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Experimental investigation on the combustion, performance and emission characteristics of a diesel engine using water emulsified diesel prepared by ultrasonication

  • Pijush Kanti Mondal
  • Bijan Kumar Mandal
Technical Paper
  • 82 Downloads

Abstract

Simultaneous reduction of both nitrogen oxides (NOx) and particulate matter emission from diesel engines can be done using water emulsified diesel (WED) as fuel. Its uses in CI engines also reduce the emissions of other pollutants such as carbon monoxide (CO) and smoke. In this paper, the authors have investigated experimentally the combustion, performance and emission characteristics of a single-cylinder, four-stroke diesel engine using WED prepared by ultrasonication methods containing 10% of water and compared these with those of pure diesel. WED has been produced by high-energy emulsification method using ultrasonicator. The water particle sizes in the emulsion, polydispersity index, stability, density and viscosity of the WED have been measured for the prepared emulsion. The observations show that the ultrasonication may be considered as an acceptable method for emulsification. The combustion characteristics show that the peak in-cylinder pressure and net heat release rate are higher for WED than those of pure diesel. Longer ignition delay is found for WED than that of neat diesel. However, the combustion duration is shorter. On the other hand, pure diesel and WED are comparable with respect to power, brake thermal efficiency (BTE) and brake-specific fuel consumption (BSFC). At higher load, increased BTE and decreased neat BSFC were found in case of WED. Emissions of pollutants like NOx and smoke reduce significantly, whereas HC emission increases. No significant difference is observed in CO emission at full-load condition between pure diesel and WED.

Keywords

Water emulsified diesel Ultrasonication Combustion characteristics Engine performance Emission characteristics 

Abbreviations

WED

Water emulsified diesel

NOx

Nitrogen oxides

PM

Particulate matter

HC

Hydrocarbon

CO

Carbon monoxide

BTE

Brake thermal efficiency

BSFC

Brake-specific fuel consumption

CO2

Carbon dioxide

SOx

Oxides of sulfur

COP21

Conference of the Paris, twenty-first session

CNG

Compressed natural gas

CI

Compression ignition

%

Percentage

BDC

Bottom dead center

HSU

Hartridge smoke unit

µm

Micrometer

EDAS

Electronic data acquisition system

IMEP

Indicated mean effective pressure

BMEP

Brake mean effective pressure

PDI

Polydispersity index

RPM

Revolution per minute

DLS

Dynamic light scattering

ES

Emulsion stability

VT

Volume of emulsion phase before predetermined time

VE

Volume of emulsion phase after predetermined time

ASTM

American Society for Testing and Materials

DI

Direct injection

LSW

Lifshitz–Slyozov and Wagner theory

BTDC

Before top dead center

HLB

Hydrophile–lipophile balance

Notes

Acknowledgements

The authors acknowledge Higher Education Department, MHRD, Government of India, for the financial support under TEQIP-II for procuring the necessary equipment for carrying out this work.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNazrul Centenary PolytechnicRupnarayanpur, Paschim BardhamanIndia
  2. 2.Department of Mechanical EngineeringIndian Institute of Engineering Science and TechnologyShibpur, HowrahIndia

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