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Research Papers: Internal Combustion Engines

Gas-to-Liquid Sprays at Different Injection and Ambient Conditions

[+] Author and Article Information
Dung Ngoc Nguyen1

Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japandungnn2@gmail.com

Hiroaki Ishida, Masahiro Shioji

Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan

1

Corresponding author.

J. Eng. Gas Turbines Power 133(3), 032804 (Nov 09, 2010) (10 pages) doi:10.1115/1.4001769 History: Received August 13, 2009; Revised March 07, 2010; Published November 09, 2010; Online November 09, 2010

Alternative fuels exhibit potential as a clean fuel and suitable to address problems of energy security and environmental pollution. The main objective of this research was to provide the fundamental data of ignition delay and combustion characteristics for gas-to-liquid (GTL) fuels. Experiments were carried out in a constant-volume vessel under diesel-engine conditions to study the effects of various injection and ambient conditions on ignition and combustion characteristics. The results showed that all tested fuels exhibited similar ignition-delay trends: Ignition delay increased as ambient temperature, ambient pressure, and oxygen concentration decreased. The result of changing injection pressures and nozzle-hole diameters did not significantly affect ignition-delay values for all tested fuels. The variation in ignition-delay values was small at temperatures higher than 700 K but large at temperatures less than 700 K. In addition, the result showed that GTL fuels with high cetane number corresponded to shorter ignition delay and smoother heat-release rate than those for gas-oil (conventional diesel fuel) at the same temperature, pressure, and oxygen concentration. The blend GTL fuel improved ignition quality and combustion than that of gas-oil. Shadowgraph images showed that GTL fuels exhibited shorter spray penetration and mixed with the hot air quicker than gas-oil. In addition, GTL fuels showed suitability for premixed charge compression-ignition operations owing to ignitability at low temperature. The obtained results provide useful information for finding the optimal conditions for the design and control of diesel engines fuelled by synthetic GTL fuels.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cross section of the constant-volume combustion vessel

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Figure 2

Definition of ignition delay

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Figure 3

Spray penetration of GTL B and gas-oil with different injection pressures. Chamber pressure and temperature are 4 MPa and 298 K, respectively.

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Figure 4

Effects of pj on ignition delay for GTL A, GTL B, and gas-oil

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Figure 5

Effects of pj on dq/dt for GTL A, GTL B, and gas-oil

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Figure 6

Reactive sprays penetration of GTL B and gas-oil with different injection pressures. Chamber pressure and temperature are 4 MPa and 750 K, respectively.

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Figure 7

Shadowgraph images effects of pj on ignition delay and combustion characteristics for GTL B and gas-oil. Chamber pressure and temperature are 4 MPa and 750 K, respectively.

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Figure 8

Effects of dN on ignition delay for GTL A and gas-oil

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Figure 9

Effects of dN on dq/dt for GTL A and gas-oil

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Figure 10

Effects of rO2 on ignition delay for GTL A, GTL B, BGTL, and gas-oil at pi=4 MPa

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Figure 11

Effects of rO2 on dq/dt for GTL A, GTL B, BGTL, and gas-oil at pi=4 MPa

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Figure 12

Shadowgraph images effects of rO2 on ignition delay and combustion characteristics for GTL B and gas-oil. Chamber pressure and temperature are 4 MPa and 750 K, respectively.

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Figure 13

Effects of rO2 on ignition delay for GTL A, GTL B, BGTL, and gas-oil at pi=2 MPa

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Figure 14

Effects of rO2 on dq/dt for GTL A, GTL B, BGTL, and gas-oil at pi=2 MPa

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Figure 15

Igniton delay for GTL A and gas-oil at pi=2 MPa, rO2=21%

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