The flow field, vortex behaviour and pressure losses in a small-scale cyclone have been studied at a wide range of flow rate 0.23–39.7 NLPM (measured at 1 atm and \(20\,^\circ \hbox {C}\)) using the LES simulations that have been validated based on experimental measurements of the cyclone pressure drop. The following flow characteristics such as (1) the radial distribution of the tangential velocity; (2) the maximum tangential velocity and axial downward flow rate; (3) natural vortex length and rotation frequency of the vortex end; and (4) pressure losses in the cyclone have been analysed as a function of Reynolds number. The radial distribution of the tangential velocity inside the cyclone has been described by a proposed equation for adapted Burger’s vortex. The position of the lower end of the vortex (natural vortex length) as well as its rotational frequency have been investigated with the pressure sensing method. A unique vortex behaviour such as “vortex end jump” was revealed at some Reynolds numbers. Additionally, a deep analysis of the pressure losses in the cyclone has been performed which showed that the main pressure losses (up to 48%) occur in the vortex finder. Four flow regimes were revealed and a one-term power series model has been proposed to describe the effects of the Reynolds number on the Euler number (dimensionless pressure losses).

在小范围旋风分离器中研究了流场，涡旋行为和压力损失，流速范围为0.23–39.7 NLPM（在1个大气压和\（20 \，^ \ circ \ hbox {C} \）下测得）使用已基于旋风分离器压降的实验测量结果进行验证的LES模拟。以下流动特性如（1）切向速度的径向分布；（2）最大切向速度和轴向向下流速；（3）涡旋末端的自然涡旋长度和旋转频率；（4）旋风分离器中的压力损失已作为雷诺数的函数进行了分析。旋流器内切线速度的径向分布已通过提出的适用于伯格氏涡旋的方程式进行了描述。涡流下端的位置（自然涡流长度）及其旋转频率已通过压力感测方法进行了研究。一些雷诺数揭示了独特的涡旋行为，例如“涡旋末跳”。此外，对旋风分离器中的压力损失进行了深入分析，结果表明，主要的压力损失（高达48％）发生在涡流探测器中。揭示了四个流态，并提出了一个单项幂级数模型来描述雷诺数对欧拉数（无量纲压力损失）的影响。