固-液两相流充填管道输送冲蚀磨损数值研究

 为探究充填管道在输送过程中的冲蚀磨损机理, 基于工程流体力学理论及颗粒输送力学模型, 引入离散颗粒轨道模型、塑性冲蚀磨损模型, 对某矿山复杂充填管路条件下浆体特性对管道冲蚀磨损影响进行研究。结果表明, 浆体流速、黏度以及颗粒尺寸对管道冲蚀磨损影响显著, 颗粒形状影响较弱。高流速下, 弯管磨损最为严重, 直管段磨损较轻且分布较为均匀, 流速降低, 主要磨损部位偏向弯管出口部位;弯管部位最大磨损值在15°~30°以及60°~75°之间;此外, 粒径较小时, 磨损严重程度随粒径增加而增大, 粒径达到600 μm 后, 最大磨损值随粒径增加呈现下降趋势。

Numerical investigation of impact erosion in liquid-solid two-phase flow of the backfilling pipe

Based on engineering fluid mechanics and the mechanical model of particle transportation, discrete particle model and ductile impact erosion model were applied for investigating pipe impact erosion influenced by slurry characteristics in complex backfilling pipeline in a mine, aiming to study the impact erosion mechanism of backfilling pipe during transportation. The results show that pipe impact erosion was largely influenced by slurry velocity, viscosity and particle size, while slightly influenced by particle shape. At high flow velocity, compared with straight pipe, in which the erosion zone is distributed relatively uniformly in the pipe wall, the bended pipe had the most serious impact erosion zone with the maximum erosion value in the range of 15°-30°and 60°- 75° at low flow velocity, the main impact erosion zone transferred to the exit of the bended pipe. The erosion increased with increase of particle size when the particle had a small diameter, but decreased when the particle reached the diameter of 600 μm.