In order to reveal the effect of the blades normal vibration on flow turbulence in the stirred vessel, we designed three kinds of blades: the flexible, flat‐rigid and curved‐rigid blades. The flow fields produced by the impellers with these three kinds of blades were measured by two‐dimensional particle image velocimetry. The results showed that the calculated turbulent kinetic energy (TKE) based on the pseudo‐isotropic assumption is slightly higher than that by the three fluctuating velocities for the flexible and curved‐rigid impellers, and the difference between above two calculations is smaller for the former impeller. For the flexible blades, the trailing vortices slightly move outwards in radial direction than those for the curved‐rigid blades, enhancing TKE transport from the blade to the bulk region of the vessel. For the flexible impeller, the phase‐averaged TKE differs slightly from that for the flat‐rigid impeller, but is higher than that for the curved‐rigid impeller. © 2018 American Institute of Chemical Engineers AIChE J, 64: 4148–4161, 2018

中文翻译：

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带有挠性叶片的叶轮搅拌的搅拌容器中的湍流场

为了揭示叶片正常振动对搅拌容器中流动湍流的影响，我们设计了三种叶片：柔性叶片，平刚性叶片和弯曲刚性叶片。用二维粒子图像测速仪测量了由这三种叶片产生的叶轮的流场。结果表明，基于拟各向同性假设的湍流动能（TKE）略高于挠性和弯曲刚性叶轮的三个脉动速度，而前者的上述两种计算之间的差较小叶轮。对于挠性叶片，尾部涡流在径向上比弯曲刚性叶片略微向外移动，从而增强了从叶片到容器大部分区域的TKE传输。对于挠性叶轮，平均相位的TKE与平刚性叶轮略有不同，但高于弯曲刚性叶轮。©2018美国化学工程师学会AIChE J，64：4148–4161，2018