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Research Papers: Fuel Combustion

Influence of Key Structural Parameters of Combustion Chamber on the Performance of Diesel Engine

[+] Author and Article Information
Xinhai Li, Shaobo Ji, Xin Lan

School of Energy and Power Engineering,
Shandong University,
Jinan 250061, China

Yong Cheng

School of Energy and Power Engineering,
Shandong University,
Jinan 250061, China
e-mail: cysgd@sdu.edu.cn

1Corresponding author.

Contributed by the Internal Combustion Engine Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 8, 2016; final manuscript received February 12, 2017; published online March 8, 2017. Assoc. Editor: Stephen A. Ciatti.

J. Energy Resour. Technol 139(4), 042203 (Mar 08, 2017) (7 pages) Paper No: JERT-16-1399; doi: 10.1115/1.4036049 History: Received October 08, 2016; Revised February 12, 2017

The structural parameters of combustion chamber have great impacts on the process of air–fuel mixing, combustion, and emissions of diesel engine. The dynamic characteristics and emission performances could be improved by means of optimizing the parameters of the combustion chamber. In this paper, the key structure of a diesel engine combustion chamber is parameterized, and the influence of individual structural parameter on dynamic characteristics and emissions of the engine is simulated and analyzed by computational fluid dynamics (CFD) software avl-fire. The results show that under constant compression ratio, the in-cylinder peak pressure decreases with increasing inclination angle of the combustion chamber (α), while the height (Tm) and bowl radius (R) have little influence on the in-cylinder peak pressure. With increasing α, NO emissions decrease, and soot emissions first increase and then decrease. With increasing R, both NO and soot emissions decrease first and then increase. Therefore, the combustion chamber parameters could be optimized by comprehensive consideration of cylinder pressure, NO and soot emissions.

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Figures

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Fig. 1

Definition of parameter

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Fig. 2

Simulation mesh model

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Fig. 4

The effect of angle α on diesel performance: (a) comparison of cylinder pressure under different α, (b) variations of the change of NO emission under different α, and (c) comparison of soot emissions under different α

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Fig. 5

Comparison of the velocity field and mass fraction of fuel under different α at 740 deg CA

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Fig. 6

Comparison of heat release rate under different α

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Fig. 7

The influence of piston bowl radius R on diesel engine performance: (a) comparisons of cylinder pressure under different R, (b) variations of the change of NO emission under different R, and (c) comparison of soot emission under different R

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Fig. 8

Velocity field and fuel mass fraction field under different R at 740 deg CA

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Fig. 9

Heat release rates under different R

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Fig. 10

Diesel dynamic and emission performance under different Tm: (a) comparisons of cylinder pressure under different Tm, (b) variations of NO emission under different Tm, and (c) comparison of soot emission under different Tm

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Fig. 11

Comparison of velocity field and fuel mass fraction under different Tm at 740 deg CA

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