Abstract
Vortex pumps have good non-clogging performance owing to their impellers being retracted into retraction cavities, but they are much less efficient than ordinary centrifugal pumps. In this paper, numerical simulations were performed on a model of the 150WX200-20 vortex pump for four different blade types, and the influence of blade structure on pump performance was determined. The simulations revealed the existence of axial vortices in the flow passage between the blades in the impeller region. The geometric characteristics of these axial vortices were more regular in two-phase solid-liquid flow than single-phase liquid flow. The presence of the solid phase reduced the vortex strength compared with the single-phase flow and suppressed the increase in size of the secondary circulation vortex. It was found, however, that the blade shape had a greater influence on the circulating flow than the presence of the solid phase. The flow state of the medium flowing out of the impeller domain had a direct effect on the circulating flow with this effect being related to the law governing the flow of the medium in the flow channel between the blades. It was found that the performance of a front-bent blade was the best and that of a curved blade the worst. This influence of blade type on the internal flow structure was used to further explain the relationship between the internal flow structure and the external characteristics of the vortex pump, the understanding of which is crucial for blade selection and hydraulic optimization.
Highlights
The operational stability of centrifugal pumps in liquid transportation is important because of their strong flow energy and pulsation [1,2]
The fluid flows through the bladeless cavity, enters the impeller, and flows out of the impeller region under the action of the impeller
Most of the solid particles conveyed by the fluid are energized in the circulating flow and flow out of the pump through the bladeless cavity and the diffusion section
Summary
The operational stability of centrifugal pumps in liquid transportation is important because of their strong flow energy and pulsation [1,2]. This outflowing fluid squeezes the circulating flow in the bladeless cavity to achieve fluid pumping This structure endows the vortex pump with the ability to handle fluids with larger particles and longer fibrous materials. It makes it more stable than ordinary centrifugal pumps during operation. Most of the solid particles conveyed by the fluid are energized in the circulating flow and flow out of the pump through the bladeless cavity and the diffusion section. The existence of the circulating flow means that the impeller has less contact with the solid phase than in a centrifugal pump, which gives a vortex pump better non-clogging performance and reduces wear on the impeller, greatly extending the service life of the pump [7,8]. UUnnddeerr ttwwoo‐-pphhaassee ffllooww ccoonnddiittiioonnss,, tthhee ssoolliidd aanndd lliiqquuiidd pphhaasseess mmoovvee aatt ddiiffffeerreenntt ffllooww tbrtarttrabtttefhwhheahhwofaaffaftteeeffuetesoesieeeoeecnesceis‐iccss-adnnpatdpftatdiilisfimtthnmnhnaneoeeofoatgocargrnetnetifsntnhsuohtstetteadaaaehnniheimlolmfiefldcepcflpfflfffoooooeapuelpueodwmom,rtw,emremwiiiweiororftbbtifnpfifpnpniiofineioifstnnstrbrierfbiataeakemaommkloyoldtntnrvnvddipdiaaatooooooosyenynlnswttnrprwscrypctottourteeoeneoopnuwiuwxcxmfffoeomtcttiischbcfpufphntanlplulaturtaougelegahhetrtamfapdmdeteetdnondoubeoepppifopislsmfwwtfa,t,fiaufuhfhmgedwwepamaamevenrrettuehohedevdesppd[nsnririro1ei.c.icttmtftfs9erhpTphfTbfbitbx,eueuhug2eehclcrlrsaxp0nemamoeeoettd]dunamnmdp.[dppbekem1cceuepepee9etttstsmpyhhln,lyitii2iiignagpencepcup0inkaoonanee]nmmtetr.srustoedoeyyonanaafsasfeslsdaaalmirtmttstsnnhcnheeetcutffrwuderdreoooolltttdtrodrutpphhwaicic-epenprerceepesosaahcth,,fhiiflcc‐oglawgwwapaottousnnsiishwhhwhcceeneaaappieitvcvclfllspnprrhohweoooeeoaarlrxxccwitihatfttstsetelppeeyeeoessaxaeecxinrrwssnlorlrnnp..sspiignlssoeeoTTaucudnnotyhoohmamahiccfifnetenmeeemippsrsrdogeoeost[[sainahf11fltlitjojiiosii77oesohsdodrr,,aorremne1‐1em-nrllf,88f,siietadaoqoqb]]bhtcac..ssuiuooetttcntAtAhotiootilladdhdyhyerrt‐tl
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