The power consumption in stirred tanks is a key parameter to determine the efficiency of a rotating impeller. This parameter is highly related to the viscous forces of the working fluid, especially when a complex non-Newtonian behavior exhibits. From this basis, an attempt is made in this paper to reduce the power requirements of Scaba 6SRGT impellers for stirring viscoplastic fluids in cylindrical unbaffled vessels. For this purpose, perforations are created in each blade of the impeller. Effects of the perforation diameter (d_p/h = 0, 0.04, 0.07, 0.10 and 0.13), perforation shape (circular, lozenge, rectangular and triangular shapes) and number of perforation (n_b = 0, 2, 4, 6, and 9) on the hydrodynamics induced and power consumption are investigated. The obtained results revealed an interesting decrease in power numbers by using the perforation technique. When changing the perforation diameter from 0 to 0.13 and the number of perforations from 0 to 9, Np is reduced by about 3.7 %–21.6 % and 2.6–6.7 %, respectively. In a comparison between the different shapes of perforation, the circular shape has allowed a reduction by about 3.8 % less than that for the other cases, which had almost the same power requirements.

搅拌槽中的功率消耗是确定旋转叶轮效率的关键参数。该参数与工作流体的粘性力高度相关，尤其是在表现出复杂的非牛顿行为时。在此基础上，本文尝试降低Scaba 6SRGT叶轮的功率要求，以搅拌圆柱形无挡板容器中的粘塑性流体。为此目的，在叶轮的每个叶片中形成穿孔。穿孔直径（d _p / h = 0、0.04、0.07、0.10和0.13），穿孔形状（圆形，菱形，矩形和三角形）和穿孔数量（n _b= 0、2、4、6和9）的水动力特性和功耗进行了研究。获得的结果表明，通过使用穿孔技术，功率数显着降低。将射孔直径从0更改为0.13，将射孔数从0更改为9时，Np分别减少了约3.7％–21.6％和2.6–6.7％。在不同形状的穿孔之间进行比较时，圆形形状的功率降低比其他情况下的功率降低了约3.8％，其他情况下功率要求几乎相同。