Abstract
To improve the thermal efficiency of internal combustion engines at high loads, premixed mixture ignition in the end-gas region (PREMIER) combustion is proposed as a precursor to knocking. In the current work, a pilot fuel-ignited dual-fuel gas engine was operated at constant speed under different intake pressures (101, 150, and 200 kPa). A simulated biogas was served as the primary fuel and diesel as the pilot fuel. The maximum mean effective pressure and thermal efficiency were evident during PREMIER operation because of autoignition in the end-gas region. Similar to knocking combustion, PREMIER combustion features two stages but neither pressure oscillation nor a rapid pressure rise is observed. We here define a new parameter, the PREMIER intensity (PI), which reflects the strength of PREMIER combustion. As the injection timing was advanced and the pressure boosted, more cycles underwent end-gas autoignition; the associated heat release increased and, consequently, the PI value rose. When the pressure and temperature of a premixed fuel mixture rose as injection timing was advanced, end-gas autoignition commenced earlier. The end-gas autoignition delay became shorter as intake pressure was increased and injection timing advanced.
| Original language | English |
|---|---|
| Article number | 115634 |
| Journal | Fuel |
| Volume | 254 |
| DOIs | |
| Publication status | Published - Oct 15 2019 |
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Keywords
- Autoignition
- Biogas
- Dual-fuel engine
- Pilot injection
- Thermal efficiency
ASJC Scopus subject areas
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry
Cite this
End-gas autoignition characteristics of PREMIER combustion in a pilot fuel-ignited dual-fuel biogas engine. / Valipour Berenjestanaki, Alireza; Kawahara, Nobuyuki; Tsuboi, Kazuya; Tomita, Eiji.
In: Fuel, Vol. 254, 115634, 15.10.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - End-gas autoignition characteristics of PREMIER combustion in a pilot fuel-ignited dual-fuel biogas engine
AU - Valipour Berenjestanaki, Alireza
AU - Kawahara, Nobuyuki
AU - Tsuboi, Kazuya
AU - Tomita, Eiji
PY - 2019/10/15
Y1 - 2019/10/15
N2 - To improve the thermal efficiency of internal combustion engines at high loads, premixed mixture ignition in the end-gas region (PREMIER) combustion is proposed as a precursor to knocking. In the current work, a pilot fuel-ignited dual-fuel gas engine was operated at constant speed under different intake pressures (101, 150, and 200 kPa). A simulated biogas was served as the primary fuel and diesel as the pilot fuel. The maximum mean effective pressure and thermal efficiency were evident during PREMIER operation because of autoignition in the end-gas region. Similar to knocking combustion, PREMIER combustion features two stages but neither pressure oscillation nor a rapid pressure rise is observed. We here define a new parameter, the PREMIER intensity (PI), which reflects the strength of PREMIER combustion. As the injection timing was advanced and the pressure boosted, more cycles underwent end-gas autoignition; the associated heat release increased and, consequently, the PI value rose. When the pressure and temperature of a premixed fuel mixture rose as injection timing was advanced, end-gas autoignition commenced earlier. The end-gas autoignition delay became shorter as intake pressure was increased and injection timing advanced.
AB - To improve the thermal efficiency of internal combustion engines at high loads, premixed mixture ignition in the end-gas region (PREMIER) combustion is proposed as a precursor to knocking. In the current work, a pilot fuel-ignited dual-fuel gas engine was operated at constant speed under different intake pressures (101, 150, and 200 kPa). A simulated biogas was served as the primary fuel and diesel as the pilot fuel. The maximum mean effective pressure and thermal efficiency were evident during PREMIER operation because of autoignition in the end-gas region. Similar to knocking combustion, PREMIER combustion features two stages but neither pressure oscillation nor a rapid pressure rise is observed. We here define a new parameter, the PREMIER intensity (PI), which reflects the strength of PREMIER combustion. As the injection timing was advanced and the pressure boosted, more cycles underwent end-gas autoignition; the associated heat release increased and, consequently, the PI value rose. When the pressure and temperature of a premixed fuel mixture rose as injection timing was advanced, end-gas autoignition commenced earlier. The end-gas autoignition delay became shorter as intake pressure was increased and injection timing advanced.
KW - Autoignition
KW - Biogas
KW - Dual-fuel engine
KW - Pilot injection
KW - Thermal efficiency
UR - http://www.scopus.com/inward/record.url?scp=85068184734&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85068184734&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2019.115634
DO - 10.1016/j.fuel.2019.115634
M3 - Article
AN - SCOPUS:85068184734
VL - 254
JO - Fuel
JF - Fuel
SN - 0016-2361
M1 - 115634
ER -