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Research Papers: Fuel Combustion

Effects of Fuel Temperature on Injection Process and Combustion of Dimethyl Ether Engine

[+] Author and Article Information
Gao Guangxin

Xi'an Jiaotong University,
No. 28, Xianning Road,
Xi'an 710049, P.R. China

Yuan Zhulin

Xi'an Autotechnology Vocational College,
Xi'an 710038, P.R. China

Wei Yanju

e-mail: weiyanju@mail.xjtu.edu.cn
Xi'an Jiaotong University,
No. 28, Xianning Road,
Xi'an 710049, P.R. China

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 22, 2012; final manuscript received December 3, 2012; published online May 31, 2013. Assoc. Editor: Timothy J. Jacobs.

J. Energy Resour. Technol 135(4), 042202 (May 31, 2013) (5 pages) Paper No: JERT-12-1059; doi: 10.1115/1.4023549 History: Received March 22, 2012; Revised December 03, 2012

To investigate the effects of fuel temperature on the injection process in the fuel-injection pipe and the combustion characteristics of compression ignition (CI) engine, tests on a four stroke, direct injection dimethyl ether (DME) engine were conducted. Experimental results show that as the fuel temperature increases from 20 to 40 °C, the sound speed is decreased by 12.2%, the peak line pressure at pump and nozzle sides are decreased by 7.2% and 5.6%, respectively. Meanwhile, the injection timing is retarded by 2.2 °CA and the injection duration is extended by 0.8 °CA. Accordingly, the ignition delay and the combustion duration are extended by 0.7 °CA and 4.0 °CA, respectively. The cylinder peak pressure is decreased by 5.4%. As a result, the effective thermal efficiency is decreased, especially for temperature above 40 °C. Before beginning an experiment, the fuel properties of DME, including the density, the bulk modulus, and the sound speed were calculated by “ThermoData.” The calculated result of sound speed is consistent with the experimental results.

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Figures

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Fig. 1

Schematic diagram of the engine test bench

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Fig. 3

DME injection pressures (n = 1870 r· min−1, BMEP = 0.5 MPa)

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Fig. 2

Influence of temperature on DME properties

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Fig. 4

Measured sound speed at speed of 1870 r·min−1

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Fig. 5

Injection delay and duration (n = 1870 r·min−1)

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Fig. 6

Influence of fuel temperature on the cylinder pressure and heat release rate (n = 1870 r·min−1, BMEP = 0.5 MPa)

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Fig. 7

Influence of fuel temperature on τig (n = 1870 r·min−1)

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Fig. 8

Influence of fuel temperature on φtot (n = 1870 r·min−1)

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Fig. 9

Influence of fuel temperature on ηet (n = 1870 r·min−1)

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