双级旋风分离器特性的计算机预报

来源期刊：中南大学学报(自然科学版)1999年第5期

论文作者：杨卫宏 萧泽强

文章页码：493 - 496

关键词：旋风分离器;数值计算;旋流

Key words：gas cyclones; numerical calculation; swirl flow

摘    要：利用计算流体力学CFX4.2软件对双级旋风分离器的气固两相流进行了三维数值模拟，采用贴体坐标系统描述复杂的几何边界和基于交错网格的网格系统；对于气相流场，采用雷诺应力模型计 算旋转流动，在拉格朗日坐标中计算粒子运动．为优化求解，采用多块结构适体网格，利用SIMPLE算法解离散方程；此外，给出了双级旋风分离器内不同截面的速度分布和5种不同尺寸共60个粒子轨迹．研究结果表明，双级旋风分离器比常规的旋风分离器分离效果要好．

Abstract: The gas solid two phase 3D swirling flow in a large scale cyclone modified with a two-stages separation has been in-vestigated by mathematical simulation with CFX4.2 codes. The gaseous flow was simulated by using Reynolds stress tur-bulence model,while the solid movement by Lagrangian approach. The computing method used is the SIMPLE method. The multi-block grid methodology involving the use of an unstructured set of block is used. The moving trajectory of 60 particles of 5 kinds of different sizes with a certain solid fraction and various sections velocity field were traced by the computer calculation. It has been confirmed that the two-stage separation in the inner tube will improve the efficiency of the cyclone.