Unsteady flow evolution in swirl injector with radial entry. I. Stationary conditions

Shanwu Wang, Shih Yang Hsieh, Vigor Yang

研究成果: Article同行評審

61 引文 斯高帕斯(Scopus)


The vortical flow dynamics in a gas-turbine swirl injector were investigated by means of large eddy simulations. The flow enters the injector through three sets of radial-entry, counter-rotating swirl vanes. The formulation treats the Favre-filtered conservation equations in three dimensions along with a subgrid-scale model, and is solved numerically using a density-based, finite-volume approach with explicit time marching. Several methods, including proper orthogonal decomposition, spectral analysis, and flow visualization, are implemented to explore the flow dynamics in the complex three-dimensional flowfields. Various underlying mechanisms dictating the flow evolution, such as vortex breakdown, the Kelvin-Helmholtz instability, and helical instability, as well as their interactions, are studied for different swirl numbers. The flowfield exhibits well-organized motion in a low swirl-number case, in which the vortex shedding arising from shear instabilities downstream of the guide vanes drives acoustic oscillations of the mixed first tangential and first radial mode. The flowfield, however, becomes much more complicated at high swirl numbers, with each sub-regime dominated by different structures and frequency contents.

頁(從 - 到)045106-1-045106-13
期刊Physics of Fluids
出版狀態Published - 2005 4月

All Science Journal Classification (ASJC) codes

  • 計算力學
  • 凝聚態物理學
  • 材料力學
  • 機械工業
  • 流體流動和轉移過程


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