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Evaluation of the Efficiency of a Double Spark Plug to Improve the Performances of Combustion Engines: Pressure Measurement and Plasma Investigations

  • D. Astanei
  • F. Faubert
  • S. PellerinEmail author
  • B. Hnatiuc
  • M. Wartel
Original Paper
  • 22 Downloads

Abstract

The ignition sparks provided by the conventional spark plug (CSP) do not always ensure a fast and complete combustion of the hydrocarbon–air mixture. For this reason, we offer a new type of spark plug with two simultaneous discharges generated by a pulsed high voltage–power supply. First, we present results concerning geometrical and electrical characteristics of plasmas produced in air and in engine combustion chamber. A more important volume of plasma is highlighted. The larger surface of interaction of plasma with the air-to-fuel mixture promotes the initiation of a greater number of chemical reactions thus increases the rate of propagation of the combustion. In addition, for long pulse durations the energy delivered by the double spark plug (DSP) to the discharge is 20% higher, as compared to a CSP. The current rise rate is more important for the DSP, which allows better ionization of the mixture. Afterwards, we present a study of two four-strokes engines ignited by this DSP, one powered with gasoline and the second one with propane. The pressure into the cylinder, measured as a function of the crankshaft angle, allowed to compute the IMEP, COVIMEP, and PPP, for both tested engines. In the case of the gasoline engine, when the ignition and flame development conditions are difficult—a high ignition angle was considered—the DSP can offer an almost 3.5 times better operation stability (considering the coefficient of variation of the indicated mean effective pressure as main indicator) and a faster development of the combustion flame (defined by the means of the pressure peak position). A study was also performed as a function of the equivalence ratio for the propane-powered engine, which confirmed the results regarding the DSP performances obtained with the first engine. In addition, this study highlighted that for very lean mixtures, the DSP can provide a better stability in operation (COVIMEP, COVPPP) is assured even for equivalence ratios in the range of 0.65, where the use of CSPs involves misfires and very high engine vibrations.

Keywords

Double spark plug SI engines Lean mixtures Combustion Plasma 

List of Symbols

BDC

Bottom Dead Center (lower limit of piston motion)

CAD

Crank Angle Degree

CAD ATDC

Crank Angle Degree After Top Dead Center

COVIMEP

Coefficient Of Variation of IMEP

COVPPP

Coefficient Of Variation of PPP

COVspeed

Coefficient Of Variation of engine speed

CSP

Conventional Spark Plug

DOI

Duration Of Injection

DSP

Double Spark Plug

EGR

Exhaust Gas Recirculation

HV

High Voltage

ICE

Internal Combustion Engine

IMEP

Indicated Mean Effective Pressure

MBF

Mass Burned Fraction

P

In-cylinder Pressure

Pi

Indicated power

Pmax

Maximum Pressure

PPP

Pressure Peak Position

rpm

Revolutions Per Minute

SI

Spark Ignition

TDC

Top Dead Center (upper limit of piston motion)

Ti

Indicated Torque

TTL

Transistor–Transistor Logic

Ub

Breakdown voltage

Vd

Displaced Volume in the cylinder

Φ

Equivalence ratio

Notes

Acknowledgement

This work was a part of an international cotutelle agreement between “Gheorghe Asachi” Technical University of Iasi, Romania and Orléans University, France and financially supported by AUF (Agence Universitaire de la Francophonie). Part of this work was realized with the support of COMPETE project nr. 9PFE/2018, financed by the Romanian Government. The authors would like thank Prof. Fabrice Foucher and Dr. Antonio Mariani, for giving the opportunity to test the proposed ignition system on engine bench in the PRISME Laboratory—Polytech Orleans.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • D. Astanei
    • 1
    • 2
  • F. Faubert
    • 2
  • S. Pellerin
    • 2
    Email author
  • B. Hnatiuc
    • 3
  • M. Wartel
    • 2
  1. 1.Faculty of Electrical Engineering“Gheorghe Asachi” Technical University of IasiIasiRomania
  2. 2.GREMI, UMR7344Université d’Orléans/CNRSBourgesFrance
  3. 3.Department of Electrical EngineeringConstanta Maritime UniversityConstanţaRomania

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