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Emission and performance analysis of DI diesel engines fueled by biodiesel blends via CFD simulation of spray combustion and different spray breakup models: a numerical study

  • Abbas Zarenezhad AshkezariEmail author
  • Kambiz Divsalar
  • Rahim Malmir
  • Iman Abbaspour
Article
  • 14 Downloads

Abstract

In the current study, computational fluid dynamics code was used to perform 3D simulation of mixture formation and combustion of biodiesel fuel spray in a direct injection diesel engine. Thus, the spray atomization and combustion processes were simulated by applying the improved version of KH–RT spray breakup model coupled with advanced ECFM-3Z model for combustion. To this aim, experimental results were used first to validate the calculated values of NOx, soot, heat release rate, and in-cylinder pressure and good agreement was obtained. To develop the engine performance and reduce the emission, various models of spray breakup of biodiesel fuel were simulated, and the optimum spray breakup model was specified. Also, the accuracy of each model was determined in comparison with the experimental results. The results show that the TAB breakup model has not provided acceptable results for spray characteristics compared to the other models. Since the simulation results of in-cylinder pressure and emissions were consistent with the experimental results by the KHRT model, it could be concluded that this model has correctly predicted the size of droplets produced by spray fragmentation and penetration, and it could be used to simulate the atomization of biodiesel fuel spray under different engine conditions by adjusting the model constants.

Keywords

Spray Breakup Biodiesel Combustion Diesel engine CFD 

Abbreviations

DI

Direct injection

HD

Heavy duty

NOx

Nitrogen oxides

CO

Carbon monoxide

HC

Hydrocarbon

BSFC

Brake-specific fuel consumption

IVC

Inlet valve closing

IVO

Inlet valve opening

EVO

Exhaust valve opening

CA

Crank angle

TDC

Top dead center

BDC

Bottom dead center

aBDC

After bottom dead center

bBDC

Before bottom dead center

aTDC

After top dead center

bTDC

Before top dead center

CI

Heat release rate

SI

Spark ignition

AFR

Air/fuel ratio

CFD

Computational fluid dynamics

HRR

Compression ignition

BTE

Brake thermal efficiency

RPM

Revolution per minute

MB

Methyl butanoate

DDM

Discrete droplet method

LLNL

Lawrence Livermore National Laboratory

KHRT

Kelvin–Helmholtz and Rayleigh–Taylor

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringImam Khomeini Maritime University of NowshahrNowshahrIran
  2. 2.Department of Mechanical EngineeringBabol Noshirvani University of TechnologyBabolIran
  3. 3.Department of Mechanical EngineeringIslamic Azad University Sari BranchSariIran

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