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用CFD软件模拟了3种传统径向流搅拌桨—平直叶式、半圆管式和非对称抛物线式搅拌桨的功率消耗和泵送能力等搅拌性能,研究了不同桨叶结构和尺寸对搅拌桨功率准数和泵送能力的影响,设计扇环抛物面桨叶结构,比较了新型桨与传统桨的功率准数、泵送效率等搅拌性能和轴向投影面积率的差异.结果表明,桨叶外缘顶点曲率增大可减小功率准数和提高泵送效率,轴向高度减小可使功率准数降低但对泵送效率提升不大.基于空间自由曲面设计的带有新型非对称扇环抛物面桨叶的搅拌桨操作性能最佳,比非对称抛物线式搅拌桨功率准数下降30.8%,泵送效率提高22.6%.新型搅拌桨轴向投影面积率比非对称抛物线式搅拌桨增加21.5%,能用于气液分散操作.
The CFD software was used to simulate the stirring performance of three kinds of traditional radial flow impellers, such as flat blade, semicircular tube and asymmetric parabolic impeller. The effects of different blade structure and size on agitation Propeller power quasi and pumping capacity, the fan blade parabolic blade structure is designed, and the difference between the stirring performance and the axial projection area ratio of the new propeller and the traditional propeller is compared.The results show that the propeller Increasing the curvature of the outer edge of the outer edge of the blade can reduce the power quasi-number and improve the pumping efficiency. The reduction of the axial height can reduce the power quasi-number but does not improve the pumping efficiency. Based on the space-free surface design with a new asymmetry The parabolic fan impeller has the best operation performance, which is 30.8% less than that of asymmetric parabolic impellers and the pumping efficiency is increased by 22.6%. The axial projection area ratio of the new propeller is higher than that of asymmetric parabolic impellers 21.5%, can be used for gas-liquid dispersion operation.