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为了研究龙卷风场中沙粒相对结构的作用,首先利用以平均Navier-Stokes方程和RNG k-ε湍流模型为基础的湍流基本方程以及CFD数值方法构建了龙卷风场,并与Rankine涡模型进行对比分析,验证其正确性。随后引入离散相模型,求解了龙卷风场中沙粒运动轨迹,进而探讨了龙卷风场中沙粒对结构的冲击作用。最后,以三门核电常规岛为例,计算发现,当沙粒的体积分数达到0.02%时,顺风向沙粒对结构的冲击等效合力为纯龙卷风作用时的22%,其对结构的作用不可忽视。
In order to study the effect of the relative structure of the sand grains in the tornado field, the tornado field was constructed by using the basic turbulence equations based on the average Navier-Stokes equation and the RNG k-ε turbulence model and the CFD numerical method, and compared with the Rankine vortex model , Verify its correctness. Then the discrete phase model is introduced to solve the movement of sand particles in the tornado field, and then the impact of sand on the structure in the tornado field is discussed. Finally, taking the conventional Sanmen nuclear power plant as an example, it is found that when the volume fraction of sand reaches 0.02%, the equivalent resultant force of the impact of sand on the structure is 22% of the pure tornado, and its effect on the structure Can not be ignored.