This paper aims to numerically investigate the rotating cavitation pressure pulsation and propagation characteristics of a three-bladed submerged pump inducer.First,the external and cavitation characteristics of the i...This paper aims to numerically investigate the rotating cavitation pressure pulsation and propagation characteristics of a three-bladed submerged pump inducer.First,the external and cavitation characteristics of the inducer in a normal-temperature water medium are studied experimentally.The accuracy of the numerical calculation model is then verified using the experimental results.On the basis of the numerical calculations,the pressure pulsation and rotational cavitation characteristics of the inducer of the submersible pump are analyzed.The results show that as the cavitation number decreases,the cavitation area in the inducer expands and shifts backward,affecting the inducer’s performance.The pressure pulsation amplitude increases,the frequency domain characteristics change,and the main frequency shifts from three times the shaft frequency to the same as the shaft frequency.The development of the cavitation zone and interaction between adjacent blades are key factors for the occurrence of rotational cavitation.The development of the cavitation zone is closely related to changes in the liquid flow angle.展开更多
The rotating axisymmetric cavitator is widely applied in underwater vehicles, and its rotational motion affects the cavita- ting flow over the cavitator. This study focuses on the effect of rotation on the flow struct...The rotating axisymmetric cavitator is widely applied in underwater vehicles, and its rotational motion affects the cavita- ting flow over the cavitator. This study focuses on the effect of rotation on the flow structure in the cavity bubble. Unsteady 2-D/3-D numerical simulations of cavitating flows over axisymmetric cavitators are performed using the volume of fraction （VOF） method and the Sauer-Schnerr cavitation model. Firstly, the 2-D simulation of cavitating flow over a circular disk or a cone cavitator is carried out at various cavitation numbers （0.15, 0.175, 0.2, 0.225 and 0.25）. The simulated cavity lengths and drag coefficients are compared with the experimental data, the theoretical estimations and the published numerical results. Then the 3-D simulations of cavitating flows over the same axisymmetric cavitators with different rotating speeds are performed using the sliding mesh model （SMM）. The effect of rotation on the cavity shape and the internal flow structure is analyzed.展开更多
基金co-supported by the National Science Fund for Distinguished Young Scholars of China(Grant No.52425903)the International Science and Technology Cooperation Program of Jiangsu Province(Grant No.BZ2024027).
文摘This paper aims to numerically investigate the rotating cavitation pressure pulsation and propagation characteristics of a three-bladed submerged pump inducer.First,the external and cavitation characteristics of the inducer in a normal-temperature water medium are studied experimentally.The accuracy of the numerical calculation model is then verified using the experimental results.On the basis of the numerical calculations,the pressure pulsation and rotational cavitation characteristics of the inducer of the submersible pump are analyzed.The results show that as the cavitation number decreases,the cavitation area in the inducer expands and shifts backward,affecting the inducer’s performance.The pressure pulsation amplitude increases,the frequency domain characteristics change,and the main frequency shifts from three times the shaft frequency to the same as the shaft frequency.The development of the cavitation zone and interaction between adjacent blades are key factors for the occurrence of rotational cavitation.The development of the cavitation zone is closely related to changes in the liquid flow angle.
基金Project Supported by the Sepcial Research Program of Public Welfare and Capacity Building in Guangdong Province(Grant No.2015A020216008)
文摘The rotating axisymmetric cavitator is widely applied in underwater vehicles, and its rotational motion affects the cavita- ting flow over the cavitator. This study focuses on the effect of rotation on the flow structure in the cavity bubble. Unsteady 2-D/3-D numerical simulations of cavitating flows over axisymmetric cavitators are performed using the volume of fraction （VOF） method and the Sauer-Schnerr cavitation model. Firstly, the 2-D simulation of cavitating flow over a circular disk or a cone cavitator is carried out at various cavitation numbers （0.15, 0.175, 0.2, 0.225 and 0.25）. The simulated cavity lengths and drag coefficients are compared with the experimental data, the theoretical estimations and the published numerical results. Then the 3-D simulations of cavitating flows over the same axisymmetric cavitators with different rotating speeds are performed using the sliding mesh model （SMM）. The effect of rotation on the cavity shape and the internal flow structure is analyzed.
