Optical Investigations of Fuel-Mixture Generation at Cold Start Conditions of SI-Engines in Consideration of Heat Loading

2011 ◽  
Author(s):  
Andreas Bradenstahl ◽  
Andreas Broda ◽  
Peter Eilts
Keyword(s):  
Cold Start ◽  
Fuel Mixture ◽  
Heat Loading ◽  
Si Engines

Investigation of a Novel Fuel Injection Technology Aimed to Reduce Cold-Start Emissions in SI Engines

2002 ◽  
Author(s):  
Brian T. Reese ◽  
Yann G. Guezennec ◽  
Miodrag Oljaca
Keyword(s):  
Fuel Injection ◽  
Cold Start ◽  
Operating Conditions ◽  
The Novel ◽  
Fuel Injector ◽  
Si Engine ◽  
Fuel Droplets ◽  
Si Engines ◽  
Atomization Characteristics ◽  
Injection Technology

A novel fuel atomization device (Nanomiser™) was evaluated under laboratory conditions with respect to its ability to reduce SI engine cold-start hydrocarbon emissions. First, comparisons between the level of atomization using the conventional, pintle-type fuel injector and the novel atomizer were carried out using flow visualization in a spray chamber and particle size distribution. The novel atomizer is capable of producing sub-micron fuel droplets, which form an ultra-fine mist with outstanding non-wetting characteristics. To capitalize on these atomization characteristics, this device was compared to a conventional fuel injector in a small, two-cylinder, SI engine under a number of operating conditions. Results show a slightly enhanced combustion quality and lean limit under warm operating conditions and a dramatic reduction in unburned HC emission under cold operating conditions, with cold emissions with the Nanomiser™ matching those with a conventional injector under fully warm conditions.

Cold-Start Emissions of an SI Engine Using Butanol/Gasoline Blends

2014 ◽  
Vol 977 ◽  
pp. 47-50
Author(s):  
Mei Yu Shi ◽  
Rong Fu Zhu ◽  
Jiang Li ◽  
Yuan Tao Sun
Keyword(s):  
Low Temperature ◽  
Cold Start ◽  
Fuel Mixture ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Experimental Results ◽  
Si Engine

The influence of butanol/gasoline blends at low temperature for-7°C, on cold-start emissions of a spark-ignition engine was tested. In cold-start period of the engine, the efficiency of the engine was expected to be poor, and the air/fuel mixture would be leaner for the more butanol added. The experimental results showed that the engine could be stable with B10 and B30 in cold-start, and HC and CO emissions reduced more significantly with more butanol added.

scholarly journals Effect of Sisal Nanoparticles on Single Cylinder Spark Ignition Engine Combustion

2020 ◽  
Vol 8 (6) ◽  
pp. 1027-1032
Keyword(s):  
Flame Propagation ◽  
Combustion Process ◽  
Fuel Mixture ◽  
Spark Ignition ◽  
Combustion Efficiency ◽  
Spark Ignition Engine ◽  
Single Cylinder ◽  
Engine Combustion ◽  
Si Engines ◽  
Propagation Velocities

Turbulence is an important parameter to be considered for effective combustion inside a cylinder. Heat transfer inside the cylinder affects the combustion process. Insufficient turbulence leads to incomplete combustion, resulting in pollution. Effective flame propagation leads to higher combustion rates in SI engines which in turn requires enough turbulence. Effective combustion efficiency can be achieved through higher flame propagation velocities. In the present work an attempt has been made to enhance the turbulence inside the cylinder of a single cylinder spark ignition engine by injecting solid nanoparticles into the air fuel mixture.

scholarly journals NUMERICAL INVESTIGATION ON THE EFFECTS OF GASOLINE AND HYDROGEN BLENDS ON SI ENGINE COMBUSTION

2014 ◽  
Vol 46 (1) ◽  
pp. 66-77
Author(s):  
Saugirdas Pukalskas ◽  
Alfredas Rimkus ◽  
Mindaugas Melaika ◽  
Zenonas Bogdanovičius ◽  
Jonas Matijošius
Keyword(s):  
Fuel Mixture ◽  
Simulation Software ◽  
Si Engine ◽  
Exhaust Gases ◽  
Software Analysis ◽  
Engine Efficiency ◽  
Engine Combustion ◽  
Si Engines ◽  
Analysis Of Results ◽  
Hc Emissions

