Department of Aerodynamics and Fluid Mechanics, Brandenburg University of Technology Cottbus-Senftenberg, Cottbus, Brandenburg, Germany.
Philos Trans A Math Phys Eng Sci. 2023 May;381(2246):20220113. doi: 10.1098/rsta.2022.0113. Epub 2023 Mar 13.
In this study, we discuss the observed flow regimes in Taylor-Couette flow of radius ratio [Formula: see text] for various Reynolds numbers up to [Formula: see text]. We investigate the flow using a visualization method. The flow states in the centrifugally unstable flow are investigated in the case of counter-rotating cylinders and pure inner cylinder rotation. Beside classical known flow states as Taylor-vortex flow and wavy vortex flow, we observe a variety of new flow structures in the cylindrical annulus, especially for the transition to turbulence. Coexisting turbulent and laminar regions inside the system are observed. Turbulent spots and turbulent bursts are observed, as well as an irregular Taylor-vortex flow and non-stationary turbulent vortices. Especially, a single axially aligned columnar vortex between the inner and outer cylinder is found. The principal regimes observed in flow between independently rotating cylinders are summarized in a flow-regime diagram. This article is part of the theme issue 'Taylor-Couette and related flows on the centennial of Taylor's seminal paper (Part 2)'.
在本研究中，我们讨论了在半径比[Formula: see text]的泰勒-库埃特流中观察到的流型，雷诺数高达[Formula: see text]。我们使用可视化方法研究了流动。我们研究了在对转圆柱和纯内筒旋转情况下离心不稳定流动中的流态。除了作为泰勒涡旋流和波状涡旋流的经典已知流型之外，我们还在圆柱环中观察到了多种新的流结构，特别是在向湍流的过渡中。在系统内部观察到共存的湍流和层流区域。观察到了湍流斑点和湍流爆发，以及不规则的泰勒涡旋流和非定常的湍流涡。特别是，在外筒和内筒之间发现了一个单独的轴向排列的柱状涡旋。在独立旋转的圆柱之间观察到的主要流型在流型图中进行了总结。本文是主题为“泰勒-库埃特流和相关流动：泰勒开创性论文百年纪念（第 2 部分）”的一部分。
