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Influence of Vortex-Finder Diameter on Axial Gas Flow in Simple Cyclone

机译：旋风分离器直径对简单旋风分离器轴向气流的影响

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Several types of flow patterns in cyclones were found in recent publications. As a means fornstructuring the findings the publications were split up into two classes. Each class represented ancertain feature of the axial velocity profile of the gas flow inside the cyclone. Class V representsncyclones with a maximum of the axial velocity at the vortex core of the cyclone, whereas Class Wnrepresents cyclones with an axial velocity profile that resembles an upside down W. This class hasna local minimum of axial velocity at the vortex core or even displays backflow.nThe geometries of the cyclones belonging either to Class V or to Class W showed only smallnrelative differences. It was assumed that the diameter of the vortex finder had a great influence onnthe class membership. This influence was simulated and measured for different basic geometries.nThe goal of this work was to develop the basics for reliable simulation results using the preprocessornGAMBIT and the finite volume CFD code FLUENT (which also serves as a postprocessor).nLaser Doppler Anemometry (LDA) experiments were carried out on a laboratory scale cyclone tonverify simulation results.nIn addition the results of cyclones which were investigated in previously published papers werenused as a basis for developing a method of simulation, to validate numerical results and class membership.nThe prediction of pressure drop over the cyclone is overestimated by FLUENT (regardingnthe test cases). It was proven experimentally that downstream geometry (pipes etc.) has a greatninfluence on flow profiles inside the cyclone. The axial flow profile can change dramatically ifnthe pipes downstream the vortex finder are removed. A Class V cyclone displaying a maximum ofnaxial velocity at the vortex core can change to a ClassWcyclone with a minimum of axial velocitynat the vortex core.
机译：在最近的出版物中发现了旋风分离器中的几种流型。作为解释研究结果的一种手段，这些出版物分为两类。每个类别代表旋风分离器内气流的轴向速度分布的某些特征。 V类代表旋风分离器的旋涡芯处的轴向速度最大值，而Wn类代表旋风分离器的轴向速度轮廓类似倒置的W。该类旋风分离器在旋涡芯处具有局部轴向速度最小值，甚至表现出回流.n属于V级或W级的旋风分离器的几何形状仅显示出较小的相对差异。假定涡流探测器的直径对阶级成员有很大的影响。针对不同的基本几何形状对这种影响进行了仿真和测量。n这项工作的目标是使用预处理器n GAMBIT和有限体积CFD代码FLUENT（也用作后处理程序）来开发可靠的仿真结果的基础。n激光多普勒风速仪（LDA）在实验室规模的旋风分离器上验证了模拟结果。n此外，还利用了先前发表论文中研究的旋风分离器的结果作为开发模拟方法的基础，以验证数值结果和类成员。n压降的预测FLUENT高估了旋风除尘器（关于测试用例）。实验证明，下游的几何形状（管道等）对旋风分离器内部的流量分布有很大的影响。如果拆除涡流探测器下游的管道，则轴向流动轮廓会发生巨大变化。在涡旋芯处显示最大轴向速度的V级旋风分离器可以更改为具有最小轴向速度的W类旋风分离器。

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