【摘要】 为研究含水土质在长距离竖直管道气力输送过程中的运动特性，采用计算流体力学（CFD）和离散单元法（DEM）耦合的方法，建立气固两相流耦合数学模型，并设计原理性实验验证仿真模型，最后对10%含水率土质在50 m竖直管道中的抽吸过程进行仿真，研究含水土质在长距离竖直气力输送下的流态、流速变化。研究结果表明：含水土质在竖直抽吸过程中呈现先向管道中轴线集中凝结，然后土质被迅速打散，最后趋向稀相输送的规律，在抽吸管道中后段会发生土块凝结的现象；土壤颗粒运动速度先急速增大后缓慢减小，气体流速在小范围内波动。更多还原

【Abstract】 In order to study the motion characteristics of water-bearing soil during long-distance vertical pipeline pneumatic conveying, a mathematical model of gas-solid two-phase flow was established by coupling computational fluid dynamics(CFD) and discrete element method(DEM). Principle experiments were designed to verify the simulation model. The suction process of soil with 10% water content in a 50 m vertical pipeline was simulated to analyze the flow pattern and speed of water-bearing soil during long-distance vertical pipeline pneumatic conveying. The research results indicate that during the vertical suction process, the water-bearing soil first condenses towards the axis of the pipeline, then it is rapidly dispersed and finally tends towards dilute phase transportation. The phenomenon of soil block condensation occurs in the mid-posterior section of the pipeline. The soil movement speed first rapidly increases and then slowly decreases, and the gas flow rate fluctuates within a small range.更多还原