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| Effect of screw centrifugal inducer on mechanical characteristics of vortex pump |
| QUAN Hui1,2*, CHENG Jing1, PENG Guoyi2 |
| 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. College of Enginee-ring, Nihon University, Kiriyama 963-8642, Japan |
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Abstract In order to optimize the ability of the vortex pump to transport complex medium and solid phase particle fluid and improve the efficiency of solid-liquid two-phase flow, the screw centrifugal inducer with guiding and propelling function was added in front of the impeller. Through the numerical calculation and test of 150WX-200-20 vortex pump, the performance change of vortex pump with and without inducer was obtained. On this basis, the mechanical characteristics of vortex pump and flow characteristics were combined to analyze the influence of screw centrifugal inducer on the mechanical characteristics of vortex pump. The results show that the fluid movement pattern in the bladeless cavity changes under the action of the inducer, generating vortices, secondary flows and other phenomena, intensifying the intensity of pressure pulsation, but the amplitude of pressure pulsation tends to decrease. The pressure pulsation intensity in the volute is not only related to the relative position of the monitoring point and the tongue, but also related to the cross section area of the flow surface where the monitoring point is.When the section area of the monitoring point can ensure that the fluid is constrai-ned by the volute and the fluid flow is more uniform, the pressure pulsation of the monitoring point is smaller. The addition of inducer will make the impeller fluid from the axial movement to radial movement, so as to weaken the size of the axial force. And meanwhile, the asymmetric structure of single blade inducer will aggravate the fluctuation. This research is of great significance to understanding the change of pressure pulsation in the vortex pump, weakening the axial force and improve the running stability of the pump.
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Received: 18 November 2019
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