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Reactivity-controlled compression ignition (RCCI) with double direct injection of diesel and hydrous ethanol

  • Claudio Vidal TeixeiraEmail author
  • Carlos Valois Maciel Braga
  • Fernando Zegarra Sánchez
  • Sergio Leal Braga
Technical Paper
  • 30 Downloads

Abstract

Oil is still a relevant component in the global energy matrix. However, price fluctuations, irregular production and possible shortage of oil are factors that negatively affect the world economy. Moreover, it is universal unanimity that the exploitation of oil and its derivatives causes setbacks to the environment and diminishes the population life quality. Therefore, there are studies to find natural energy sources to replace petroleum products to reduce the harmful effects caused by fossil fuels. In this work, sugarcane ethanol, widely used to supply passenger cars in Brazil, was the fuel chosen as a possible candidate for diesel replacement, even partially. To conduct the study, a reactive charge compression ignition engine fueled with diesel and ethanol was used to compare two directed injection modes: ethanol and diesel (ED) strategy (ethanol and diesel injected before top dead center (TDC)) and diesel and ethanol (DE) strategy (diesel injected before TDC and ethanol injected after TDC). In all tests in which ethanol was injected, increased ignition delay was observed. The highest efficiency was achieved using the ED injection strategy, but detonations and pressure peaks appeared. Test results also show that, using DE injection strategy, it was possible to increase the amount of ethanol injected, since no pressure peaks nor detonations appeared; however, it presented lower efficiency compared to the ED injection strategy.

Keywords

Hydrous ethanol Diesel oil Compression ignition RCCI 

Abbreviations

AGR

Rio de Janeiro War Armory

CAPES

Higher education personnel improvement coordination

CECD

Diesel-specific consumption

CI

Compression ignition

CH4

Methane

CN

Cetane number

CNG

Compressed natural gas

CO

Carbon monoxide

CR

Compression ratio

CTEx

Army Technology Center

DE

Diesel/ethanol

DEM

Mechanical Engineering Department

DF

Manufacturing directorate

DI

Directly injected

DIS

Diesel injection system

DMF

2,5-Dimethylfuran

EB

Brazilian Army

ED

Ethanol/diesel

EGR

Exhaust gas recirculation

EIS

Ethanol injection system

ED95

Ethanol additive

HC

Hydrocarbon

HCCI

Homogeneous charge compression ignition

ID

Ignition delay

IME

Military Engineering Institute

ITUC

PUC-RJ Institute of Technology

LEV

Vehicle Engineering Laboratory

LTC

Low-temperature combustion

MCR

Rapid compression machine

NO2

Nitrogen dioxide

NOx

Generically represents nitric oxide (NO) and nitrogen dioxide (NO2), products of the combustion process

PCCI

Premixed charge compression ignition

PFI

Port fuel injection

PM

Particulate material

PUC-RJ

Pontifical Catholic University of Rio de Janeiro

RCCI

Reactivity-controlled compression ignition

TDC

Top dead center

ULSD

Ultra-low-sulfur diesel

Notes

Acknowledgements

We would like to thank the Pontifical Catholic University of Rio de Janeiro (PUC-RJ), engineer team of Vehicular Engineering Laboratory (LEV—PUC-Rio), Department of Mechanical Engineering of PUC-RJ (DEM), Institute of Technology of PUC-RJ (ITUC), Brazilian Army, Military Institute of Engineering (IME), Army Technology Center (CTEx), Rio de Janeiro War Armory (AGR), the Manufacturing Directorate (DF) and Personnel Improvement Coordination Higher Education (CAPES). The authors certify that they have NO affiliation with or involvement in any organization or entity with any financial interest (such as honoraria, educational grants, participation in speakers’ bureaus, membership, employment, consultancies, stock ownership, or other equity interest, and expert testimony or patent-licensing arrangements) or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in the manuscript.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  • Claudio Vidal Teixeira
    • 1
    Email author
  • Carlos Valois Maciel Braga
    • 1
  • Fernando Zegarra Sánchez
    • 1
  • Sergio Leal Braga
    • 1
  1. 1.Departamento de Engenharia Mecânica (DEM)Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio)Rio de JaneiroBrazil

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