A parametric investigation of diesel/methane dual-fuel combustion progression/stages in a heavy-duty optical engine

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@article{c32432a64ee54528a9178cf208b96dcc,
title = "A parametric investigation of diesel/methane dual-fuel combustion progression/stages in a heavy-duty optical engine",
abstract = "A single-cylinder heavy-duty optical engine is used to characterize dual-fuel (DF) combustion. In experiments, methane is applied as the main fuel while directly injected pilot diesel ignites the premixed methane-air mixture close to the top-dead center (TDC). In the present study, diesel-methane DF combustion is analyzed as a function of (1) the methane equivalence ratio, (2) initial charge temperature, and (3) the quantity of pilot diesel. Experiments are conducted at 1400 rpm and a load of 9–10 bar IMEP, and DF combustion is visualized in the engine through Bowditch-designed optical access. Meanwhile, a high-speed camera records temporally resolved natural luminosity (NL) color images of the combustion event. The results of the study suggest that DF combustion based on the apparent heat release rate (HRR) data consists of three overlapping combustion stages, where the level of overlap depends on mixture fractions of both pilot-diesel and methane in the in-cylinder charge. The stages are identified by analyzing the second derivative of HRR data. The study revealed that during the first stage, most of the pilot diesel burns in the premixed mode, and that the ignition delay time (IDT) directly influences the burnt charge mixture fraction of pilot diesel and entrained premixed methane-air mixture. In addition, the first-stage combustion is visualized as initial flame kernels originating from pilot-diesel sprays. IDT is found to be especially sensitive to the methane equivalence ratio and initial charge temperature. Furthermore, the concentration of methane and the quantity of pilot diesel in the charge distinctively influence combustion duration trends.",
keywords = "Combustion progression/stages, Dual-fuel, Natural luminosity imaging, Optical engine analysis, Second derivative HRR analysis",
author = "Zeeshan Ahmad and Ossi Kaario and Cheng Qiang and Ville Vuorinen and Martti Larmi",
note = "| openaire: EC/H2020/634135/EU//HERCULES-2",
year = "2019",
month = "6",
day = "5",
doi = "10.1016/j.apenergy.2019.04.187",
language = "English",
volume = "251",
journal = "Applied Energy",
issn = "0306-2619",

}

RIS - Lataa

TY - JOUR

T1 - A parametric investigation of diesel/methane dual-fuel combustion progression/stages in a heavy-duty optical engine

AU - Ahmad, Zeeshan

AU - Kaario, Ossi

AU - Qiang, Cheng

AU - Vuorinen, Ville

AU - Larmi, Martti

N1 - | openaire: EC/H2020/634135/EU//HERCULES-2

PY - 2019/6/5

Y1 - 2019/6/5

N2 - A single-cylinder heavy-duty optical engine is used to characterize dual-fuel (DF) combustion. In experiments, methane is applied as the main fuel while directly injected pilot diesel ignites the premixed methane-air mixture close to the top-dead center (TDC). In the present study, diesel-methane DF combustion is analyzed as a function of (1) the methane equivalence ratio, (2) initial charge temperature, and (3) the quantity of pilot diesel. Experiments are conducted at 1400 rpm and a load of 9–10 bar IMEP, and DF combustion is visualized in the engine through Bowditch-designed optical access. Meanwhile, a high-speed camera records temporally resolved natural luminosity (NL) color images of the combustion event. The results of the study suggest that DF combustion based on the apparent heat release rate (HRR) data consists of three overlapping combustion stages, where the level of overlap depends on mixture fractions of both pilot-diesel and methane in the in-cylinder charge. The stages are identified by analyzing the second derivative of HRR data. The study revealed that during the first stage, most of the pilot diesel burns in the premixed mode, and that the ignition delay time (IDT) directly influences the burnt charge mixture fraction of pilot diesel and entrained premixed methane-air mixture. In addition, the first-stage combustion is visualized as initial flame kernels originating from pilot-diesel sprays. IDT is found to be especially sensitive to the methane equivalence ratio and initial charge temperature. Furthermore, the concentration of methane and the quantity of pilot diesel in the charge distinctively influence combustion duration trends.

AB - A single-cylinder heavy-duty optical engine is used to characterize dual-fuel (DF) combustion. In experiments, methane is applied as the main fuel while directly injected pilot diesel ignites the premixed methane-air mixture close to the top-dead center (TDC). In the present study, diesel-methane DF combustion is analyzed as a function of (1) the methane equivalence ratio, (2) initial charge temperature, and (3) the quantity of pilot diesel. Experiments are conducted at 1400 rpm and a load of 9–10 bar IMEP, and DF combustion is visualized in the engine through Bowditch-designed optical access. Meanwhile, a high-speed camera records temporally resolved natural luminosity (NL) color images of the combustion event. The results of the study suggest that DF combustion based on the apparent heat release rate (HRR) data consists of three overlapping combustion stages, where the level of overlap depends on mixture fractions of both pilot-diesel and methane in the in-cylinder charge. The stages are identified by analyzing the second derivative of HRR data. The study revealed that during the first stage, most of the pilot diesel burns in the premixed mode, and that the ignition delay time (IDT) directly influences the burnt charge mixture fraction of pilot diesel and entrained premixed methane-air mixture. In addition, the first-stage combustion is visualized as initial flame kernels originating from pilot-diesel sprays. IDT is found to be especially sensitive to the methane equivalence ratio and initial charge temperature. Furthermore, the concentration of methane and the quantity of pilot diesel in the charge distinctively influence combustion duration trends.

KW - Combustion progression/stages

KW - Dual-fuel

KW - Natural luminosity imaging

KW - Optical engine analysis

KW - Second derivative HRR analysis

UR - http://www.scopus.com/inward/record.url?scp=85066501040&partnerID=8YFLogxK

U2 - 10.1016/j.apenergy.2019.04.187

DO - 10.1016/j.apenergy.2019.04.187

M3 - Article

VL - 251

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

M1 - 113191

ER -

ID: 34641543