定位格架下游流场可视化实验方法研究

Investigation on Visualization Test Methods for Flow Field Downstream Spacer Grids

粒子成像测速(PIV)和激光多普勒测速(LDV)等可视化测量技术被应用于定位格架下游流场的实验研究时,棒束对激光的遮挡或折射导致的光学图像或信号的畸变,限制了测量位置。使用折射率补偿技术针对组件内高雷诺数流动提出了FEP和水以及有机玻璃和碘化钠水溶液的折射率补偿方案。实验验证表明,2种折射率补偿方案可应用于可视化测量,获得棒后方流场信息。

When visualization measurement techniques, such as particle image velocimetry （PIV） and laser Doppler velocimetry （LDV）, are applied in rod bundle experiments, measurement locations are restricted due to blockage and refraction by solid rods. Employing matched index of refraction （MIR） techniques for the high Reynolds number flow in fuel assembly, the MIR method of FEP and water and the MIR method PMMA and sodium iodide solution are chosen and tested. The results show that the flow field behind rods can be achieved bv the two MIR methods.