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Research Papers: Fuel Combustion

A Proposed Biodiesel Combustion Kinetics Based on the Computational Fluid Dynamics Results in an Ignition Quality Tester

[+] Author and Article Information
Mahmoud Elhalwagy

Department of Mechanical and
Materials Engineering,
Western University,
London, ON N6A 5B9, Canada
e-mail: melhalwa@uwo.ca

Chao Zhang

Mem. ASME Professor
Department of Mechanical and
Materials Engineering,
Western University,
London, ON N6A 5B9, Canada
e-mail: czhang@eng.uwo.ca

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 28, 2018; final manuscript received January 8, 2019; published online February 14, 2019. Assoc. Editor: Stephen A. Ciatti.

J. Energy Resour. Technol 141(8), 082204 (Feb 14, 2019) (13 pages) Paper No: JERT-18-1813; doi: 10.1115/1.4042530 History: Received October 28, 2018; Revised January 08, 2019

In this paper, five biodiesel global combustion decomposition steps are added to a surrogate mechanism to accurately represent the chemical kinetics of the decomposition of different levels of saturation of biodiesel, which are represented by five major fatty acid methyl esters. The reaction constants were tuned based on the results from the numerical simulations of the combustion process in an ignition quality tester (IQT) in order to obtain accurate cetane numbers. The prediction of the complete thermophysical properties of the five constituents is also carried out to accurately represent the physics of the spray and vaporization processes. The results indicated that the combustion behavior is controlled more by the spray and breakup processes for saturated biodiesel constituents than by the chemical delay, which is similar to the diesel fuel combustion behavior. The chemical delay and low temperature reactions were observed to have greater effects on the combustion and ignition delay for the cases of the unsaturated biodiesels. The comparison between the physical ignition delay and overall ignition delay between the saturated and unsaturated biodiesel constituents has also confirmed those stronger effects for the physical delay in the saturated compounds as compared to the unsaturated compounds. The validation of the proposed model is conducted for the simulations of two direct injection diesel engines using palm methyl ester and rape methyl ester.

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Figures

Grahic Jump Location
Fig. 2

Configuration and dimensions of the IQT [24]: (a) Configuration of the IQT test rig and (b) Geometry and dimensions of the combustion chamber

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Fig. 1

Predicted thermophysical properties for biodiesel constituents in comparison to diesel fuel

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Fig. 3

Computational mesh for the IQT simulation

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Fig. 4

Mesh independence test and fuel injection rate

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Fig. 5

Pressure rise of the biodiesel components in the IQT

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Fig. 6

Liquid and vapor penetration for different biodiesel constituents in the IQT

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Fig. 7

Temperature contours of CFD simulations in the IQT

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Fig. 8

Equivalence ratio time variation with temperature for different biodiesel constituents

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Fig. 9

Overall ignition delay and physical-only delay for different biodiesel constituents. Solid lines: with chemistry and dashed lines: without chemistry.

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Fig. 10

Engine sector meshes: (a) light duty engine [42] and (b) Volvo D12C heavy duty engine [21]

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Fig. 11

Pressure-crank angle diagrams, (a) Volvo D12C heavy duty engine and (b) light duty engine

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