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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27 000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。
HTR-10 developed by Tsinghua University is an internationally advanced experimental reactor. The study of the ball-flow movement plays a fundamental role. By means of the phenomenological method, discrete element numerical simulation of the ball-stream motion of the HTR-10 core was carried out. Based on the experimental program which has been verified by experiments and the calculation model of 1: 1 with HTR-10 core, 27,000 The motion of the element unit includes the ball flow motion with different coefficients of friction f and different bottom cone angles A. The results show that under the core design conditions of HTR-10, the ball flow is more uniform and no stagnant zone exists at the bottom of the core. The larger the f is or the larger A is, the more uniform the ball flow of the core is and the better the overall integrity is. Movement; When f reaches the upper limit of 0.8, HTR-10 core ball flow still maintained a monolithic movement, the bottom of the ball without any retention. This work is of great significance to further optimize the core design of ball bed HTR reactor.