HTR-10堆芯球流运动的唯象学 DEM 模拟

摘要

The 10 MW High Temperature Gas-cooled Reactor (HTR-10) ,developed at Tsinghua University ,is an important test advanced reactor in the world .The pebble flow is of fundamental significance for the HTR-10 . The discrete element method validated by experiments was used to study pebble flow in the HTR-10 core by the phenomenological method . A 1 ∶ 1 scale computational model to the HTR-10 was utilized to simulate the motion of 27 000 spheres ,including the flows with different frictional coefficients and base angles . It is found that the pebble flow inside the HTR-10 core is uniform .The stagnant region does not exist .The larger the frictional coefficient or the base angle is ,the more uniform the pebble flow is .When the frictional coefficient is 0.8 ,the HTR-10 maintains a normal discharge operation without stagnant pebbles .This work is important to further optimization of HTR design and development .%清华大学研发的10MW高温气冷堆（HTR-10）是国际上重要的先进实验反应堆，球流运动的研究具有基础性地位。通过唯象的方法对HTR-10堆芯的球流运动进行了离散元数值模拟，通过已由实验验证的计算程序，采用与HTR-10堆芯1∶1的计算模型，计算了27000个元件单元的运动，包括不同摩擦系数f和不同底部锥角A下的球流运动。结果表明：在HTR-10堆芯设计条件下，球流运动较均匀，堆芯底部不存在滞留区；f越大或A越大，堆芯球流越均匀，表现出更好的整体性向下运动；当f达到0.8上限时，HTR-10堆芯球流依然保持了整体性运动，底部无任何被滞留的球。本工作对进一步优化球床式高温气冷堆堆芯设计具有重要意义。