Numerical investigation of flow characteristics in twin-screw pump under cavitating conditions

10th International Conference on Compressors and their Systems

Yan, D.^1,2 ; Kovacevic, A.^2 ; Tang, Q.^1 ; Rane, S.^2

State Key Laboratory of Mechanical Transmission, Chongqing University, 400044, China^1

Centre for Compressor Technology, City University of London, EC1V0HB, United Kingdom^2

关键词: Calculation results;    Cavitation characteristics;    CFD (computational fluid dynamics);    Effects of rotation;    Flow charac-teristics;    Liquid-gas two-phase flow;    Numerical investigations;    VOF (volume of fluid) method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/232/1/012026/pdf
DOI  :  10.1088/1757-899X/232/1/012026

来源: IOP

【 摘 要 】

In order to investigate the flow characteristics and the formation process of cavitation in twin-screw pumps, three-dimensional CFD (Computational Fluid Dynamics) numerical analysis has been carried out. A conformal structured moving mesh generated by an in-house code SCORG was applied for the rotor domain. The VOF (Volume of Fluid) Method has been adopted for dealing with the liquid-gas two-phase flow, while the bubble dynamics was handled by a homogenous cavitation model. By changing the rotation speed and discharge pressure, the intensity, distribution area and variation of cavitation at different rotor angle were obtained. The effects of rotation speed and discharge pressure on cavitation characteristics have been analysed. Calculation results with cavitation model are compared with the results without cavitation and the experimentally obtained values. The influence of cavitation on the performance of a screw pump in terms of the mass flow rate, pressure distribution, rotor torque and the shaft power have been analysed and discussed.