Investigation on idle performance of a spark-ignited ethanol engine with dimethyl ether addition

Ji, Changwei; Chen, Liang; Zhu, Yongming; Liu, Xiaolong; Gao, Bin

doi:10.1016/j.fuproc.2011.10.006

Cited by 38 publications

(11 citation statements)

References 25 publications

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“…In addition, the base of the jet flame was light blue and the brightness was relatively weak in this experiment. The dimethyl ether burnt to emit blue light due to oxidation of formaldehyde to CO 13 (as shown in equation (5)). The soot in the flame glowed when heated, which was the main source of diffused flame illuminants.…”

Section: Liftoff Behaviors Of Dme Jet Flames Under Vitiated Coflow Comentioning

confidence: 99%

“…4 Based on its lower emissions, the researches of DME were mainly focused on the alternative fuels for internal combustion engines. Ji et al 5 added DME to the spark-ignited ethanol engine and the results showed that the thermal efficiency increased and the flame development and propagation durations were shortened with the increase of DME fraction. Wang et al 6 examined the combustion and emissions characteristics of a DME premixed charge compression ignition diesel engine.…”

Section: Introductionmentioning

confidence: 99%

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Liftoff behaviors and flame structure of dimethyl ether jet flame in CH₄/air vitiated coflow

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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The objective of this paper is to investigate the flame structure and liftoff behaviors of a dimethyl ether central jet in CH4/air vitiated coflow in a coflow burner. The liftoff behaviors of dimethyl ether jet flames in the air flow were studied firstly. The flame stability of the burner was analyzed by measuring the flow field temperature with thermocouples. By changing the coflow rate and CH4 equivalence ratio, the liftoff behaviors of dimethyl ether jet flames under different vitiated coflow environments were discussed. The jet flame structure was also analyzed qualitatively by high-speed photography.

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Section: Liftoff Behaviors Of Dme Jet Flames Under Vitiated Coflow Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liftoff behaviors and flame structure of dimethyl ether jet flame in CH₄/air vitiated coflow

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Like diesel fuel, dimethyl ether (DME) has low auto-ignition temperature and high cetane number in the range from 55 to 60. 19 But DME could vaporize almost instantaneously after being injected into the cylinder at much lower injection pressure of 40–100 bar than the diesel injection (>1000 bar), due to its low boiling point at 248.1 K and critical evaporation temperature at 400 K, respectively. 20 Besides, its lack of C–C bonds and high oxygen content can achieve soot-free combustion due to low formation and high oxidation rates.…”

Section: Introductionmentioning

confidence: 99%

Multi-point micro-flame ignited hybrid lean-burn combustion of gasoline with direct injection dimethyl ether

et al. 2019

International Journal of Engine Research

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Lean-burn combustion is effective in reducing fuel consumption of gasoline engines because of the higher specific heat ratio of the fuel lean mixture and reduced heat loss from lower combustion temperature. However, its application to real engines is hampered by the unstable ignition, high cyclic variability, and partial-burn due to slower combustion, as well as the restricted maximum lean-burn air/fuel ratio limit and the insufficiently low nitrogen oxides emission. Multi-point micro-flame-ignited hybrid combustion has been proposed and applied to extend the lean burn limit of premixed gasoline and air mixture. To achieve micro-flame-ignited combustion in premixed lean gasoline mixture formed by port fuel injection, a small amount of dimethyl ether is injected directly into the cylinder of a four-stroke gasoline engine to control and accelerate the ignition and combustion process so that the engine could be operated with the overall excess air coefficient (Lambda) of 1.9. The results show that heat release processes can be grouped into three forms, that is, ramp type, double-peak type, and trapezoid type. Regardless of single or split injections, direct injection timing of dimethyl ether dominates the features of heat release. The ramp type occurs at early injection timing while the double-peak type takes place at late injection timing. Trapezoid type appears between the above two types. Dimethyl ether injection timing controls the ignition timing and has less effect on combustion duration. Single injection of dimethyl ether leads to much earlier ignition timing and slightly longer combustion duration, forming higher nitrogen oxides emissions than the split injections. Ultra-low nitrogen oxides emissions and higher thermal efficiency are achieved in the ramp type combustion compared to the other two types of combustion in both injection approaches.

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“…In the work by Herrmann et al, 17 the low-temperature oxidation characteristics of ethanol and DME were compared in an atmospheric-pressure laminar flow reactor, and a distinct negative-temperature-coefficient region was observable only for DME. In some research studies, [18][19][20] DME was introduced as an enrichment to improve the economical and emissions performance of spark ignition ethanol engines. Also, as expected, ethanol can be used in DME HCCI engines for controlling the combustion phase and extending the engine load range.…”

Section: Introductionmentioning

confidence: 99%

Effect of the addition of ethanol on the combustion and emission characteristics of a common-rail dimethyl ether engine

Chun-hai

Qiao

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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The effect of the addition of ethanol on the combustion and emission characteristics of dimethyl ether combustion were investigated in this study using an electronically controlled common-rail dimethyl ether engine. The ignition delay, the crank angle for 50% mass fraction burned, the combustion duration, the nitrogen oxide emissions, the hydrocarbon emissions and the carbon monoxide emissions of the fuel blends with the addition of different percentages of ethanol were analysed for different loads and for different injection timings separately. The results suggest that the effect of ethanol on the dimethyl ether combustion mainly prolongs the ignition delay and inhibits the combustion rate. The ignition delay is prolonged significantly with increasing percentage of ethanol added for low loads or retarded injection timings. A reduction in the combustion rate and an increase in the combustion duration are associated with a higher percentage of ethanol added for high loads or advanced injection timings, leading to lower nitrogen oxide emissions. On the addition of 15% ethanol, the nitrogen oxide emissions are reduced by about 17% for a brake mean effective pressure of 1.2 MPa, and by 32% when the start of injection is at −7° crank angle after top dead centre. Premixed combustion with a sharply prolonged ignition delay and a shortened combustion duration can be achieved by the addition of 15% ethanol when the start of injection is at 5° crank angle after top dead centre. The carbon monoxide emissions show a tendency to increase with increasing amount of ethanol added, whereas the hydrocarbon emissions remain nearly the same until the percentage of ethanol reaches 15%.

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Investigation on idle performance of a spark-ignited ethanol engine with dimethyl ether addition

Cited by 38 publications

References 25 publications

Liftoff behaviors and flame structure of dimethyl ether jet flame in CH₄/air vitiated coflow

Liftoff behaviors and flame structure of dimethyl ether jet flame in CH₄/air vitiated coflow

Multi-point micro-flame ignited hybrid lean-burn combustion of gasoline with direct injection dimethyl ether

Effect of the addition of ethanol on the combustion and emission characteristics of a common-rail dimethyl ether engine

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Investigation on idle performance of a spark-ignited ethanol engine with dimethyl ether addition

Cited by 38 publications

References 25 publications

Liftoff behaviors and flame structure of dimethyl ether jet flame in CH4/air vitiated coflow

Liftoff behaviors and flame structure of dimethyl ether jet flame in CH4/air vitiated coflow

Multi-point micro-flame ignited hybrid lean-burn combustion of gasoline with direct injection dimethyl ether

Effect of the addition of ethanol on the combustion and emission characteristics of a common-rail dimethyl ether engine

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Liftoff behaviors and flame structure of dimethyl ether jet flame in CH₄/air vitiated coflow

Liftoff behaviors and flame structure of dimethyl ether jet flame in CH₄/air vitiated coflow