一种内置旋流叶片的旋风分离器性能数值研究

提出了一种新的高效旋风分离器构造,在传统分离器的内外涡旋交界面上添加一组与气流旋转方向相同的旋流叶片,来阻挡含尘气流中的颗粒进入内涡旋区.基于计算流体力学(CFD),采用雷诺应力模型和离散相的随机轨道模型来计算分离器的气固两相流,并用试验数据验证了计算模型的正确性;通过数值计算分析、比较了添加旋流叶片前后的分离器性能,对旋流叶片进行了性能优化.结果显示,与传统分离器相比,添加旋流叶片能够使分割粒径减小60%～70%,有效地提高了分离效率,而压降仅增加19.3%,且旋流叶片对于小粒径、小密度颗粒的分离效率提升更为显著.

Numerical Simulation Study on Performance of a Cyclone Separator with Build-in Swirling Blades

This paper presented a new efficient cyclone separator, which can block the particles moving to the inner vortex. The new cyclone separator was obtained by setting a group of swirling blades with the same direction as the rotating direction of the air flow in the internal and external vortex interface of the traditional separator. The Reynolds model and discrete phase model were selected to simulate the gas-solid two-phase flow, and the discrete random walk model was used to study the turbulent dispersion of particles. The accuracy of the numerical simulation was verified by comparing with the experimental data. The performance between the traditional cyclone and new efficient cyclone was compared by numerical simulation. Moreover, the optimization of the swirling blades was performed. The results show that, compared with the traditional cyclone, adding the swirling blades effectively improves the separation efficiency, which can decrease the cut-off size by 60%~70% and increase the pressure drop by 19.3% only. Further, the effect of swirling blades on the separation efficiency of small particle size and low density particles was more significant.