一回路腔室结构对自然循环铅基快堆堆芯流量分配特性影响研究

The core flow distribution characteristics are an important part of the thermohydraulic design of natural circulation lead-based fast reactors, and the geometric structure of the primary circuit chamber is one of the important factors affecting the core flow distribution characteristics. The computational fluid dynamics method (CFD) is used to simulate the flow field of the primary circuit of a small modular natural circulation lead-cooled fast reactor (SNCLFR - 10 MW), and the effects of the height of the riser in the upper chamber of the primary circuit, the radius and length of the central measuring column, the depth, aspect ratio and the height of the flow guiding structure of the lower chamber on the core flow distribution characteristics are studied respectively. The research results show that changing the height of the riser, the radius and length of the central measuring column has a greater impact on the core flow distribution characteristics; changing the depth and aspect ratio of the lower chamber of the reactor has no significant impact on the overall core flow and flow distribution characteristics; installing an angular protrusion-shaped flow guiding structure in the lower chamber of the reactor can effectively improve the flow field of the lower chamber, but cannot effectively change the core flow distribution characteristics.

堆芯流量分配特性是自然循环铅基快堆热工水力设计的重要内容,一回路腔室几何结构是影响堆芯流量分配特性的重要因素之一。利用计算流体力学方法(Computational Fluid Dynamics,CFD)模拟小型模块化自然循环铅冷快堆(Small Modular Natural Circulation Lead-cooled Fast Reactor-10 MW,SNCLFR-10)一回路流场,分别研究一回路上腔室提升筒高度、中心测量柱半径及长度,下腔室深度、纵横比以及导流结构高度对堆芯流量分配特性的影响特性。研究结果表明:改变提升筒高度、中心测量柱半径及长度对堆芯流量分配特性影响较大;改变反应堆下腔室深度和下腔室纵横比对堆芯整体流量和流量分配特性所造成的影响不显著;在反应堆下腔室加装角状凸起形导流结构可有效改善下腔室流场,但无法有效改变堆芯流量分配特性。