Combining with acid-alkali visualization technology and Matlab software, we calculated the number of mixing time （dimensionless mixing time） Ntm and area coverage of IMRs of fluid. The differences in mixing performance between traditional impellers and flexible impellers was analyzed. The results showed that the area coverage of IMRs of the traditional impellers ranged from 40% to 50% at Ntm=l 0 800, which was very stable even after several hours of continuous mixing （Ntm=25 000）. At Ntm=10 800, the area coverage of IMRs of the flexible impellers was about 1%, and it completely disappeared at Ntm=25 000. Compared with the traditional impellers, the mixing time of the flexible impellers was shortened by about 28%.%结合酸-碱可视化技术和Matlab软件,分别计算出流体的混合时间数（无因次混合时间）Ntm和流体混合隔离区的面积覆盖率,对比分析传统桨与柔性桨的混合性能的差异。结果表明,在Ntm=10 800时,传统桨形成的混合隔离区的面积覆盖率在40%-50%之间,几小时之后（Ntm=25 000）仍稳定地存在;而柔性桨所形成的混合隔离区在Ntm=18 000时,混合隔离区在1%左右,且Ntm=25 000时,混合隔离区完全消失了;相对于传统桨,柔性桨使流体的混合时间降低了28%左右。
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