Numerical Study of Effect of Injection Parameters on Combustion and Emission Performance of a Direct Injection Diesel-Natural Gas Engine

By using AVL FIRE code, three-dimensional numerical simulations of the diesel-natural gas injection characteristics in a direct injection diesel-natural gas engine were conducted. The effects of the start of injection (SOI) of the pilot diesel and natural gas injection velocity on combustion and emission performance were investigated. The results showed that diesel-natural gas injection characteristics have an important influence on the subsequent combustion and emission. NO and Soot emission performance is better when the SOI was 36°BTDC (Before Top Dead Center), and a larger natural gas injection velocity usually leads to a lower engine economical efficiency.

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Effects of Hydrogen Addition on the Performance of a Pilot-Ignition Direct-Injection Natural Gas Engine: A Numerical Study

Energy & Fuels ◽

10.1021/acs.energyfuels.6b02935 ◽

2017 ◽

Vol 31 (4) ◽

pp. 4407-4423 ◽

Cited By ~ 13

Author(s):

Menghan Li ◽

Qiang Zhang ◽

Guoxiang Li ◽

Peixin Li

Keyword(s):

Natural Gas ◽

Numerical Study ◽

Direct Injection ◽

Gas Engine ◽

Natural Gas Engine ◽

Hydrogen Addition

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Numerical Study on Effect of Injection Rates on Combustion and Emission Performance

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.860-863.1357 ◽

2013 ◽

Vol 860-863 ◽

pp. 1357-1361

Author(s):

Zhou Rong Zhang ◽

Qian Wang ◽

Zhi Xia He ◽

Li Ming Dai

Keyword(s):

Natural Gas ◽

Numerical Study ◽

Three Dimensional ◽

Injection Rate ◽

Gas Engine ◽

Natural Gas Engine ◽

Diesel Jets ◽

Diesel Injection ◽

Engine Combustion ◽

Injection Rates

As a study of natural gas engine, three-dimensional numerical simulations of diesel injection rates were conducted by using AVL FIRE code. And particularly the effects of the injection rates in the pilot diesel jets on the engine combustion and emission were analyzed. It is found that injection rate in the pilot diesel jets plays an important role on the emission, and slow ending rate of the injection keeps lower NO and Soot.

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Numerical Simulations of Natural Gas Injection Pressure Effects on a Direct Injected, Pilot Ignited, Natural Gas Engine

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.510.179 ◽

2014 ◽

Vol 510 ◽

pp. 179-184 ◽

Cited By ~ 1

Author(s):

Ying Gao ◽

Xiao Xiao Li ◽

Jun Li ◽

Lei Zhang ◽

Shu Hua Li

Keyword(s):

Natural Gas ◽

Direct Injection ◽

Gas Injection ◽

Combustion Process ◽

Injection Pressure ◽

Pressure Effects ◽

Compression Ignition Engine ◽

Gas Engine ◽

Natural Gas Engine ◽

Hc Emissions

Pilot-ignited direct injection of natural gas fueling of a compression ignition engine has been shown to keep high thermal efficiency as diesel engines. To further investigate the combustion process, the effect of natural gas injection pressure on combustion in a diesel engine fueled with pilot-ignited directly-injected natural gas was studied by multidimensional simulations while engine speed and other injection parameters were held constant. NO emissions are increased by higher gas injection pressure without significantly affecting cylinder pressure. By increasing gas injection pressure, HC emissions are reduced with the increase of cylinder temperature. The data got contributes to the development of the pilot-ignited high pressure direct injection natural gas engine.

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