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Showing 1 to 17 of 17 for “"mixture preparation"”.
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Mixture preparation, combustion, and HC emissions at different cranking speeds
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Modeling of droplet evaporation, flash-boiling, and mixture preparation in internal combustion engines
… numerical models essential to the simulation of mixture preparation, a vital process that determines the combustion outcome. Combustion models are also developed for compression-ignition and spark-ignition engines, and are used to simulate the advanced engine operation concepts. In this study, a …
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Mixture preparation behavior in port fuel injected spark ignition engines during transient operation
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Fuel targeting and thermal environment effects onf spark-ignition engine mixture preparation process
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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A visualization study of mixture preparation mechanisms for port fuel injected spark ignition engines
… was carried out that examined qualitatively the mixture preparation process in port fuel injected spark ignition engines. The primary variables in this study were intake valve lift, intake valve timing, injector spray quality, and injection timing. A special visualization engine was used to …
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Liquid fuel behavior in the mixture preparation process during starting and warm-up in a spark ignition engine
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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CFD Modelling of the Mixture Preparation in a Modern Gasoline Direct Injection Engine and Correlations with Experimental PN Emissions
… to reveal the connections between pre-combustion mixture indicators and PN emissions. Firstly, a novel calibration methodology is introduced to accurately predict the widely used characteristics of the high-pressure fuel spray. The methodology utilised the Siemens STAR-CD 3D CFD software …
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Reducing cold start hydrocarbon emissions from port fuel injected spark ignition engines with improved management of hardware & controls
… effect of variable valve timing on first cycle mixture preparation, the interaction between fuel injection and valve events, and the development of a flow reactor exhaust manifold for fast catalyst light-off. For the first cycle of cranking, delaying the intake valve opening (IVO) creates a …
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Combustion optimization in a hydrogen-enhanced lean burn SI engine
… offset by the reduced combustion speed of lean mixtures, which can lead to high cycle-to-cycle variation and unacceptable engine behavior characteristics. Hydrogen-enhancement can suppress the undesirable consequences of lean operation by accelerating the combustion process, thereby extending …
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ΣΥΣΧΕΤΙΣΗ ΠΑΡΑΜΕΤΡΩΝ ΛΕΙΤΟΥΡΓΙΑΣ ΚΙΝΗΤΗΡΩΝ ΑΥΤΟΚΙΝΗΤΩΝ ΠΡΟΣ ΤΗΝ ΠΟΙΟΤΗΤΑ ΤΟΥ ΚΑΥΣΑΕΡΙΟΥ
THE OPERATING CONDITION OF THE MIXTURE PREPARATION SYSTEM AND THE IGNITION SYSTEM OF A RANDOM SAMPLE OF FOUR HUNDRED IN USE VEHICLES IN ATHENS IS STUDIED. THIS ANALYSIS CAN BE USED TO INVESTIGATE THE INFLUENCE OF EACH PARAMETER AFFECTINGTHE ABOVE MENTIONED SYSTEMS ON EXHAUST EMISSION AND TO DEVELOP …
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Effects of charge motion control during cold start of SI engines
… the effectiveness of enhanced charge motion on mixture preparation, combustion, and hydrocarbon (HC) emissions. Different charge motions were produced by three different shapes of charge motion control valves (CMCV), which block off 75% of the engine's intake ports. Cold-fluid steady state …
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Cold start fuel management of port-fuel-injected internal combustion engines
… that are chosen to illustrate cycle-to-cycle mixture preparation dependence on second cycle fueling. Significant cycle-to-cycle dependence is observed with the change in second cycle. A fueling deficit in cycle two has a more pronounce effect on future cycles delivered charge mass than a …
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Combustion Visualization And Particulate Matter Emission Of A Gdi Engine By Using Gasoline And E85
… heavily investigated, such as air-fuel mixing preparation, fuel wall-wetting, higher HC and PM emissions, catalytic convertor efficiency, knocking, and pre-ignition. Besides, advanced technologies represent higher production cost.</p> <p>Because of the limited resource of petroleum-based fuels, …
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Accelerated Sepsis Diagnosis by Seamless Integration of Nucleic Acid Purification and Detection
… DM can be used to automatically prepare the PCR mixture. This begins with compartmenting the eluent in accordance with the desired number of multiplex qPCR reactions, and then transporting droplets of the PCR reagents to mix with the eluent droplets. Under the outlined approach, the IPF - DM …
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CFD Modelling of Down-Sized GDI Engines: Fuel Injection, In-Cylinder Phenomena and Correlation to Engine-Out PN Emissions
… liquid film formation and, in turn, of gas-phase mixture quality. These inputs were defined based on speed-load correlations derived from piston, liner and cylinder head telemetry data. The process of liquid spray-to-wall impact, subsequent liquid film deposition and film-to-flow evaporation were …
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Traversing hot jet ignition delay of hydrocarbon blends in a constant volume combustor
… combustor. The issued jet ignites the fuel-air mixture in the combustion chamber. Fuel-air mixtures are prepared with different hydrocarbon fuels of different reactivity, namely, methane, propane, methane-hydrogen blend, methane-propane blend and methane-argon blend. The jet acts as a rapid, …
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Möglichkeiten und Grenzen der Teillaststeuerung von Ottomotoren mit vollvariablem Ventilhub
Im Rahmen dieser Arbeit werden die Potenziale zur Steigerung des Gesamtwirkungsgrads von stöchiometrisch homogen betriebenen Ottomotoren in der Teillast untersucht. Im Gegensatz zur konventionellen Laststeuerung über die Drosselklappe bezeichnet die betrachtete, drosselfreie Laststeuerung die …