Experimental study on thermal efficiency and emission characteristics of a lean burn hydrogen enriched natural gas engine

Ma, Fenglong; Wang, Yu; Liu, Haiquan; Li, Yong; Wang, Junjun; Zhao, Shikai

doi:10.1016/j.ijhydene.2007.07.048

Cited by 326 publications

(80 citation statements)

References 15 publications

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“…Figure 2. In-cylinder pressure, predicted and experimental (Ma et al, 2007) In Figure 3, it is obvious that the spark time has a significant effect on the maximum pressure. As can be seen from the figure, when the spark time for the mixture blend of 30% ethane and 70% methane is at 330 deg, the peak pressure will be around 92 bar.…”

Section: Resultsmentioning

confidence: 99%

“…The engine specifications are presented in Table 1, and Figure 1 shows the computational domain which was used for calculations. Figure 2, the numerical and experimental results (Ma et al, 2007) for cylinder pressure are compared. The simulation model is validated by comparing the predicted cylinder pressure and experimental cylinder pressure under the condition of full load, 1200 r/min for fuel blends of 30% hydrogen fractions.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

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

View full text Add to dashboard Cite

show abstract

“…The fuel economy and thermal efficiency can also be increased by the addition of hydrogen. The thermal efficiency of hydrogen enriched natural gas is covered in more detail in Ma et al (2007).…”

Section: Advantagesmentioning

confidence: 99%

Hydrogen-Enriched Compressed Natural Gas as a Fuel for Engines

Ma¹,

Naeve²,

Wang³

et al. 2010

Natural Gas

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“…However, an increase in NOx emission was obtained in the process due to the increase in the combustion temperature. They further showed that by modifying the ignition timing, the NOx emission could be reduced to that similar to the original fuelling system (Ma et al, 2007). …”

Section: Introductionmentioning

confidence: 99%