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研究核反应堆中带有交混器的棒束内流场,对提高整个核动力装置的可靠性和经济性具有重大意义。本文应用二维激光多普勒测速仪详细地测量了带有交混器的16根燃料棒方形布置的棒束内绝热流动的横向流速及其湍流强度。流体纵向冲刷棒束,棒束内轴向平均流速为2.5m/s,相应的雷诺数为1.42×10~4。燃料棒间距为1.375D,棒与壁面间距为0.77D。测量结果表明,交混器大大加强了棒束间的横向流动。由于交混器的存在,子通道内的主流形成了柱形涡流,涡流的旋转方向与叶片倒向相同。但在燃料棒的间隙中,横向速度发生了转向。中心子通道上的四个交混面上的横向流动满足质量守恒条件。作者还提出了“非均匀交混”的概念。
Studying the flow field inside a bundle with a blender in a nuclear reactor is of great significance for improving the reliability and economy of the entire nuclear power plant. In this paper, a two-dimensional laser Doppler velocimeter was used to measure in detail the lateral flow velocity and turbulence intensity of adiabatic flow in a square bundle of 16 fuel rods with a mixer. The fluid longitudinal scouring of the bundle, the axial average flow velocity within the bundle of 2.5m / s, the corresponding Reynolds number of 1.42 × 10 ~ 4. Fuel rods spaced 1.375D, rod and wall spacing of 0.77D. The measurement results show that the mixer greatly enhances the lateral flow between the bundles. Due to the existence of the blender, the main flow in the subchannels forms a cylindrical vortex, and the direction of rotation of the vortex is the same as that of the blades. However, in the gap between the fuel rods, the lateral speed turned. The lateral flow on the four intersecting surfaces on the central subchannel satisfies the conservation of mass. The author also proposed the concept of “non-uniform”.