Numerical prediction of effects of CO2 or H2 content on combustion characteristics and generation efficiency of biogas-fueled engine generator |
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Authors: | Sung Yong Jung Jungsoo Park |
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Affiliation: | Department of Mechanical Engineering, Chosun University, Kwangju, 61452, Republic of Korea |
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Abstract: | The fundamental effect of additives and the lean burn capability of methane combustion are investigated using cycle simulation and Latin hypercube sampling. The target engine is a spark-ignition engine fueled by methane and biogas mixed with hydrogen. The dominant variables were CO2 and H2 content, spark timing, and excess air ratio (EAR). Varying the amount of additives (CO2 and H2), spark timing, and EAR demonstrated that hydrogen plays an important role in extending the lean operating limit. The fractional factorial design of the experiment, Latin hypercube sampling, was applied to obtain the maximum brake torque (MBT) spark timing with variants in excess air ratios and additive content. When MBT spark timing is employed, the maximum mass fraction burned can be enhanced in the lean-burn region by increasing the hydrogen content with improved generating efficiencies under lean operating conditions. |
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Keywords: | Methane Carbon dioxide Hydrogen Cycle simulation Latin hypercube sampling Design of experiment ATDC After top dead center BTDC Before top dead center CA Crank angle Carbon dioxide DoE Design of experiment EAR Excess air ratio MBT Maximum brake torque MFB Mass fraction burned Nitric oxides TDC Top dead center |
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