Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (4): 781-793.doi: 10.1016/j.cjche.2018.10.020

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

Torque and bending moment acting on a flexible shaft agitated by disk turbines in a gas-liquid stirred vessel

Yangyang Liang1, Zhengming Gao1, Dai'en Shi2, Haotian Li1, Yuyun Bao1, Ziqi Cai1   

  1. 1 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    2 Mechanical Engineering School, Yancheng Institute of Technology, Yancheng 224051, China
  • Received:2018-05-16 Revised:2018-10-10 Online:2019-04-28 Published:2019-06-14
  • Contact: Zhengming Gao, Ziqi Cai;
  • Supported by:
    Supported by the National Key R&D Program of China (2017YFB0306704) and the National Natural Science Foundation of China (21676007).

Abstract: The torque and bending moment acting on a flexible overhung shaft in a gas-liquid stirred vessel agitated by a Rushton turbine and three different curved-blade disk turbines (half circular blades disk turbine, half elliptical blades disk turbine, and parabolic blades disk turbine) were experimentally measured by a customized moment sensor. The results show that the amplitude distribution of torque can be fitted by a symmetric bimodal distribution for disk turbines, and generally the distribution is more dispersive as the blade curvature or the gas flow rate increases. The amplitude distribution of shaft bending moment can be fitted by an asymmetric Weibull distribution for disk turbines. The relative shaft bending moment manifests a "rising-falling-rising" trend over the gas flow number, which is a corporate contribution of the unstable gas-liquid flow around the impeller, the gas cavities behind the blades, and the direct impact of gas on the impeller. And the "falling" stage is greater and lasts wider over the gas flow number for Rushton turbine than for the curved-blade disk turbines.

Key words: Shaft bending moment, Torque, Disk turbines, Gas-liquid flow, Fluid structure interaction