Optimization on Ignition Timing and EGR Ratio of a Spark-Ignition Engine Fuelled with Natural Gas-Hydrogen Blends Xi'an Jiaotong Univ

Format:

Conference/Event

Author/Creator:

Hu, Hu, author.

Contributor:

Huang, Zuohua

Conference Name:

SAE 2011 World Congress & Exhibition (2011-04-12 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

In this paper, 20%H₂ (20% hydrogen in natural gas-hydrogenblends, by volume) is selected as the test fuel, and the ignitiontiming and EGR ratio are adjusted to optimize the performance,combustion, and emissions of a natural gas-hydrogen engine. Anexperimental investigation on the effect of ignition timings, EGRratios on combustion behaviors and emissions of a spark-ignitionengine fuelled with natural-gas and hydrogen blends wasconducted.When increasing the ignition timing at specified EGR ratio,engine power output will give its peak value at MBT timing. LargeEGR introduction decreases engine power output and increasescombustion duration. Effective thermal efficiency shows anincreasing trend at the small EGR ratio and a decreasing trend withfurther increasing EGR ratio.With advancing the ignition timing, the flame developmentduration is increased, and the rapid combustion duration and totalcombustion duration are decreased. All of these three kinds ofcombustion duration are increased with the increase of EGRratio.HC concentration is decreased and NOx concentration is increasedwith advancing the ignition timing while CO emission varies littlewith the ignition timing. NOx concentration is decreased with theincrease of EGR ratio. HC emission is increased with the increaseof EGR ratio. CO and CO₂ emissions show little variations with theEGR ratio and ignition timing.Based on the above analysis, a MAP containing ignition timingsand EGR ratios for 20%H₂ fuel blend is presented, and this willprovide the reference and guidance to engine designers andengineers. In addition, through optimizing ignition timing and EGRratio, high efficiency and low emission spark-ignition engine canbe realized fueled with natural gas-hydrogen blends

Notes:

Vendor supplied data

Publisher Number:

2011-01-0918

Access Restriction:

Restricted for use by site license