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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Effect of Injection Timing on PPCI and MPCI Mode Fueled With Straight-Run Naphtha

[+] Author and Article Information
Hongqiang Yang

e-mail: sdjxyhq@163.com

Jianxin Wang

State Key Laboratory of Automotive Safety and Energy,
Tsinghua University,
Haidian District,
Beijing 100084, China

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 4, 2012; final manuscript received August 15, 2013; published online November 5, 2013. Assoc. Editor: Zoran S. Filipi.

J. Eng. Gas Turbines Power 136(3), 031501 (Nov 05, 2013) (7 pages) Paper No: GTP-12-1347; doi: 10.1115/1.4025722 History: Received September 04, 2012; Revised August 15, 2013

Partially premixed compression ignition (PPCI) and multiple premixed compression ignition (MPCI) mode of straight-run naphtha have been investigated under different injection strategies. The MPCI mode is realized by the multiple premixed combustion processes in a sequence of “spray-combustion-spray-combustion” around the compression top dead center. The spray and combustion events are preferred to be completely separated, without any overlap in the temporal sequence in order to ensure the multiple-stage premixed compression ignition. The PPCI mode is well known as the “spray-spray-combustion” sequence, with the start of combustion separated from the end of injection. Straight-run naphtha with a research octane number (RON) of 58.8 is tested in a single cylinder compression ignition engine whose compression ratio is 16.7 and displacement is 0.5 l. Double and triple injection strategies are investigated as the last injection timing sweeping at 1.0 MPa IMEP and 1800 rpm conditions. The MPCI mode is achieved using the double injection strategy, but its soot emission is higher than the PPCI mode under triple injection strategy. This is mainly because of the lower RON of the straight-run naphtha and the ignition delay is too short to form an ideally premixed combustion process after the second injection of straight-run naphtha. Diesel fuel is also tested under the same operating conditions, except for employing a single injection strategy. The naphtha PPCI and MPCI mode both have lower fuel consumption and soot emission than diesel fuel single injection mode, but the THC emissions are both higher than that of diesel fuel.

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Figures

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Fig. 1

Schematic of the spray and combustion sequence for the gasoline MPCI concept

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Fig. 2

Schematic of the spray and combustion sequence for the gasoline PPCI concept

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Fig. 3

Expected path of the gasoline MPCI combustion process in the ϕ-T diagram

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Fig. 4

Schematic of the experimental apparatus

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Fig. 5

Heat release rate, mean gas temperature, and in-cylinder pressure of the diesel single injection mode as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 6

Heat release rate, mean gas temperature, and in-cylinder pressure of the straight-run naphtha MPCI mode as the second injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 7

Heat release rate, mean gas temperature, and in-cylinder pressure of the straight-run naphtha PPCI mode as the third injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 8

Maximum pressure rise rate of the diesel single injection, straight-run naphtha MPCI, and PPCI modes as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 9

Indicated specific fuel consumption of the diesel single injection, straight-run naphtha MPCI, and PPCI modes as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 10

Indicated efficiency of the diesel single injection, straight-run naphtha MPCI, and PPCI modes as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 11

Indicated specific NOx emission of the diesel single injection, straight-run naphtha MPCI, and PPCI modes as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 12

Light absorption coefficient of the diesel single injection, straight-run naphtha MPCI, and PPCI modes as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 13

Indicated specific THC emission of the diesel single injection, straight-run naphtha MPCI, and PPCI modes as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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Fig. 14

Indicated specific CO emission of the diesel single injection, straight-run naphtha MPCI, and PPCI modes as injection timing sweeping at 1800 rpm, 1.0 MPa IMEP, and a 20% EGR rate

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