Even small amount additive (10…15% by volume from whole air amount) of hydrogen (H2) into spark ignition (SI) engines obviously effects ecological parameters and engine efficiency because of H2 exclusive properties. SI engine work process simulation was made using AVL Boost simulation software. Analysis of results showed that engine power depends a lot on H2 supply technique into engine; NOx amount in exhaust gases directly proportional to the amount of H2, however, making mixture leaner up to λ = 1.6, it is possible to reach significant NOx decrease. Increased amount of H2 as an additive in fuel, changes H/C ratio in fuel mixture, also hydrogen improves properties of the mixture (particularly lean) and combustion of hydrocarbons what can be a reason of decreased HC emissions in exhaust gases. Keyword(s): Hydrogen and gasoline mixture, engine efficiency, exhaust gases, nitrous oxides, hydrocarbons, simulation.

Condensation of Fuel on Combustion Chamber Surfaces as a Mechanism for Increased HC Emissions from SI Engines During Cold Start

1997 ◽  
Author(s):  
Rudolf H. Stanglmaier ◽  
Charles E. Roberts ◽  
Ofodike A. Ezekoye ◽  
Ronald D. Matthews
Keyword(s):  
Combustion Chamber ◽  
Cold Start ◽  
Si Engines ◽  
Hc Emissions

In-Cylinder Measurements and Analysis on Fundamental Cold Start and Warm-up Phenomena of SI Engines

1995 ◽  
Author(s):  
Gerd Grüefeld ◽  
Michael Knapp ◽  
Volker Beushausen ◽  
Peter Andresen ◽  
Werner Hentschel ◽  
...  
Keyword(s):  
Cold Start ◽  
Warm Up ◽  
Si Engines

Properties of an Ethanol−Diethyl Ether−Water Fuel Mixture for Cold-Start Assistance of an Ethanol-Fueled Vehicle

1998 ◽  
Vol 37 (8) ◽  
pp. 3366-3374 ◽  
Author(s):  
Tomoko Kito-Borsa ◽  
Debra A. Pacas ◽  
Sami Selim ◽  
Scott W. Cowley
Keyword(s):  
Diethyl Ether ◽  
Cold Start ◽  
Fuel Mixture

Numerical Study to Achieve Stratified EGR in Engines

2002 ◽  
Author(s):  
Bassem H. Ramadan ◽  
Charles L. Gray ◽  
Harold J. Schock ◽  
Fakhri J. Hamady ◽  
Karl H. Hellman
Keyword(s):  
Numerical Study ◽  
Direct Injection ◽  
Fuel Mixture ◽  
Combustion Engines ◽  
Lean Burn ◽  
Complete Combustion ◽  
Stratified Charge ◽  
Automotive Emissions ◽  
Si Engines ◽  
Inlet Manifold

Exhaust Gas Re-circulation (EGR) has been used in intemal combustion engines to control automotive emissions. EGR is usually used to dilute the inlet charge, which consists of air, by redirecting part of the exhaust into the inlet manifold of the engine. This results in a reduction of the oxygen mass fraction in the inlet charge. However, dilution of the air-fuel mixture in an engine using stratified EGR could offer significant fuel economy saving comparable to lean burn or stratified charge direct-injection SI engines. The most critical challenge is to keep the EGR and air-fuel mixture separated, or to minimize the mixing between the two zones to an acceptable level for stable and complete combustion. Swirl-type stratified EGR and fuel-air flow structure is considered desirable for this purpose, because the circular shape of the cylinder tends to preserve the swirl motion. Moreover, the axial piston motion has minimal effect on the swirling motion of the fluid in the cylinder. In this study, we consider intake system design in order to generate a two-zone combustion system, where EGR is maintained in a layer on the periphery of the cylinder, and the fuel-air mixture is maintained in the center of the cylinder. KIVA-3V was used to perform numerical simulations on different EGR systems. The simulations were performed to determine if the two-zones can be generated in the cylinder, and to what extent mixing between the two zones occurs. For the engine geometries considered in this study, the results showed that it is possible to generate the two zones, but mixing is difficult to control.

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