IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v325y2025ics0360544225016123.html
   My bibliography  Save this article

Flow stability and complex network analysis in a swirl combustor with dump and slope confinement

Author

Listed:
  • Qin, Ziyu
  • Lin, Yuzhen
  • Song, Heng
  • Han, Xiao

Abstract

The lean-premixed swirl combustor with slope confinement (SC) exhibits significant potential in attenuating thermoacoustic instability compared with traditional dump confinement (DC). In this study, we scrutinize the stability origin from the perspectives of flow stability and complex network analysis. First, the dominant temporal and absolute growth rates of SC are respectively reduced by 68.0% and 86.6% compared to DC. These reductions quantitatively demonstrate the superior capability of SC in suppressing temporal and absolute instability. Then, we propose a backflow ratio to distinguish the absolute instabilities in two cases. The stability enhancement in SC is characterized by a backflow ratio less than a critical value of 2, which stems from a less pronounced flow recirculation through eliminating the corner flow. Additionally, the flow complex network changes from a dual-ring structure in the DC case to a straight-chain structure in the SC case. The weighted closeness centrality measurement implies that the corner recirculation zone (CRZ) is responsible for self-excited flow oscillation. The network without CRZ features more difficult disturbance propagation, which is further conducive to mitigating instability.

Suggested Citation

  • Qin, Ziyu & Lin, Yuzhen & Song, Heng & Han, Xiao, 2025. "Flow stability and complex network analysis in a swirl combustor with dump and slope confinement," Energy, Elsevier, vol. 325(C).
    • Handle: RePEc:eee:energy:v:325:y:2025:i:c:s0360544225016123
    DOI: 10.1016/j.energy.2025.135970
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544225016123
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2025.135970?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    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:eee:energy:v:325:y:2025:i:c:s0360544225016123. 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: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/energy .

    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.