Research Papers: Internal Combustion Engines

A Detailed Study of the Effects of Biodiesel Addition and Exhaust Gas Recirculation on Diesel Engine PCCI Combustion, Performance and Emission Characteristics by KIVA–CHEMKIN Coupling

[+] Author and Article Information
Alborz Zehni

Department of Mechanical Engineering,
University of Sahand,
Sahand New Town 51335-1996, Iran
e-mail: A_Zehni@sut.ac.ir

Rahim Khoshbakhti Saray

Department of Mechanical Engineering,
University of Sahand,
Sahand New Town 51335-1996, Iran
e-mail: Khoshbakhti@sut.ac.ir

Elahe Neshat

Department of Mechanical Engineering,
University of Sahand,
Sahand New Town 51335-1996, Iran
e-mail: E_Neshat@sut.ac.ir

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 28, 2016; final manuscript received August 28, 2017; published online January 17, 2018. Assoc. Editor: Timothy J. Jacobs.

J. Eng. Gas Turbines Power 140(6), 062801 (Jan 17, 2018) (14 pages) Paper No: GTP-16-1550; doi: 10.1115/1.4038456 History: Received November 28, 2016; Revised August 28, 2017

In this study, a numerical study is performed by KIVA–CHEMKIN code to investigate the effects of biodiesel addition and exhaust gas recirculation (EGR) on diesel engine premixed charge compression ignition (PCCI) combustion, performance, and emission characteristics. The studies are performed for neat diesel fuel and mixture of 10–40% biodiesel addition at 67%, 50%, and 40% EGR. For this purpose, a multichemistry surrogate mechanism using methyl decanoate (MD) and methyl-9-decenoate (MD9D) is used. The main innovation of this work is analyzing the chemical, thermodynamic, and dilution effects of biodiesel addition as well as different EGR ratios on PCCI combustion behavior. The results show that the main effect of EGR on PCCI combustion of biodiesel blend is related to the high temperature heat release (HTHR), and its effect on low temperature heat release (LTHR) is low. With increasing biodiesel addition, the role of the chemical effect is increased compared to the thermodynamic and dilution effects. Rate of production analysis (ROPA) indicate that for the different biodiesel ratios, the effect of reaction nC7H16 + HO2 = C7H15-2 + H2O2 is more effective on the start of combustion (SOC) compared to the other reactions. For a defined biodiesel addition, with decreasing EGR, total (unburned) hydrocarbon (THC) and CO are decreased, while NOx and indicated specific fuel consumption (ISFC) are increased.

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Fig. 1

Schematic diagram for coupling between KIVA code and CHEMKIN chemistry solver

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Fig. 2

Evolution of the main thermophysical properties of methyl oleate, methyl palmitate, and tetradecane versus temperature [22,24]

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Fig. 3

Computational mesh and spray trajectory of the GM 1.9 L engine geometry at two different views

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Fig. 4

Mesh independency based on the in-cylinder pressure history, SOI: −30 CAD ATDC, EGR: 67%

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Fig. 5

Comparison of the measured and predicted in-cylinder pressure and HRR histories for the cases 1–6

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Fig. 6

Comparison of the measured and predicted exhaust NOx, CO, THC, and ISFC for the cases 1–6

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Fig. 7

HRR and CHR histories for various biodiesel blends

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Fig. 8

In-cylinder pressure and temperature histories for various biodiesel blends at different EGR percentages

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Fig. 9

In-cylinder temperature contour plots for the case 1 at two different cut-planes at TDC: (a) B0, (b) B10, (c) B20, (d) B30, and (e) B40

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Fig. 10

SOC and combustion duration for various biodiesel blends at different EGR percentages

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Fig. 11

The chemical, thermodynamic, and dilution effects of various biodiesel blends on SOC

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Fig. 12

Spray injection and cut plane of in-cylinder formaldehyde (CH2O), hydroxyl (OH), and temperature contour plots at various crank angle degrees for B10 and B40 cases, 67% EGR, SOI: −30 CAD ATDC

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Fig. 13

The NROPA for n-heptane oxidation at SOC for different biodiesel blends, 67% EGR

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Fig. 14

Exhaust THC, CO, and NOx emissions as well as ISFC for various biodiesel blends at different EGR percentages

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Fig. 15

Indicated power versus various biodiesel blends at different EGR percentages




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