摘要：采用标准k-ε湍流模型和随机颗粒轨道模型及其两相耦合求解对叶片间气-固两相流场进行数值模拟研究,设计一种外侧后弯、内侧前弯的涡流分级机"Z"形转子叶片,并以叶片间的流场作为模型,讨论不同前弯、后弯倾角下的流场规律。结果表明,叶片外侧后弯使叶片迎风面的高速反冲气流迅速将叶片背风面的惯性反旋涡抵消;叶片内侧前弯使叶片间流场出口处附近的前倾气流迅速流出,减少回流现象,因此该异形叶片能减少叶片间的局部涡流,有利于分级的进行。试验结果表明其分级效率和分级精度都有明显提高。

关键词：涡流分级机; 异形叶片; 两相流; 数值模拟;

Abstract：The k-ε turbulent model and Eulerian-Lagrangian model as well as their coupling solution were adopted to carry on two-phase numerical simulation on fluid between two vanes.A type of outside part curved backward and inside part forward bending “Z” shape vane of vortex air classifier was designed,and the fluid between vanes were taken to be the model of numerical simulation,then the fluid disciplines under different obliquities were discussed.The results showed that the vane with outside part curved backward made the high kick-back airflow from windward side of vane counteract the inertia backward vortices near lee side of vane,when the vane with inside part forward bending made the airflow at the outlet discharging rapidly and reducing backflow.So“Z” shape heteromorphic vanes could reduce region whirlpool between two vanes,it was favor-able for classification.According to experiments,it was proved that classifying efficiency and precision were all improved.

Keyword：vortex air classifier;heteromorphic vanes;air-solid two-phase;numerical simulation;