We investigated the flow characteristics in a tank of H /T = 1.5 stirred by a novel multi‐blade combined agitator (MBC) by using time‐resolved particle image velocimetry and large eddy simulation approach. The predictions were assessed by Y ⁺ values, Taylor microscale and power spectrum analysis, as well as experimental validation of velocity distributions. Results demonstrate that the MBC agitator can load the energy into the system effectively with a power number of 12.5 in a turbulent regime, resulting in improved axial and radial mass exchange. The upper and lower short blades produce an axial down‐flow in the top half and an axial up‐flow in the bottom half, respectively. Part of axial flows change to radial flows by the radial pumping of the long blades, meanwhile, the impingement of two axial flows improves the axial mass exchange. These flow characteristics lead to an obvious improvement in the turbulent kinetic energy distribution uniformity with higher turbulent intensity.

中文翻译：

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时间分辨粒子图像测速和大涡模拟研究新型多叶片混合搅拌器的流动特性

我们使用时间分辨粒子图像测速和大涡模拟方法研究了H / T = 1.5的水箱中的流动特性，该水箱由新型多叶片联合搅拌器（MBC）搅拌。预测由Y ⁺评估值，泰勒微尺度和功率谱分析，以及速度分布的实验验证。结果表明，MBC搅拌器可以在湍流状态下以12.5的功率有效地将能量加载到系统中，从而改善了轴向和径向质量交换。上部和下部短叶片分别在上半部产生轴向向下流动，在下半部产生轴向向上流动。通过长叶片的径向泵送，部分轴向流变为径向流，同时，两个轴向流的碰撞改善了轴向质量交换。这些流动特性导致湍流动能分布均匀性明显提高，湍流强度更高。