713 Effects of Fuel Concentration Distribution under a Throttle Opening in the Combustion Chamber of a Natural Gas Fueled Spark Ignition Engine

2000 ◽  
Vol 2000.75 (0) ◽  
pp. _7-25_-_7-26_
Author(s):  
Kazuhide IWASA ◽  
Daisuke SEGAWA ◽  
Hiroshi ENOMOTO ◽  
Toshikazu KADOTA ◽  
Yukiyoshi FUKANO
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Concentration Distribution ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Fuel Concentration ◽  
Gas Fueled

scholarly journals Effect of the Factors of Combustion Chamber on the Performance and Exhaust Emissions in a Natural Gas Fueled Spark Ignition Engine.

1998 ◽  
Vol 64 (621) ◽  
pp. 1574-1580
Author(s):  
Katsumi KATAOKA ◽  
Yoshitaka ATSUMI ◽  
Daisuke SEGAWA ◽  
Toshikazu KADOTA ◽  
Yukiyoshi FUKANO
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Exhaust Emissions ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Gas Fueled

Scavenged Pre-Chamber on a Gas Engine for Light Duty Truck

2016 ◽  
Author(s):  
Jiří Vávra ◽  
Zbyněk Syrovátka ◽  
Michal Takáts ◽  
Eduardo Barrientos
Keyword(s):  
Natural Gas ◽  
Thermal Loading ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Validation Data ◽  
Automotive Engine ◽  
Light Duty ◽  
Full Load Operation ◽  
Gas Fueled ◽  
Light Duty Truck

This work presents an experimental investigation of advanced combustion of extremely lean natural gas / air mixture in a gas fueled automotive engine with a scavenged pre-chamber. The pre-chamber, which was designed and manufactured in-house, is scavenged with natural gas and is installed into a modified cylinder head of a gas fueled engine for a light duty truck. For initial pre-chamber ignition tests and optimizations, the engine is modified into a single cylinder one. The pre-chamber is equipped with a spark plug, fuel supply and a miniature pressure transducer. This arrangement allows a simultaneous crank angle resolved pressure measurement in the pre-chamber and in the main combustion chamber and provides important validation data for computational fluid dynamics (CFD) simulations. The results of the tests and initial optimizations show that the pre-chamber engine is able to operate within a significantly wider range of mixture composition than the conventional spark ignition engine. Full load operation of the pre-chamber engine is feasible with stoichiometric mixture (compatible with a three-way catalyst), without excessive thermal loading of components. At low load operation, the results show low NOx emissions with a high potential to fulfil current and future NOx limits without lean NOx exhaust gas after-treatment. The scavenged pre-chamber helps to increase the combustion rate mainly in the initial phase of combustion. However, significant unburned hydrocarbons emissions due to incomplete combustion need further optimizations. Thermal efficiency of lean operation of the engine with the pre-chamber compared to the conventional spark ignition system operated in stoichiometric conditions shows approximately 13% improvement.

Influence of exhaust residuals on combustion phases, exhaust toxic emission and fuel consumption from a natural gas fueled spark-ignition engine

2018 ◽  
Vol 165 ◽  
pp. 440-446 ◽  
Author(s):  
Stanislaw Szwaja ◽  
Ehsan Ansari ◽  
Sandesh Rao ◽  
Magdalena Szwaja ◽  
Karol Grab-Rogalinski ◽  
...  
Keyword(s):  
Natural Gas ◽  
Fuel Consumption ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Toxic Emission ◽  
Gas Fueled

Two-Stage Lean-Burn Combustion Inside a Natural-Gas Spark-Ignition Engine With a Bowl-in-Piston Chamber

2019 ◽  
Author(s):  
Jinlong Liu ◽  
Cosmin E. Dumitrescu
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Combustion Process ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Intake Manifold ◽  
Hydrocarbon Emissions ◽  
Fuel Injector ◽  
Unburned Hydrocarbon ◽  
Piston Chamber

Abstract The conversion of existing diesel engines to spark ignition (SI) operation by adding a low-pressure injector in the intake manifold for fuel delivery and replacing the original high-pressure fuel injector with a spark plug to initiate and control the combustion process can reduce U.S. dependence on petroleum imports and increase natural gas (NG) applications in heavy-duty transportation sectors. Since the conventional diesel combustion chamber (i.e., flat-head-and-bowl-in-piston-chamber) creates high turbulence, the converted NG SI engine can operate leaner with stable and repeatable combustion process. However, existing literatures point to a long late-combustion duration and increased unburned hydrocarbon emissions in such retrofitted engines that maintained the original combustion chamber. Consequently, the main objective of this paper was to report recent findings of NG combustion characteristics inside a bowl-in-piston combustion chamber that will add to the general understanding of the phenomena. The new results indicated that the premixed NG burn inside the bowl-in-piston combustion chamber will separate into a bowl-burn and a squish-burn processes in terms of burning location and timing. The slow burning event in the squish region explains the low slope of the burn rate towards the end of combustion in existing studies (hence the longer late-combustion period). In addition, the less-favorable conditions for the combustion in the squish region explained the increased carbon monoxide and unburned hydrocarbon emissions.

scholarly journals Effects of Piston Design and Inlet Gas flow on the Performance and Exhaust Emissions in a Natural Gas Fueled Spark Ignition Engine.

1999 ◽  
Vol 65 (632) ◽  
pp. 1485-1490
Author(s):  
Katsumi KATAOKA ◽  
Yoshitaka ATSUMI ◽  
Daisuke SEGAWA ◽  
Toshikazu KADOTA ◽  
Yukiyoshi FUKANO
Keyword(s):  
Natural Gas ◽  
Gas Flow ◽  
Exhaust Emissions ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Gas Fueled
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