IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v17y2024i6p1274-d1352728.html
   My bibliography  Save this article

Optical Analysis of Ignition Sparks and Inflammation Using Background-Oriented Schlieren Technique

Author

Listed:
  • Moritz Grüninger

    (Institute of Internal Combustion Engines (IFKM), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany)

  • Olaf Toedter

    (Institute of Internal Combustion Engines (IFKM), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany)

  • Thomas Koch

    (Institute of Internal Combustion Engines (IFKM), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany)

Abstract

To determine the timing of inflammation in gas and gasoline combustion engines, the point of 10% mass fraction conversion of fuel (MFB10) is commonly used. The MFB10 can be determined from the heating curve, which in turn is calculated from the in-cylinder pressure curve. However, the cylinder pressure is an indirect parameter with regard to inflammation, as it is the result of the combustion that follows the inflammation. An attempt is made to derive a new, direct parameter of inflammation based on optical measurements in order to detect inflammation more rapidly and accurately. The background-oriented Schlieren technique (BOS) in combination with high-magnification optics and a high-speed camera is used to detect local density changes coming from the particle wave around the ignition kernel of a hydrogen combustion inside a combustion chamber. Via BOS and regular high-magnification high-speed imaging, the influence of ignition coil dwell time and in-cylinder pressure on the spark phases and the inflammation itself are evaluated. As a potential direct parameter for inflammation, the size of the particle wave resulting from the expanding ignition kernel is evaluated. It was found that a higher coil energy supports a faster propagation of the particle wave at ambient pressure. At higher pressures, general combustion effects override the effect of the influence of the coil energy on the propagation speed of the particle wave. In addition, the presence of successful inflammation was found to influence the spark phases. A directly measurable parameter for ignition could be found at a basic level, which will serve as a starting point for further detailed investigations.

Suggested Citation

  • Moritz Grüninger & Olaf Toedter & Thomas Koch, 2024. "Optical Analysis of Ignition Sparks and Inflammation Using Background-Oriented Schlieren Technique," Energies, MDPI, vol. 17(6), pages 1-18, March.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:6:p:1274-:d:1352728
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/17/6/1274/pdf
    Download Restriction: no

    File URL: https://www.mdpi.com/1996-1073/17/6/1274/
    Download Restriction: no
    ---><---

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:17:y:2024:i:6:p:1274-:d:1352728. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.