View in EDS

Effects of large-scale turbulence on cyclic variability in spark-ignition engine

Saved in:
Bibliographic Details
Title: Effects of large-scale turbulence on cyclic variability in spark-ignition engine
Authors: Burluka, A.A. A.A.Burluka@leeds.ac.uk, El-Dein Hussin, A.M.T.A., Ling, Z.-Y.1, Sheppard, C.G.W.1
Source: Experimental Thermal & Fluid Science. Nov2012, Vol. 43, p13-22. 10p.
Subjects: Turbulence, Spark ignition engine ignition, Otto cycle, Combustion chambers, Root-mean-squares, Vortex motion, Particle image velocimetry
Abstract: Abstract: An investigation is carried out into the connection between the various characteristics of the velocity field and the burning rate in a spark-ignition engine. The experiments are performed on the Leeds University Ported Optical Engine with a large skip-firing ratio; the engine allows a full optical access to the combustion chamber. Velocity fields are obtained using a Particle Image Velocimetry (PIV) and a systematic distinct averaging is performed with an account of the cyclic variability of the burning rate, that is the properties of the turbulent velocity fields are derived separately for the fast, middle and slow cycles using the peak pressure as a proxy measure for the burning rate. Even though the velocity fields are nearly homogeneous in the mean, they reveal very significant intermittency where the regions of intense fluctuations have an extent more than half the clearance height. It is shown that the variations of the burning rate are correlated with the fluctuations in root-mean-square fields of the velocity magnitude, vorticity and shear strain rate. Faster combustion is induced by the fields with larger root-mean-square values. No discernible correlation of the burning rate with the average vorticity or shear strain fields has been detected. The integral scales of the large-scale motion derived from the PIV do not show any systematic variation between fast and slow cycles. [Copyright &y& Elsevier]
Copyright of Experimental Thermal & Fluid Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 79653705
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Effects of large-scale turbulence on cyclic variability in spark-ignition engine
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Burluka%2C+A%2EA%2E%22">Burluka, A.A.</searchLink><i> A.A.Burluka@leeds.ac.uk</i><br /><searchLink fieldCode="AR" term="%22El-Dein+Hussin%2C+A%2EM%2ET%2EA%2E%22">El-Dein Hussin, A.M.T.A.</searchLink><br /><searchLink fieldCode="AR" term="%22Ling%2C+Z%2E-Y%2E%22">Ling, Z.-Y.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sheppard%2C+C%2EG%2EW%2E%22">Sheppard, C.G.W.</searchLink><relatesTo>1</relatesTo>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Experimental+Thermal+%26+Fluid+Science%22">Experimental Thermal & Fluid Science</searchLink>. Nov2012, Vol. 43, p13-22. 10p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink><br /><searchLink fieldCode="DE" term="%22Spark+ignition+engine+ignition%22">Spark ignition engine ignition</searchLink><br /><searchLink fieldCode="DE" term="%22Otto+cycle%22">Otto cycle</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion+chambers%22">Combustion chambers</searchLink><br /><searchLink fieldCode="DE" term="%22Root-mean-squares%22">Root-mean-squares</searchLink><br /><searchLink fieldCode="DE" term="%22Vortex+motion%22">Vortex motion</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+image+velocimetry%22">Particle image velocimetry</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: An investigation is carried out into the connection between the various characteristics of the velocity field and the burning rate in a spark-ignition engine. The experiments are performed on the Leeds University Ported Optical Engine with a large skip-firing ratio; the engine allows a full optical access to the combustion chamber. Velocity fields are obtained using a Particle Image Velocimetry (PIV) and a systematic distinct averaging is performed with an account of the cyclic variability of the burning rate, that is the properties of the turbulent velocity fields are derived separately for the fast, middle and slow cycles using the peak pressure as a proxy measure for the burning rate. Even though the velocity fields are nearly homogeneous in the mean, they reveal very significant intermittency where the regions of intense fluctuations have an extent more than half the clearance height. It is shown that the variations of the burning rate are correlated with the fluctuations in root-mean-square fields of the velocity magnitude, vorticity and shear strain rate. Faster combustion is induced by the fields with larger root-mean-square values. No discernible correlation of the burning rate with the average vorticity or shear strain fields has been detected. The integral scales of the large-scale motion derived from the PIV do not show any systematic variation between fast and slow cycles. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Experimental Thermal & Fluid Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=79653705
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.expthermflusci.2012.04.012
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 13
    Subjects:
      – SubjectFull: Turbulence
        Type: general
      – SubjectFull: Spark ignition engine ignition
        Type: general
      – SubjectFull: Otto cycle
        Type: general
      – SubjectFull: Combustion chambers
        Type: general
      – SubjectFull: Root-mean-squares
        Type: general
      – SubjectFull: Vortex motion
        Type: general
      – SubjectFull: Particle image velocimetry
        Type: general
    Titles:
      – TitleFull: Effects of large-scale turbulence on cyclic variability in spark-ignition engine
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Burluka, A.A.
      – PersonEntity:
          Name:
            NameFull: El-Dein Hussin, A.M.T.A.
      – PersonEntity:
          Name:
            NameFull: Ling, Z.-Y.
      – PersonEntity:
          Name:
            NameFull: Sheppard, C.G.W.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 11
              Text: Nov2012
              Type: published
              Y: 2012
          Identifiers:
            – Type: issn-print
              Value: 08941777
          Numbering:
            – Type: volume
              Value: 43
          Titles:
            – TitleFull: Experimental Thermal & Fluid Science
              Type: main
ResultId 1