摘要：为了给O-Sepa选粉机的分级区提供稳定的流场,提高分级效率,设计一种含导流叶片的蜗壳;采用重整化群k-ε湍流模型和离散相模型分别对O-Sepa选粉机的气相流场和气-固两相流场进行数值模拟,对比3种蜗壳的压力场、速度场、颗粒运动轨迹和分级效率。结果表明,含导流叶片的蜗壳比传统蜗壳和等进风面积蜗壳更节能,能为分级区提供更稳定的速度,颗粒的运动轨迹更顺畅,具有较高的分级效率,有效地提高了选粉机的分级性能。

关键词：O-Sepa选粉机；蜗壳结构；分级性能；气-固两相流；数值模拟

Abstract： To provide a steady flow field for O-Sepa classifiers and improve classification efficiency， a kind of volute with guide vanes was designed. The renormalization group （RNG） k-ε turbulence model and discrete phase model were respectively adopted for numerical simulation of gas phase flow field as well as gas-solid two-phase flow field of O-Sepa classifier. The pressure field， velocity field， particle trajectories and classification efficiency of three kinds of volutes were compared. The results show that comparing with the traditional volute structure and the volute structure with same area wind inlet， the volute structure with guide vanes is more efficient in energy， which can provide more stable speed for classification area. The particles trajectories in the volute structure with guide vanes are smoother. The classification efficiency of fine powders is more efficient and the classification performance of the classifiers is effectively improved. 

Keywords: O-Sepa classifier； volute structure； classification performance； gas-solid two-phase flow； numerical simulation