90°方截面弯管内加装导流板的优化研究

Optimization Research on Guide Plate Installed in Quadrate 90° Curved Duct

许多工程中的弯管都存在严重的磨损和积灰问题,流场分布不均是主要原因之一.应用计算流体力学软件Phoenics对90°方截面弯管内气固两相流进行了数值模拟.模拟采用k-ε双方程模型和IPSA两相流模型,以速度、压强等参数的流场分布图形方式输出模拟结果,分析了弯管内气固两相流流场的分布规律.弯管内不加导流板时,流场分布不均匀.在弯管中加装导流板具有均匀流场的作用,为管道磨损和积灰问题的解决提供了一条有效的途径.通过模拟分析得到了在弯管内加装导流板的最佳条件:导流板数量为3块,板的圆心角为70,°内侧板和中间板的起始位置为10°、外侧板的起始位置为0,°板间距内外两侧小、中间大.

The problem of serious wear and sedimentary dust occurs in curved duct of much engineering. Uneven distribution of flow field is one of the main reasons. By using Computational Fluid Dynamics （CFD） software Phoenies, the numerical simulation of gas-solid two-phase flow in quadrate 90° curved duct has been finished. The κ-ε equation model and IPSA two-fluid model are adopted in numerical simulation. The distribution graphs of speed, pressure and others of the flow field are exported. The distribution law of gas-solid two-phase flow in curved duct is analyzed. The flow field of quadrate curved duct without guide plate is uneven. The guide plates installed in curved duct can make flow field uniform and provide an effective way for solving the problem of wear and sedimentary dust in curved duct. The best conditions for guide plates installed in curved duct are achieved. Three guide plates with 70° central angle are needed. The inner and medium guide plates start from 10°. Outer guide plate starts from 0°. The distance from inner and outer guide plates to wall is smaller than the distance from inner and outer guide plates to medium plate.