通过分形叶轮降低搅拌容器的能耗
Reduced energy consumption in stirred vessels by means of fractal impellers
摘要：
早期的研究表明，当用分形叶片代替常规叶片时，无挡板搅拌容器的功率消耗显著降低。在本文中，这种减少的物理解释进行了研究，使用直接数值模拟在Re=1600。分形叶片周边周围的间隙产生射流，这些射流穿透尾流中的回流区，并将尾涡分解成较小的涡。这会影响吸入侧的时间平均再循环模式。分离区的体积在分形叶片的尾流中减小了7%。分形叶轮的较低扭矩相当于角动量的运输减少;这种差异源于较小的尾涡引起的湍流运输减少。湍流耗散的主要差异出现在尾涡附近，这是由于在相对较低的频率下速度梯度的波动。
英文摘要：
Earlier studies have shown that the power consumption of an unbaffled stirred vessel decreases significantly when the regular blades are replaced by fractal ones. In this paper, the physical explanation for this reduction is investigated using Direct Numerical Simulations at Re=1600. The gaps around the fractal blade perimeter create jets that penetrate inside the recirculation zone in the wake and break up the trailing vortices into smaller ones. This affects the time-average recirculation pattern on the suction side. The volume of the separation region is 7% smaller in the wake of the fractal blades. The lower torque of the fractal impeller is equivalent to a decreased transport of angular momentum; this difference stems from the reduced turbulent transport induced by the smaller trailing vortices. The major difference in the turbulent dissipation is seen in the vicinity of trailing vortices, due to fluctuations of velocity gradients at relatively low frequencies.
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