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 38 for “"Auto-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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Quantification Of Auto-Ignition In Diesel Engines
… made 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 …
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Predictive chemical kinetics for auto ignition of fuel blends
… mechanisms increasingly require the use of automated mechanism generators, such as the Reaction Mechanism Generator (RMG). Use of these automated generators for creating quality chemical mechanisms necessitates accurate reaction rates. Unfortunately, the vast majority of kinetic parameters …
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Two contrasting approaches to auto-ignition modelling for HCCI engines
… the broad contrasting of two hydrocarbon fuel auto-ignition models formulated for the emulation of combustion dynamics in Homogeneous Charge Compression Ignition (HCCI) engines. The first (empirical) auto-ignition model was adapted from its previously published form, for HCCI engine model …
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Calibration and implementation of a functional global auto-ignition model
… based on a functional global reaction-rate-based auto-ignition model (FGAM) developed at the Sasol Advanced Fuels Laboratory (SAFL). During the development of the model, its performance had been validated against a detailed kinetic auto-ignition mechanism in regions of lean to stoichiometric …
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Closed-loop, variable-valve-timing control of a controlled-auto-ignition engine
… a closed-loop controller for use on a Controlled-Auto- Ignition (CAI) / Spark-Ignition (SI) mixed mode engine equipped with a variable-valve-timing (VVT) mechanism. The controller in this study was designed only for use in the CAI regime. Operation in the SI regime and control of transitions …
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The HCCI Fuel Number - Measuring and Describing Auto-ignition for HCCI Combustion Engines
… 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 engines, knowledge of fuel behavior is needed, and …
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The auto-ignition characteristics of ammonia turbulent flames in a high temperature co-flow
L'abstract è presente nell'allegato / the abstract is in the attachment
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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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Knock mitigation on boosted Controlled Auto-Ignition engines with fuel stratification and Exhaust Gas Recycling
… (EGR) 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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The role of fuel in determining the high load limit of controlled auto-ignition engines
Controlled Auto-Ignition (CAI) engines have the potential to increase fuel economy while lowering nitrogen oxide and soot emissions. One hurdle that is currently being faced is the engine's inability to operate at high loads due to a large Maximum Pressure Rise Rate (MPRR). To address this issue, …
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An Experimental Study of Two-Stroke Cyclic Variation and a Prototype Component Design for Controlled Auto Ignition.
Given the current concern of global warming the automotive industry is under pressure to provide alternative powertrains to improve fuel efficiency and reduce the production of carbon dioxide and associated emissions. 2-stroke engines are known to provide considerable benefits in weight reduction …
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On fuel selection in controlled auto-ignition engines : the link between intake conditions, chemical kinetics, and stratification
… the high-load limit in a stratified Compression Auto-Ignition (CAI) engine. This was accomplished by first studying the validity of the current metrics that predict when the high-load limit is reached. Temperature and fuel concentration stratification, and the degree that they can be used to …
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Effect Of Intake Temperature And Boost Pressure On The Auto-Ignition Of Fuels With Different Cetane Numbers And Volatilities
… air inlet temperature and boost pressure on the auto-ignition of fuels that have different CNs and volatilities in a single cylinder diesel engine. The inlet air temperature is varied over a range of 30°C to 110°C at a constant intake pressure of 1.1 bar. The boost pressure is varied from 1.1 bar …
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Production of ceramic powders using auto-ignition combustion synthesis (AICS) for use in actinide bearing nitride ceramic nuclear fuels
Includes bibliographical references (pages 74-79).
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Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system
Gasoline Homogeneous Charge Compression Ignition (HCCI) engine has the potential of providing better fuel economy and emissions characteristics than current spark ignition engines. One implementation of this technology employs a Variable Valve Timing (VVT) system and is also often referred to as …
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Knock limits in spark ignited direct injected engines using gasoline/ethanol blends
… also display superior chemical resistance to auto-ignition, therefore allowing the further extension of knock limits. An engine with both DI and port fuel injection (PFI) was used to obtain knock onset limits for five gasoline/ethanol blends and different intake air temperatures. Using PFI as …
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Flame propagation model for the CFR engine under knocking and non-knocking conditions
… of the factors that limit the design of spark-ignition (SI) engines. It is caused by the auto-ignition of the end-gas during combustion and can lead to severe engine damage and failure. Octane number indicates the ability of a fuel to resist auto-ignition in a SI engine and forms part of the …
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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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