二维球流运动摩擦系数影响的数值模拟

Numerical Simulation on Friction Coefficient Effect of Pebble Flow Dynamics in Two-dimensional Pebble-bed Reactor

为研究摩擦系数对球流运动的影响,参照二维堆芯球流运动实验台架,采用离散单元法对球流运动进行了数值模拟,并对从标记点产生的球流区域的均值流线、标准方差和平均停留时间等进行了比较和分析。结果表明:球的摩擦系数对球流流场影响不大;球的摩擦系数越大,水平方向扩散越小,流动越均匀;壁面摩擦系数对水平方向扩散影响不大;壁面摩擦系数越大,流动越不均匀。

In order to investigate the pebble flow dynamics in the high-temperature reactor core and based on the two-dimensional experiments of pebble flow dynamics,discrete element method（DEM） was used to simulate the pebble flow dynamics.The mean flow stream lines,standard deviation and the mean residence time of the pebble flow zone generated by markers were compared and analyzed.The results show that ball friction coefficient has little effect on the pebble flow field.With the pebble friction coefficient increasing,the horizontal diffusion of pebbles decreases and the pebble flow seems to be more uniform.The wall friction coefficient has little effect on the horizontal diffusion.While the wall friction coefficient increases,the flow tends to be more uneven.