Flame development analysis in a diesel optical engine converted to spark ignition natural gas operation

Liu, Jinlong; Dumitrescu, Cosmin E.

doi:10.1016/j.apenergy.2018.09.059

Cited by 112 publications

(25 citation statements)

References 32 publications

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“…The combustion proceeds quickly in the bowl due to the high turbulence level. This is a decisive factor in early flame development period and burn duration [25,26]. As mentioned above, the combustion chamber shapes on the piston are effective on spark advance, ignition delay, and flame development period.…”

Section: Combustion Analysismentioning

confidence: 93%

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Investigation of Burn Duration and NO Emission in Lean Mixture with CNG and Gasoline

et al. 2019

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The results of experiments performed by gasoline and natural gas fuels in a single cylinder research engine were evaluated in this study. The main objective of this study is to compare exhaust gas emissions, efficiency, and burn durations for both fuels in stoichiometric and lean mixture. At the same time, cycle to cycle variation in these operating conditions should not exceed an acceptable value. In the ultra-lean mixture, gasoline fuel exceeded this determined limit before Compressed Natural Gas (CNG). Therefore, the reduction in NO was restricted by cyclic variations. In combustion analysis, although the burn duration of the gasoline in stoichiometric conditions was shorter than CNG, this situation reversed in favor of CNG in the ultra-lean mixtures. Contrary to some studies in the literature, the spark advance and ignition delay for CNG were the same or shorter than gasoline in this study. The primary reasons for this change are the high compression ratio and the different combustion chamber geometry. The increase in turbulence intensity has different effects on CNG and gasoline. As a result, it has been observed that NO emissions can meet the limits without a loss of efficiency for this engine operated with CNG under the ultra-lean mixture.

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Section: Combustion Analysismentioning

confidence: 93%

“…The combustion proceeds quickly in the bowl due to the high turbulence level. This is a decisive factor in early flame development period and burn duration [26,27]. CNG_5bar Gasoline_5bar Figure 10.…”

Section: Combustion Analysismentioning

confidence: 99%

Investigation of Burn Duration and NO Emission in Lean Mixture with CNG and Gasoline

et al. 2019

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“…Heavy duty SI Gas engines for trucks and buses are usually made based on diesel engines. To convert a diesel engine into a SI gas engine, it is necessary to replace the diesel fuel supply system with a gas fuel supply system (central or distributed type) and install a spark ignition system [2,3]. Despite the high octane number of compressed natural gas (CNG) (about 115), the main goal of the combustion process is to avoid knocking and reduce its probability, which is still very high because of several design and other characteristics:…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of Knock Onset in a Heavy-Duty Spark Ignition Gas Engine

Kozlov,

Terenchenko,

Zuev

et al. 2019

IJRTE

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 Abstract: The paper describes a method for evaluating knocking onset with computational fluid dynamics (CFD) numerical model of the combustion process of spark ignited (SI) gas engine and methods for assessing the probability of knocking combustion based on this model. The probability of knocking combustion, which characterizes the boundary condition between normal combustion and knocking, is determined (8%). An optimization study of the influence of adjustment parameters on the probability of knocking based on a three-dimensional numerical model is carried out. The developed and tested technique allows one to monitor the tendency of the influence of various adjustment parameters on the probability of knocking in a SI gas engine. Keywords: natural gas, spark ignition gas engine, knock onset, computational fluid dynamic, combustion process, start of combustion test bench, knocking probability, knock index.

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“…Heavy duty SI Gas engines for trucks and buses are usually made based on diesel engines. To convert a diesel engine into a SI gas engine, it is necessary to replace the diesel fuel supply system with a gas fuel supply system (central or distributed type) and install a spark ignition system [2], [3]. Despite the high-octane number of CNG (about 115), the main goal of the combustion process is to avoid knocking and reduce its probability, which is still very high because of several design and other characteristics:-problems with filling the cylinders with a fresh air arise due to the installation of the throttle which is necessary to organize the exact air excess ratio of the air-fuel mixture.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research and Computer Simulation of Knock Onset in a Heavy-Duty Si Gas Engine

Kozlov¹,

Теренченко²,

Zuev³

et al. 2019

IJITEE

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The work describes the properties of natural gas as a engine fuel, as well as a method for evaluating knocking combustion at a test bench, a 3D numerical model of the combustion process of spark ignited (SI) gas engine and methods for assessing the probability of knocking combustion based on this model. The probability of knocking combustion, which characterizes the boundary condition between normal combustion and knocking, is determined (8%). An optimization study of the influence of adjustment parameters on the probability of knocking based on a three-dimensional numerical model is carried out. The developed and tested technique allows one to monitor the tendency of the influence of various adjustment parameters on the probability of knocking in a SI gas engine

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Flame development analysis in a diesel optical engine converted to spark ignition natural gas operation

Cited by 112 publications

References 32 publications

Investigation of Burn Duration and NO Emission in Lean Mixture with CNG and Gasoline

Investigation of Burn Duration and NO Emission in Lean Mixture with CNG and Gasoline

CFD Simulation of Knock Onset in a Heavy-Duty Spark Ignition Gas Engine

Experimental Research and Computer Simulation of Knock Onset in a Heavy-Duty Si Gas Engine

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