Natural Gas Autoignition Under Diesel Conditions: Experiments and Chemical Kinetic Modeling

Naber, Jeffrey; Siebers, Dennis L.; Caton, Jerry A.; Westbrook, Charles K.; Julio, S. S. Di

doi:10.4271/942034

Cited by 59 publications

(46 citation statements)

References 21 publications

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“…Hydrogen addition to the fuel results in an increase in ignitability for the gaseous fuel, and a corresponding reduction in ignition delay [30]. The effects of ethane and propane are similar to those of hydrogen; the fuel is more ignitable, leading to reduced ignition delays; this agrees with previous work on homogeneous charge engines [7,16]. The absence of these species in the pure methane case leads to the observed increase in GID.…”

Section: Combustion Processsupporting

confidence: 87%

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The influence of fuel composition on a heavy-duty, natural-gas direct-injection engine

McTaggart-Cowan

Rogak

Munshi³

et al. 2010

Fuel

103

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This work investigates the implications of natural gas composition on the combustion in a heavy-duty natural gas engine and on the associated pollutant emissions. In this engine system, natural gas is injected into the combustion chamber shortly before the end of the compression stroke; a diesel pilot that precedes the natural gas injection provides the ignition source. The effects of adding ethane, propane, hydrogen, and nitrogen to the fuel are reported here. The results indicate that these additives had no significant effect on the engine's power or fuel consumption. Emissions of unburned fuel are reduced for all additives through either enhanced ignition or combustion processes. Black carbon particulate matter emissions are increased by ethane and propane, but are virtually eliminated by including nitrogen or hydrogen in the fuel.

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Section: Combustion Processsupporting

confidence: 87%

“…At lower temperatures, the addition of either ethane or propane is found to reduce ignition delay times by as much as 0.7 ms [16]. However, there is a limit to the effectiveness of improved kinetics, especially at higher temperatures; beyond a certain point mixing limitations dominate the ignition processes.…”

Section: Effect Of Heavy Hydrocarbonsmentioning

confidence: 99%

The influence of fuel composition on a heavy-duty, natural-gas direct-injection engine

McTaggart-Cowan

Rogak

Munshi³

et al. 2010

Fuel

103

View full text Add to dashboard Cite

show abstract

“…The experimental work of Naber et al [6] was used for model validation. In their work, the authors determined ignition delay times for methane injected into a constant-volume chamber at high pressures and temperatures.…”

Section: Experimental Workmentioning

confidence: 99%

“…The value of 14 kPa corresponded to heat release by burning 0.33 mg of fuel or 2.5% of the total mass of fuel injected. The measured pressure delay data was fit to the following ignition delay correlation [6]:…”

Section: Experimental Workmentioning

confidence: 99%

Modeling of chemical and mixing effects on methane autoignition under direct-injection, stratified charged conditions

Hong

Wooldridge

Assanis

2002

Proceedings of the Combustion Institute

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Fundamental experiments and direct numerical simulations indicate that reaction rates during the ignition delay of direct-injection, stratified charge mixtures are determined by both chemical reaction and mixing rates. Consequently, the commonly used, purely chemistry-dependent approach for predicting ignition is no longer valid when the mixing rate limits the reaction rates. This work proposes an improved approach for predicting the reaction rates during ignition delay which accounts for both chemistry and mixing. Initially, reaction rates are determined using only the chemical reaction rate. Subsequently, a transition is made to the use of a modified eddy dissipation concept in which reaction rates are determined based on interaction between chemical reaction rates and mixing rates. To illustrate and validate the model, compression ignition under stratified charged conditions is considered for methane/air mixtures with temperatures ranging from 1200 to 1500 K. The predictions agree well with the experimental results qualitatively as well as quantitatively. Furthermore, by comparing our approach against a chemistry-only model, conditions where mixing plays an important role in predicting reaction rates during the ignition period are identified.

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“…At temperatures >1400 K, fuel additives have little effect as this process is mixing limited (Naber, Siebers, Westbrook, Caton, & DiJulio, 1994). At lower temperatures, the addition of either ethane or propane is found to reduce ignition delay times by as much as 0.7 ms (Naber et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Additives to Natural Gas on Heavy-Duty SI Engine Combustion Characteristics

Gharehghani¹,

Hosseini²,

Yusaf³

2013

J MECH ENG SCI

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This work investigates the implications of natural-gas composition on the combustion in a heavy-duty natural-gas engine and on the associated pollutant emissions. Natural gas is injected in ports and mixes with air before entering the cylinder. For the ignition source, both a spark plug and diesel pilot, which is injected before the top-dead center in the cylinder, are used. The effect of additives such as hydrogen, ethane and nitrogen on the output power and efficiency of the engine and emission levels are examined. The results indicate that these additives had no significant effect on the engine's power or fuel consumption. Emissions of unburned fuel are reduced for all additives through either enhanced ignition or combustion processes. Adding ethane and H 2 to the fuel increases the in-cylinder pressure and NOx emission, while fuel dilution with N 2 has a critical amount. Black carbon particulate matter emissions are increased by ethane, but are virtually eliminated by including nitrogen or hydrogen in the fuel. The results show the higher flame speed of ethane compared to hydrogen, and hydrogen compared to methane. Thus, to reach the MBT condition, the spark time of ethane is the most retarded one and for methane it is the most advanced.

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Natural Gas Autoignition Under Diesel Conditions: Experiments and Chemical Kinetic Modeling

Cited by 59 publications

References 21 publications

The influence of fuel composition on a heavy-duty, natural-gas direct-injection engine

The influence of fuel composition on a heavy-duty, natural-gas direct-injection engine

Modeling of chemical and mixing effects on methane autoignition under direct-injection, stratified charged conditions

Investigation of the Effect of Additives to Natural Gas on Heavy-Duty SI Engine Combustion Characteristics

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