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A Study on Late Intake Valve Closing Miller Cycled Diesel Engine

  • Research Article - Special Issue - Mechanical Engineering
  • Published:
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Abstract

NO x emissions released from diesel engines have much detrimental effects on the environment. Hence, these emissions must be decreased to the limited values described by regulations. One of the effective methods is to adopt Miller cycle to diesel engine in order to improve the performance and to reduce NO x emissions of a diesel engine. In this study, late inlet valve closing Miller cycle is applied to diesel engine by lowering compression ratio with respect to expansion ratio by closing intake valve 10 and 20 crank angles later than that of standard diesel engine by using zero-dimensional single zone model which was verified with experimental data. The obtained results have been compared with standard diesel engine in terms of performance and NO emissions. The results showed that Miller cycled diesel engine is found more efficient and environmentally friendly with less power output than standard diesel engine.

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Abbreviations

A :

Heat transfer area (cm2)

c p :

Constant pressure specific heat (J/g K)

C :

Blowby coefficient

B :

Bore (cm)

F :

Fuel–air ratio

h :

Specific enthalpy (J/g)

h tr :

Heat transfer coefficient (W/m2/K)

H u :

Lower heating value (J/g)

Δh :

Combustion enthalpy of fuel (J)

m :

Mass (g)

\({\dot{m}}\) :

Time-dependent mass rate (g/s)

M :

Molecular weight (g)

n :

Injection constant

p :

Pressure (bar)

P :

Power (kW)

N :

Revolution per minute

Q :

Loss heat passed through the cylinder wall (J)

\({\dot{Q}}\) :

Rate of heat transfer (W)

RGF:

Residual gas fraction

S :

Stroke (cm)

\({\bar{S}_{\rm p}}\) :

Mean piston velocity (m/s)

T :

Temperature (K)

U :

Internal energy (J)

v :

Specific volume (cm3/g)

V :

Volume (cm3)

W :

Work output (J)

\({\dot{x}_{\rm i}}\) :

Fraction rate of the total injected fuel mass

\({\dot{x}_{\rm b}}\) :

Fraction rate of the total burned fuel mass

\({\varepsilon}\) :

Ratio of half stroke to rod length

\({\phi}\) :

Equivalence ratio

Γ (n):

Gama function depending on n

θ :

Crank angle (\({\circ}\))

τ :

Time (ms)

ω :

Angular velocity (rad/s)

η :

Thermal efficiency

1:

At the beginning of the compression

a:

Air

b:

Burning

cyl:

Cylinder

di:

Injection duration parameter

db:

Burning duration parameter

e:

Effective

f:

Fuel

fi:

Injected fuel

fb:

Burned fuel

I:

Injection, indicated

id:

Ignition delay

l:

Loss

s:

Stroke

si:

Start of fuel injection

sb:

Start of burning

st:

Stoichiometric

tfmep:

Total friction mean effective pressure

w:

Cylinder walls

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Correspondence to Yasin Ust.

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Gonca, G., Sahin, B., Ust, Y. et al. A Study on Late Intake Valve Closing Miller Cycled Diesel Engine. Arab J Sci Eng 38, 383–393 (2013). https://doi.org/10.1007/s13369-012-0437-5

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  • DOI: https://doi.org/10.1007/s13369-012-0437-5

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