus limiting its usefulness. The material index developed here incorporates key …
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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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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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The Effect of Orientation on the Ignition of Solids
<p>The ignition of a solid is an inherently complex phenomenon influenced by heat and mass transport mechanisms that are, even to this day, not understood in entirety. In order to use ignition data in meaningful engineering application, significant simplifications have been made to the theory of …
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The Kinetics of Ni/Al Reactive Intermetallic Composites
… thesis, the effects of this laminate period, ignition temperature and volumetric defects are studied. The presence of defects not only speeds up the reaction by as much as 5 times, but changes the nature of mass transport from diffusive to partly ballistic. Subsequently, the feasibility of …
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Knock mitigation on boosted Controlled Auto-Ignition engines with fuel stratification and Exhaust Gas Recycling
… for knock mitigation on boosted Controlled Auto-Ignition (CAl) engines. Experiments were first conducted on Rapid Compression Machine (RCM) to profile the ignition characteristic of the specific fuel used, and to explain the dilution effects of air and inert gas. Then the effect of fuel …
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Aplicação de métodos experimentais alternativos para avaliação da retardância à chama em madeiras
… flammability index (GWFI) and the glow-wire ignition temperature (GWIT) tests, following the procedures recommended in IEC 60695-2-10, IEC 60695-2 -12 and IEC 60695-2-13, and the mass loss cone calorimeter (MLCC) test, in accordance with ASTM E2102-08. The results demonstrated that the …
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Heat transfer model for the ignition of metal powder on a heated filament
The thermal processes leading to ignition of metal powders in environments that experience rapid temperature changes are currently poorly understood. In this research, a methodology for studying and quantification of such processes is developed. In the experimental case study, the ignition …
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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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SEASONAL FLAMMABILITY COMPARISONS OF NATIVE AND EXOTIC PLANTS IN THE POST OAK SAVANNAH, BLACKLAND PRAIRIE, AND PINEYWOODS ECOREGIONS OF TEXAS
… relative spontaneous ignition temperature (RSIT; °C), gas-phase maximum mass loss rate (GP-MMLR; % min<sup>-1</sup>), and gas-phase combustion duration (GP-CD; min.). Greater mean VM% was a general indicator of greater mean NHC-AF(s) and GP-MMLR(s). All foliar …
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High energy density entrainment-based catalytic micro-combustor for portable devices in extreme environmental conditions
… (2-3 mins). Furthermore, we demonstrated low ignition temperature (108-125°C), which facilitates low energy consumption (~1948 J). In addition, an optimal fuel flow rate (3.09×10⁻⁸ m³/s) was determined via FEM simulations and experiments to enable fuel savings (high fuel conversion) while …
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Effect of polymorphic phase transformations within an alumina layer on the ignition of aluminum particles
Experimental measurements of aluminum ignition temperature and models used to describe aluminum ignition are reviewed. It is shown that the current models cannot describe ignition of aluminum powders of different sizes and ignited under various experimental conditions. The properties of and phase …
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The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines
… and diluted fuel charge gives lower cylinder temperatures than conventional diesel compression ignition and spark ignited gasoline combustion, resulting in low engine out emissions of both nitrogen oxides and soot. To be able to optimize and use the advanced combustion concepts in commercial …
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Numerical simulation of combustion and unburnt products in dual-fuel compression-ignition engines with multiple injection
… operating costs would be lower. With a high ignition temperature and relatively low reactivity, natural gas can enable promising approaches to combustion engine design. In particular, the combination of low reactivity natural gas and high reactivity diesel may allow for optimal operation as a …
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Effects of Moisture on Combustion of Live Wildland Forest Fuels
… west, and the southeastern regions. Temperature, mass, and video images were recorded throughout each experimental run from which numerous data values were obtained such as time to ignition, ignition temperature, flame height, time of flame duration, and mass release rates. …
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Modeling the evolution of composition of the fuel and lubricant mixture on the cylinder wall in internal combustion engines
… The released oil droplets lower the self-ignition temperature of the fuel vapor which might lead to pre-ignition. Pre-ignition is a phenomenon in which the fuel vapor ignites before the spark plug fires causing huge pressure rise which can be detrimental for the engine. The fuel spray on …
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