This study analyzed the effect of the angle of the inlet duct bend on the separation efficiency and pressure drop in cyclone separators. The design of the inlet to the cyclone chamber is a significant parameter that has been analyzed to date only in a few research studies. Following the literature review of this subject, 20 bend angles (10 in the vertical plane and 10 in the horizontal plane) were proposed and analyzed by means of the computational fluid dynamics code Fluent V18.2. As a closure model to the Reynolds-averaged Navier–Stokes equation, the Reynolds stress model was used, as it solves the transport equations for Reynold’s stresses and the dissipation rate - this model is capable of accounting highly curved streamlines prevailing inside the cyclone separators. The discrete phase model with one-way coupling was used, in which the trajectory of solid particles was calculated based on Lagrangian formulation. Conclusive results indicate that the bend angle (in both planes) marginally affects the collection efficiency (the maximum difference being 3.1%), whereas its effect on Eu is highly significant (the difference being 5700%) - all the comparisons were made with respect to the base variant at 0° angle.

这项研究分析了入口管道弯曲角度对旋风分离器分离效率和压降的影响。旋风室入口的设计是一个重要的参数，迄今为止仅在一些研究中进行了分析。在对该主题进行文献综述之后，提出了20个弯曲角（垂直平面为10个，水平面为10个），并通过计算流体力学代码Fluent V18.2进行了分析。作为雷诺平均Navier–Stokes方程的闭合模型，使用了雷诺应力模型，因为它解决了雷诺应力和耗散率的输运方程式-该模型能够解决旋风分离器内部普遍存在的高度弯曲的流线。使用具有单向耦合的离散相位模型，其中固体颗粒的轨迹是根据拉格朗日公式计算的。最终结果表明，弯曲角度（在两个平面上）对收集效率都有轻微的影响（最大差异为3.1％），而对Eu非常显着（差异为5700％）-所有比较都是针对0°角处的基本变体进行的。