垂直螺旋输送机气固两相流的试验及数值模拟

发布时间：2018-03-12 22:12

本文选题：垂直螺旋输送机　切入点：欧拉双流体模型　出处：《计算机与应用化学》2016年06期 　论文类型：期刊论文

【摘要】：在试验的基础上,采用欧拉-欧拉双流体模型对垂直螺旋输送机气固两相流动进行了数值模拟,分析了输送过程中的颗粒速度、混合相压力、颗粒体积分数、颗粒填充率和颗粒拟温度的分布。结果表明:颗粒轴向速度受进口和出口影响较大,本文根据轴向速度的分布,将流场分为进口影响区,稳定输送区,出口影响区。在稳定输送区内,颗粒总速度在管壁处较大,由于间隙的存在,颗粒轴向速度在靠近管壁处较小,最大值仅出现在叶片外缘处。混合相压力随着高度的增加而增大,在出口处略大于大气压。随着转速的增加,颗粒填充率减小,颗粒逐渐聚集在管壁和叶片外缘处,单个螺距内且呈V形分布。叶片上的颗粒拟温度沿径向自内向外逐渐增大,靠近管壁处的颗粒拟温度大于流道中的颗粒拟温度,可用颗粒拟温度来表示叶片磨损情况。
[Abstract]:On the basis of the experiment, the gas-solid two-phase flow of vertical spiral conveyor is simulated by using Euler-Euler two-fluid model. The particle velocity, mixed phase pressure and particle volume fraction in the conveying process are analyzed. The distribution of particle filling ratio and particle pseudo temperature. The results show that the axial velocity of particles is greatly affected by inlet and outlet. According to the distribution of axial velocity, the flow field can be divided into import influence zone and stable transport zone. In the stable conveying area, the total particle velocity is larger in the pipe wall, because of the existence of the gap, the particle axial velocity is smaller near the pipe wall. The maximum value appeared only at the outer edge of the blade. The mixed phase pressure increased with the increase of height and was slightly larger than atmospheric pressure at the outlet. With the increase of rotational speed, the particle filling ratio decreased, and the particles gradually gathered in the tube wall and the outer edge of the blade. The particle pseudo-temperature on the blade increases gradually from the inside to the outside along the radial direction, and the particle pseudo-temperature near the pipe wall is larger than the particle pseudo-temperature in the flow channel, which can be used to describe the wear of the blade.
【作者单位】：浙江工业大学机械工程学院;
【基金】：浙江省公益性技术应用研究计划项目(2014C31023)
【分类号】：TH224

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