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Different camshaft profile analyses for natural gas engine performance and emission

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Abstract

Recently, the environmental crisis and the negative influence of gasoline and diesel fuels on it, together with these fuels high cost persuaded manufacturing companies to use natural gas as substitute fuel. Considering the same volumetric efficiency and fuel penetration, natural gas needs more space because of its much lower density in comparison to liquid fuels. In this regard, the Miller cycle as the fifth-thermodynamic cycle in internal combustion engines is discussed. Increasing the expansion ratio along with the compression by changing in the intake valve closure is the main characteristic of this cycle. In this study, AVL FIRE software is used to simulate D87 gas engine. Since the close cycle cannot examine valve lifting effectively as well as turbo charging, one-dimensional simulation by GT Power software is used. After their parallelism with each other, four camshaft timing was used as well as Otto cycle. Results show that there is a reduction in the maximum pressure and temperature with slight increment in power. Also due to decrease in peak temperature, NOx diminishes obviously.

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Abbreviations

CFD:

Computational fluid dynamic

BSFC:

Brake specific fuel consumption

EIVC:

Early intake valve closure

SI:

Spark ignition

IVC:

Intake valve closing

EVC:

Exhaust valve closure

BDC:

Bottom dead center

ABDC:

After bottom dead center

K:

Kelvin

P:

Pressure

BMEP:

Brake mean effective pressure

IVC:

Intake valve closure

LIVC:

Late intake valve closure

IVO:

Exhaust valve closure

EVO:

Exhaust valve opening

TDC:

Top dead center

BTDC:

Before top dead center

CR:

Compression ratio

VE:

Volumetric efficiency

T:

Temperature

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Authors and Affiliations

  1. Department of Mechanical Engineering, Babol University of Technology, Babol, Iran

    S. Tavakoli, D. Domiri Ganji & M. Gorji

  2. Department of Flow, Heat and Combustion Mechanic, Ghent University, Ghent, Belgium

    A. Rasekh

  3. Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran

    S. Naeejee

Authors
  1. S. Tavakoli
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  2. D. Domiri Ganji
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  3. M. Gorji
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  4. A. Rasekh
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  5. S. Naeejee
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Corresponding author

Correspondence to D. Domiri Ganji.

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Technical Editor: Luis Fernando Figueira da Silva.

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Tavakoli, S., Domiri Ganji, D., Gorji, M. et al. Different camshaft profile analyses for natural gas engine performance and emission. J Braz. Soc. Mech. Sci. Eng. 38, 355–364 (2016). https://doi.org/10.1007/s40430-015-0317-5

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  • DOI: https://doi.org/10.1007/s40430-015-0317-5

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