DYNAMIC CHARACTERISTICS OF THE TIP CLEARANCE FLOW BASED ON THE LEAKAGE FLOW MODEL

Shiyan Lin, Ruiyu Li, Limin Gao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Leakage flow in the tip region significantly affects the turbomachinery performance, such as the efficiency, aerodynamic stability and noise. An accurate and in-depth understanding of the dynamic characteristics of leakage flow is the premise of the flow mechanism analysis and flow control. A simplified three-dimensional multi-wall leakage flow model was employed, which characterizes the unique geometric feature of multiple walls with a tip narrow gap and aerodynamic characteristics, i.e., the shear layer between confined jet and mainstream and the tip leakage vortex (TLV). Subsequently, the wall-adapt local eddy-viscosity large-eddy (WALE LES) simulation was used for the simulation. Based on the Liutex and Spectral proper orthogonal decomposition (SPOD) method, the flow structure, main fluctuation structure and unsteady source of the leakage flow were studied. The results shows that there are TLV, secondary tip leakage vortex (STLV) and induced vortex (IV) in the tip field driven only by the leakage flow. The main fluctuation contains the shake of the TLV’s core, breakdown of the IV and generation of the STLV. Furthermore, the STLV has a crucial influence on the development of the vortex structure and unsteady characteristic of the tip field. Kelvin–Helmholtz instability induced by the strong shear layer under the influence of small disturbances is at the bottom of the explosion. However, this cannot be resolved by the Reynolds-averaged Navier-Stokes (RANS) method.

Original languageEnglish
Title of host publicationTurbomachinery - Axial Flow Fan and Compressor Aerodynamics
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791888056
DOIs
StatePublished - 2024
Event69th ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition, GT 2024 - London, United Kingdom
Duration: 24 Jun 202428 Jun 2024

Publication series

NameProceedings of the ASME Turbo Expo
Volume12A

Conference

Conference69th ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition, GT 2024
Country/TerritoryUnited Kingdom
CityLondon
Period24/06/2428/06/24

Keywords

  • Kelvin–Helmholtz instability
  • Large eddy simulation
  • Simplified model
  • Spectral proper orthogonal decomposition
  • Tip leakage flow

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