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First and second-order models for the vortex length in cylinder-on-cone cyclones based on large-eddy simulations

机译:基于大涡模拟的圆柱对锥旋风分离器旋涡长度的一阶和二阶模型

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摘要

The common design of cyclone separators is the cylinder–on–cone design, and the conical shape has a strong effect on the behavior of the vortex core low in the cyclone. The “vortex length” is the distance between the lip of the gas outlet tube and the position at which the core of the vortex attaches to the wall of the cyclone separation space. This occurs spontaneously at an axial position that, at present, cannot be predicted, although it has a profound effect on the cyclone operation, since, if the vortex is too short, it can lead to plugging and wear. In this paper numerical CFD simulations, using advanced turbulence modeling (LES), are the basis for the formulation of models for the vortex length taking into account the geometrical and operational variables influencing it. The work leads to useful models for the vortex length and reveals important information about which variables determine it and the nature of their effects.
机译:旋风分离器的常见设计是圆柱对锥设计,并且圆锥形形状对旋风分离器中涡流核心的行为有很大影响。 “涡旋长度”是排气管的唇缘与涡旋的芯附着于旋风分离空间的壁的位置之间的距离。尽管它对旋风分离器操作有深远的影响,但它自发地发生在目前无法预测的轴向位置,因为如果涡旋过短,会导致堵塞和磨损。在本文中,使用高级湍流建模(LES)进行的CFD数值模拟是考虑到影响涡旋长度的几何和操作变量,从而为涡旋长度模型建立模型的基础。这项工作为涡旋长度建立了有用的模型,并揭示了有关哪些变量决定涡旋及其影响性质的重要信息。

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