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Investigation of thermal stratification effect on n-Heptane/iso-Octane-Air mixture HCCI combustion

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Abstract

The HCCI combustion mode poses its own set of narrow engine operating by knocking. In order to solve this, inhomogeneity method of mixture and temperature is suggested. The purpose of this research is to get fundamental knowledge about the effect of thermal stratification on HCCI combustion of n-Heptane/iso-Octane-Air mixture. The temperature stratification is made by buoyancy effect in combustion chamber of RCM. The analysis items are pressure, temperature of incylinder gas and combustion duration. In addition, the structure of flames using the two dimensional chemiluminescence’s images by a framing camera are analyzed. Under stratification, the LTR starting time and the HTR starting time are advanced than that of homogeneous. Further, the LTR period of homogeneous conditions became shorter than that of the stratified conditions. With the case of homogeneous condition, the luminosity duration becomes shorter than the case of stratified condition. Additionally, under stratified condition, the brightest luminosity intensity is delayed longer than at homogeneous condition.

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Abbreviations

Cp:

specific heat at constant pressure

dP/dt:

rate of pressure rise

dT/dt:

rate of temperature rise

F:

flow volume

I:

luminescence intensity

M:

molecular weight

m:

mass

n:

number of heat

P(t):

pressure

Q:

amount of heat

V(t):

volume

T(t):

mass average temperature

t:

time after compression start

Δt:

time difference

ɛ:

compression ratio

Φ:

equivalence ratio

γ:

mole fraction

κ:

ratio of specific heat

σ:

standard deviation

R:

universal gas constant

T(t):

temperature

ρ:

density

X:

piston position from btc

BTDC:

bottom dead center

HCCI:

homogeneous charge compression ignition

HTR:

high temperature reaction

LTR:

low temperature reaction

TDC:

top dead center

I.I:

image intensifier

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, University of Ulsan, Ulsan, 680-749, Korea

    O. T. Lim

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Lim, O.T. Investigation of thermal stratification effect on n-Heptane/iso-Octane-Air mixture HCCI combustion. Int.J Automot. Technol. 14, 843–855 (2013). https://doi.org/10.1007/s12239-013-0093-0

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  • DOI: https://doi.org/10.1007/s12239-013-0093-0

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