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Performance Analysis and Simulation of a Diesel-Miller Cycle (DiMC) Engine

  • Research Article - Mechanical Engineering
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Abstract

A comprehensive performance examination of an engine running on combination of the Diesel and Miller cycles called Diesel-Miller cycle in terms of effective power, density of the effective power, and effective thermal efficiency, which will be called engine performance (ENPER) characteristics, is conducted using a novel thermodynamic simulation model. The impacts of cycle design parameters such as cycle pressure ratio, equivalence ratio, effective compression ratio (r), bore/stroke ratio (d / L), average piston speed, friction coefficient, engine speed (N), stroke (L), and air inlet temperature and air inlet pressure on the ENPER characteristics have been investigated. Additionally, the energy losses depending on exhaust output, friction, incomplete combustion, heat transfer have been defined as a ratio of energy provided by fuel injection. Variable specific heat values with respect to temperature variation for working fluid are used to get realistic results. The results of the study are reasonable and unique, and they could be utilized by researchers and engineers studying on internal combustion engines.

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Abbreviations

A :

Heat transfer area (\(\hbox {m}^{2}\))

\(\hbox {APS}\) :

Average piston speed (m/s)

\({C}_{\mathrm{v}}\) :

Constant volume specific heat (kJ/kg K)

\({C}_{\mathrm{p}}\) :

Constant pressure specific heat (kJ/kg K)

\(\hbox {CPR}\) :

Cycle pressure ratio

\(\hbox {CTR}\) :

Cycle temperature ratio

d :

Bore (m)

d / L :

Bore/stroke ratio

\(\hbox {DiC}\) :

Diesel cycle

\(\hbox {DiMC}\) :

Diesel-Miller cycle

\(\hbox {DuC}\) :

Dual-cycle

\(\hbox {EFE}\) :

Effective thermal efficiency

\(\hbox {EFP}\) :

Effective power (kW)

\(\hbox {EFPD}\) :

Density of the effective power (\(\hbox {kW}/\hbox {m}^{3}\))

\(\hbox {ENPER}\) :

Engine performance

\(\hbox {ER}\) :

Equivalence ratio

\(\hbox {EXO}\) :

Exhaust output

\(\hbox {F}\) :

Fuel/air ratio

\(\hbox {FR}\) :

Friction

\(\hbox {FTTM}\) :

Finite-time thermodynamics modeling

\(\hbox {HTR}\) :

Heat transfer

\({h}_{\mathrm{tr}}\) :

Heat transfer coefficient (W/ \(\hbox {m}^{2}\)K)

\({H}_{\mathrm{\mathrm u}}\) :

Lower heat value of the fuel (kJ/kg)

\(\hbox {INC}\) :

Incomplete combustion

L :

Stroke length (m), energy loss percentage (%)

m :

Mass (kg)

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

Time-dependent mass rate (kg/s)

\(\hbox {MC}\) :

Miller cycle

N :

Engine speed (rpm)

\(\hbox {OMCE}\) :

Otto-Miller cycle engine

P :

Pressure (bar), power (kW)

\(\dot{Q}\) :

Rate of heat transfer (kW)

r :

Effective compression ratio

R :

Gas constant (kJ/kg K)

\(\hbox {RGF}\) :

Residual gas fraction

\(\hbox {SCR}\) :

Selective catalytic reduction

\(\bar{{S}}_{\mathrm{P}}\) :

Average piston speed (m/s)

T :

Temperature (K)

V :

Volume (\(\hbox {m}^{3}\))

\(\alpha \) :

Cycle temperature ratio, atomic number of carbon

\(\beta \) :

Pressure ratio, atomic number of hydrogen

\(\delta \) :

Atomic number of nitrogen

\(\varepsilon \) :

Molar fuel/air ratio

\(\eta _{\mathrm{C}}\) :

Isentropic efficiency of the compression process

\(\eta _{\mathrm{E}}\) :

Isentropic efficiency of the expansion process

\(\eta _{\mathrm{{ef}}}\) :

Effective efficiency

\(\phi \) :

Equivalence ratio

\(\gamma \) :

Atomic number of oxygen

\(\lambda \) :

Cycle pressure ratio

\(\mu \) :

Friction coefficient (Ns/m)

\(\rho \) :

Density (\(\hbox {kg}/\hbox {m}^{3}\))

a:

Air

c:

Combustion, clearance

cyl:

Cylinder

ef:

Effective

exo:

Exhaust output

f:

Fuel

fr:

Friction

htr:

Heat transfer

i:

Initial condition

in:

Input

inc:

Incomplete combustion

mix:

Mixture

out:

Output

rg:

Residual gas

s:

Stroke, isentropic condition

st:

Stoichiometric

t:

Total

w:

Cylinder wall

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Authors and Affiliations

  1. Naval Architecture and Marine Engineering Department, Yildiz Technical University, Besiktas, Istanbul, Turkey

    Guven Gonca

  2. Industrial Engineering Department, Medeniyet University, Kadikoy, Istanbul, Turkey

    Mehmet Fatih Hocaoglu

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  1. Guven Gonca
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Correspondence to Guven Gonca.

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Gonca, G., Hocaoglu, M.F. Performance Analysis and Simulation of a Diesel-Miller Cycle (DiMC) Engine. Arab J Sci Eng 44, 5811–5824 (2019). https://doi.org/10.1007/s13369-019-03747-4

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