沙尘在防沙堤附近沉积特性的数值模拟

摘要

为研究沙尘在防沙堤附近的沉积特点,基于FLUENT软件,采用标准K-ε湍流模型和DPM模型对沙尘在防沙堤附近的运动轨迹进行数值模拟.结果表明,沙尘的运动轨迹受自身粒径、风速及防沙堤迎风面坡度的综合影响,沙粒粒径越小,风速越大,防沙堤迎风面坡度越缓,沙粒越过防沙堤的能力越强；除风速较低时部分小粒径颗粒沉积在防沙堤后端外,其余情况下沙尘沉积主要发生在防沙堤前端.%To study the sedimentation characteristics of sand dust around sand preventing dyke, the particle tracks were simulated by the standard A' -e model and DPM model based on FLUENT software. The results show that particles moving tracks are affected by particles size, wind velocity and sand preventing dyke l/h ratio of windward side synthetically. The sand dust quantity passing sand preventing dyke increases with wind velocity and l/h, and decreases but the case is just converse with particle size. Customarily most sand dust accumulate in front of the sand preventing dyke, only a little fine particles accumulate in the leeward at lower wind speed.