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.
Results
Showing 1 to 20 of 37 for “"Engine combustion"”.
-
Effects of Turbulence on Spark-Ignition Engine Combustion
Made available in DSpace on 2014-12-13T19:55:20Z (GMT). No. of bitstreams: 1 7524348.pdf: 10540246 bytes, checksum: dddd6e4708126a30fb8de703e90a1389 (MD5) Previous issue date: 1975
-
Modeling of injection-rate shaping in diesel engine combustion
In direct-injection diesel engines, control of fuel-air mixing is essential for the combustion and the reduction of hazardous emissions. Fuel injection-rate shaping is one of the measures used to control fuel-air mixing in the combustion chamber, which results in a specific temporal distribution of …
-
A computational and experimental study of spark ignition engine combustion
This work focuses on aspects of combustion in a spark ignition engine. A pent-roof research engine was used to generate an experimental data set which was combined with a preexisting data set from a disc-chamber research engine. The combined dataset was used to refine a thermodynamic spark ignition …
-
Multi-Physics Co-Simulation of Engine Combustion and Exhaust Aftertreatment system: Development of a Multi-Physics Co-Simulation Framework of Engine Combustion and Exhaust Aftertreatment for Model-Based System Optimisation
… of detailed chemistry models in internal combustion engine simulations is becoming mandatory as new combustion strategies and lower global emissions limits are setting the path towards a more efficient engine cycle simulation tool. In this report, the computational capability of the …
-
Multi-Physics Co-Simulation of Engine Combustion and Exhaust Aftertreatment system: Development of a Multi-Physics Co-Simulation Framework of Engine Combustion and Exhaust Aftertreatment for Model-Based System Optimisation
… of detailed chemistry models in internal combustion engine simulations is becoming mandatory as new combustion strategies and lower global emissions limits are setting the path towards a more efficient engine cycle simulation tool. In this report, the computational capability of the …
-
Numerical analysis of high pressure injection of natural gas into diesel engine combustion chambers
… natural gas as it is injected into a simulated combustion chamber of a diesel engine was investigated using numerical techniques. The TEACH code developed by A.D. Gosman of Imperial College, London, was used to investigate the influence of parameters such as injection angle, engine speed, and …
-
The effect of combustion chamber geometry on S.I. engine combustion rates : a modeling study
… Institute of Technology, Dept. of Mechanical Engineering, 1982.
-
Impact of retarded spark timing on engine combustion, hydrocarbon emissions, and fast catalyst light-off
… the effects of substantial spark retard on engine combustion, hydrocarbon (HC) emissions, feed gas enthalpy, and catalyst light-off. Engine experiments were conducted at cold engine conditions for various ignition timings and air/ fuel ratios. Chemical and thermal energy of the exhaust gas …
-
More effective use of fuel octane in a turbocharged gasoline engine : combustion, knock, vehicle impacts
… ratio, and downsizing a spark-ignition engine are well known strategies for improving vehicle fuel economy. However, such strategies result in higher in-cylinder pressures and temperatures which increase the likelihood of engine knock above that of naturally-aspirated engines. A high …
-
Methodology For Validating Multi-Dimensional Engine Combustion Models And Fuel Surrogates Using An Optically Accessible Compression Ignition Engine
<p>In response to increasingly stringent engine emissions regulation, three dimensional in-cylinder combustion modeling is increasingly being used as a tool to optimize the combustion process and reduce the cost of experimental testing. Due to the complexity of the physical and chemical …
-
Experimental Studies of Injector Array Configurations for Circular Scramjet Combustors
… representative of state of the art scramjet engine combustion chambers were experimentally studied in a cold-flow (non-combusting) environment to determine their fuel-air mixing behavior under different operating conditions. The experiments were run at nominal freestream Mach numbers of 2 and …
-
CFD Study of Taylor-Like Vortices in Swirling Flows
… natural phenomena and man-made devices. Numerous engineering applications such as turbomachinery, jet engine combustion chambers, mixing tanks and industrial burners involve swirling flows. This wide range of applications is due to unique characteristics offered by swirling flows such as increase …
-
System Identification and State Estimation for Intake Manifold Charge Flow Temperature of a Compression Ignition Diesel Engine
… temperature is a factor used in mean value engine models (MVEMs) for the calculation of intake mass air charge and oxygen flow. More stringent emission requirements have led to increased deployment of more advanced engine combustion models onto production engine controllers. Measurement of …
-
Feasibility studies of the exhaust-gas reforming of hydrocarbon and alcohol fuels
… to hydrocarbon and alcohol spark-ignition engine fuels, has been studied. In the first instance, a theoretical approach is reported. Complex chemical equilibria and energy balance software has been developed, and used to simulate exhaust-gas reforming reactions for n-heptane and methanol …
-
Reducing emissions of a large bore two stroke cycle engine using a natural gas and hydrogen mixture
… formation is primarily a function of in-cylinder combustion temperatures. A challenge for engine researchers is to identify methods to lower combustion temperatures while maintaining complete combustion. Blending hydrogen into an engine's fuel can lower in-cylinder combustion temperatures and …
-
Modeling and Simulation of High-Density Spray Combustion
… and low-emissions can be realized in combustion engines that operate at high-pressures and low-temperatures conditions (high densities). The design of such engines relies on accurate models of the physical processes involved. Three areas of concern are multi-phase phenomena, the …
-
Two contrasting approaches to auto-ignition modelling for HCCI engines
… 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 implementation. This model was then combined with an …
-
High compression ratio turbo gasoline engine operation using alcohol enhancement
… blends were explored as a strategy to mitigate engine knock, a phenomena in spark ignition engine combustion when a portion of the end gas is compressed to the point of spontaneous auto-ignition. This auto-ignition is dangerous to the operation of an internal combustion engine, as it can …
-
Large Eddy Simulation of Boundary Layer Combustion
… modeling challenges it presents. Near wall combustion phenomena is relevant in a variety of combusting environments including but not limited to the occurrence of fire spread, as a result of a heating load to a flammable wall leading to fire growth in enclosure settings; and in engine …
Page 1 of 2