2×2棒束通道格架搅混翼横向流场PIV实验研究

PIV Experiment Research of Lateral Flow Field in 2×2 Rod Bundles Channel with Mixing Vane Grids

以2×2放大棒束通道格架模型为基础,利用粒子图像测速(PIV)对格架搅混翼引起的燃料组件棒束通道内横向流场特性进行实验研究。测量流体经过格架搅混翼后不同位置的横向速度发展情况,比较折弯角分别为20°、25°、30°、35°、40°和45°时横向流场的变化情况,给出雷诺数对横向流场的影响。获得4个典型雷诺数(Re为33000、36000、40000、45000)下的流场特性。结果表明,Re和搅混翼折弯角度的改变,都会显著影响棒束通道内横向流动。

Based on the scale-up model of 2×2 rod bundle channel, an experimental study of effects of mixing vane on lateral flow field in rod bundle channels of fuel assembly was performed with particle image velocimetry （PIV）. The development of lateral flow velocity at different places after the fluid passing through mixing vanes was investigated. The effect of Reynolds number on the lateral flow field was gained by comparing the changes of the flow fields when bending angles equal 200,25°, 30°, 35°, 40° and 45°. The characteristics of flow fields under four typical Reynolds numbers, which were 33000, 36000, 40000 and 45000, were gained. The results show that both of Reynolds number and bending angle can significantly influence the lateral flow in the rod bundle channel.