摘要：为了探究弯管中高浓度煤粉气力输送的流动特性，采用Savage的颗粒动力学模型，引入校正后的阻力系数模型和径向分布函数，建立了高浓度煤粉气力输送的数学模型，并用该模型对垂直转水平90°弯管中的压降与流动分布规律进行数学模拟研究。结果表明：在垂直转水平弯管段的高浓度煤粉气力输送过程中，弯管处存在明显的二次流、涡流、塌陷和堆积等现象；弯管段的总压降会随着输送的煤粉颗粒粒径、输送固气比以及输送速度的增大而增大。这些研究结果对高浓度煤粉气力输送的输送条件及管路的设计具有重要意义。

Abstract：In order to investigate the conveying characteristics of dense phase pulverized coal in bend pipe, a mathematical model of dense phase particle pneumatic conveying was established by using the kinetic theory of granular flows and introducing the improved frictional resistance coefficient of particles and radial distribution function. And then mathematical model was used to simulate the pressure drop and flow distribution of dense phase pulverized coal pneumatic conveying in 90° bend pipe with vertical rotating to level. The results show that the phenomena of second flow zone, vortex zone, subsidence zone, and particle packing are found in the place where the pipe is bending; and the total pressure drop of bend pipe increases with the increasing of particle size of the pulverized coal particles, the solidgas ratio, as well as the conveying speed, respectively. These findings are of great significance for the conveying conditions of dense phase pulverized coal pneumatic conveying as well for the design of pipelines.