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Research Papers

Computer Simulation of Combustion Process in a Piston Engine With a Porous Medium Regenerator

[+] Author and Article Information
Lei Zhou

School of Energy and Power Engineering,
Dalian University of Technology,
Dalian 116024, China
Center for Combustion Energy,
Tsinghua University,
Beijing 100084, China

Maozhao Xie

School of Energy and Power Engineering,
Dalian University of Technology,
Dalian 116024, China
e-mail: xmz@dlut.edu.cn

Ming Jia

School of Energy and Power Engineering,
Dalian University of Technology,
Dalian 116024, China

Junrui Shi

Department of Power Engineering,
Shenyang Institute of Engineering,
Shenyang 110136, China

1Corresponding author.

Manuscript received August 3, 2012; final manuscript received March 5, 2013; published online September 27, 2013. Assoc. Editor: Alexander L. Brown.

J. Thermal Sci. Eng. Appl 5(4), 041004 (Sep 27, 2013) (10 pages) Paper No: TSEA-12-1126; doi: 10.1115/1.4023973 History: Received August 03, 2012; Revised March 05, 2013

In the regenerative engine, effective heat exchange and recurrence between gas and solid can be achieved by the reciprocating movement of a porous medium regenerator in the cylinder, which considerably promotes the fuel-air mixture formation and a homogeneous and stable combustion. A two-dimensional numerical model for the regenerative engine is presented in this study based on a modified version of the engine computational fluid dynamics (CFD) software KIVA-3V. The engine was fueled with methane and a detailed kinetic mechanism was used to describe its oxidation process. The characteristics of combustion and emission of the engine were computed and analyzed under different equivalence ratios and porosities of the regenerator. Comparisons with the prototype engine without the regenerator were conducted. Results show that the regenerative engine has advantages in both combustion efficiency and pollutant emissions over the prototype engine and that using lower equivalence ratios can reduce emissions significantly, while the effect of the porosity is dependent on the equivalence ratio used.

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References

Figures

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Fig. 1

Physical rendering of motion of regenerator and piston in-cylinder by Ferrenberg

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Fig. 2

The motion rules of the PM and piston

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Fig. 3

The computation grids of the PM engine at 155 BTDC

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Fig. 4

The distributions of the gas temperature at different crank angles

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Fig. 5

Temperature distributions in the solid phase of the PM at different crank angles

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Fig. 6

Mass fraction distributions in the cylinder at different crank angles

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Fig. 7

Evolution of average temperature and pressure at ε = 0.83, ϕ = 0.17

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Fig. 8

Variation of heat release rate with porosity at ϕ = 0.17

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Fig. 9

The variation of average gas temperature with porosity at ϕ = 0.17

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Fig. 10

The variation of NOx with different porosity at ϕ = 0.17

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Fig. 11

Comparison of CO, HC, and NOx with different porosity at ϕ = 0.17

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Fig. 12

The variation of solid temperature with different porosity at ϕ = 0.17

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Fig. 13

The variation of average gas temperature with different equivalence ratios at ε = 0.83

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Fig. 14

The variation of NOx with different equivalence ratios at ε = 0.83

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Fig. 15

Gas temperature distribution without PM at ϕ = 0.17

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Fig. 16

The variation of heat release with different equivalence ratios at ε = 0.83

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Fig. 17

The variation of solid temperature with different equivalence ratios at ε = 0.83

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Fig. 18

Comparison of HC and NOx with different equivalence ratios at ε = 0.83

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Fig. 19

The variation of average gas temperature with porosity at equivalent ratio 0.28

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Fig. 20

The variation of NOx with different porosity at equivalent ratio 0.28

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Fig. 21

The variation of average gas temperature with porosity at equivalent ratio 0.5

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Fig. 22

The variation of average gas temperature with porosity at equivalent ratio 0.11

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