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The multi-zone model of the low heat rejection engine for DI diesel injection engines

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Journal of the Brazilian Society of Mechanical Sciences and Engineering Aims and scope Submit manuscript

Abstract

To effectively use fuel energy in internal combustion engines, the concept of Low Heat Rejection Engine (LHRE) has been developed over the past four decades. This concept that LHRE can increase an engine power output and efficiency has enabled further accomplishment of a broad array of research topics in this field. In this work, the various processes of the LHRE DI diesel engine were simulated with a developed multi-zone quasi-dimensional model and the results were compared with those derived from the base DI conventional engine. In the multi-zone model, the engine combustion chamber after fuel injection is divided in two zones: air zone and spray zone. After break up time, spray zone also divides into an axial direction and across it in radial direction. The governing equations that include mass, energy and simplified momentum equations were solved for each zone to obtain the pressure, temperature, equivalence ratio, and properties of the combustion products. In this study, the multi-zone two-dimensional model was developed to model insulated engine and also to predict the enhancement of the engine power.

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Abbreviations

r :

Zonal radius (m)

A :

Surface (m2)

\(k\) :

Thermal conductivity (W/mK)

\(h\) :

Convection heat transfer coefficient

\(T\) :

Temperature (K)

\(\dot{Q}\) :

Heat transfer rate

R :

Resistance

\(q_{{{\text{h}}_{\text{z}} }}\) :

Convectional heat transfer

\(t\) :

Time (s)

\(\dot{m}\) :

Fuel injection rate (kg/deg)

\(\rho\) :

Density (kg/m3)

\(l\) :

Length (m)

\(D\) :

Injector nozzle hole diameter (m)

\(\alpha\) :

Constant

m :

Mass

\(\varphi\) :

Crank angle (°CA)

x :

Cartesian coordinate (m)

y :

Cartesian coordinate (m)

sf:

Soot formation

m:

Mean

r:

Ring

c:

Ceramic coating

w0:

Initial wall

w:

Wall

g:

Cylinder bulk gas

so:

Soot oxidation

l:

Liner

s:

Swirl

t:

Thermal

p:

Piston

a:

Air

ev:

Evaporated

z:

Zone

ox:

Oxidation

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Authors and Affiliations

  1. Mechatronics Engineering Program, Sabanci University, Orhanli, Tuzla, Istanbul, 34956, Turkey

    Morteza Ghorbani

  2. Department of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran

    Sasan Akbarpour

Authors
  1. Morteza Ghorbani
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  2. Sasan Akbarpour
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Correspondence to Morteza Ghorbani.

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Technical Editor: Luis Fernando Figueira da Silva.

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Ghorbani, M., Akbarpour, S. The multi-zone model of the low heat rejection engine for DI diesel injection engines. J Braz. Soc. Mech. Sci. Eng. 38, 365–375 (2016). https://doi.org/10.1007/s40430-015-0336-2

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  • DOI: https://doi.org/10.1007/s40430-015-0336-2

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