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 53 for “"autoignition"”.
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Autoignition in turbulent two-phase flows
… of the dissertation presents a DNS study on the autoignition of n-heptane sprays at high pressure / low temperature conditions. The analysis revealed that spray ignition occurs first in well-mixed locations with a specific value of the mixture fraction. Changes in the operating conditions …
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A numerical simulation of diesel autoignition
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
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Developing fundamentally based models for autoignition
There is renewed interest in autoignition, especially due to the recent development of the homogenous charge compression ignition (HCCI) engine, highly promising with its low Nox and particulate emissions and high efficiency. However it is difficult to control HCCI autoignition. In general accurate …
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High load limits of the controlled autoignition engine
The controlled autoignition (CAI) engine is an engine concept that features very low soot and NOx emissions while achieving diesel-like efficiency. The CAI combustion process is characterized by a fast, volumetric burn of a premixed fuel and air mixture that is heavily diluted with either excess …
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Autoignition study of next generation aviation fuels and components
… their ignition delay times at various autoignition conditions. Complex multistage ignition behavior of fuels at specific conditions are further evaluated with rapid compression machine (RCM) experimental results and CHEMKIN chemical mechanism simulations. A newly constructed shock tube …
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Autoignition measurements and modeling in a rapid compression machine
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Autoignition and combustion chemistry of kerosene type fuels and components
… to the research community. The pure components autoignition properties were compared to current kinetic models available for the species themselves or ones of similar bonding; to provide insight into the accuracy of the models at low temperature conditions. Overall the models did a good job of …
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Autoignition measurements for oxygenated fuels in a rapid compression machine
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1993.
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Surrogate modeling of alternative jet fuels for study of autoignition characteristics
… evaluated for their predictive capabilities of autoignition characteristics for alternative jet fuels. Computational simulation results are compared with published data from experimental rapid compression machine (RCM) tests for conventional jet fuel. Evaluation of these surrogate models aids in …
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Insights relating to octane rating and the underlying role of autoignition
… shown by the author that the manifestation of autoignition in the CFR engine that is used for octane rating differs significantly from that which is typically experienced in a modern production engine under knocking conditions (SAE paper 2005-01-2081). The present research examines the knock …
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Design, build and commission a shock tube apparatus for autoignition research
Includes abstract. Includes bibliographical references (p. 65-67).
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Shockless explosion combustion - Controlled autoignition in stratified mixtures for pressure gain combustion
… the reliable generation of a homogeneous autoignition in a reactive mixture flow as a pressure gain combustion approach. Pressure gain combustion represents a promising concept to achieve an increase in the thermal efficiency of gas turbine applications compared to conventional constant …
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Autoignition and emission characteristics of gaseous fuel direct-injection compression-ignition combustion
… research. To improve understanding of the autoignition and emission characteristics of natural gas direct-injection compression-ignition combustion, the effects of key operating parameters (including injection pressure, injection duration, and pre-combustion temperature) and gaseous fuel …
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Investigating the feasibility of characterising gasoline autoignition using a motored engine apparatus
… is through chemical kinetic modelling of the autoignition properties of constituent compounds. The results obtained from models, however, are dependent on experimental data for validation. It was the intention of this thesis to provide empirical data that could be used confirm a recently …
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The autoignition characteristics of turbocharged spark ignition engines with exhaust gas recirculation
… the modeling of one of these phenomena - the autoignition of an unburned portion of the air-fuel mixture - and a potential strategy intended to delay the occurrence of this frequently damaging type of combustion reaction. The autoignition abatement approach studied entails the recirculation of …
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A multi-zone model of the CFR engine : investigating cascading autoignition and octane rating
… It has been previously proposed that a cascading autoignition", resulting from an in-cylinder temperature gradient, is responsible for this unique pressure development.
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The development of an enhanced autoignition sub-model for use in CFD combustion simulations
With the ever increasing pressure to manufacture more efficient engines that produce lowerexhaust emissions, there is a corresponding need for a greater understanding of the combustion processes within these engines. Specifically, it is the interaction between the fuel and the engine that …
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Effect Of Cetane Number And Volatility On Autoignition And Combustion Of Alternative Fuels And Their Surrogates
… the effect of these fuel properties on autoignition, combustion, performance, and emissions under compression ignition conditions to evaluate the operational capability of diesel engines fueled with alternative fuels.</p> <p>This dissertation covers a detailed investigation of the …
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C.A.R.S. temperature measurements and chemical kinetic modelling of autoignition in a methanol-fuelled internal combustion engine
… data for chemical kinetic modelling of end-gas autoignition. Five published mechanisms (Grotheer et al 1992, Grotheer and Kelm 1989, Norton and Dryer 1989, Dove and Warnatz 1983, .and Esser and Warnatz 1987) are used in the autoignition study, and the results for the different mechanisms are …
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Characterisation of the autoignition delay behaviour of n-heptane in the IQT combustion bomb using CFD modelling
… of temperatures and pressures, the measured autoignition delay did not correlate with the chemical autoignition delay associated with a stoichiometric, homogenous mixture as predicted by detailed chemical kinetic models. ... This project involved an investigation to study and reconcile this …
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