Abstract
In order to study the influence of the circumferential position of the balance hole on the cavitation performance of the semiopen impeller centrifugal pump, a low specific speed semiopen impeller centrifugal pump is taken as the object, and 4 kinds of circumferential positions of balance holes are designed. The SST k-ω turbulence model and the Rayleigh–Plesset cavitation bubble dynamics equation are used to calculate the full flow field of the centrifugal pump. Research shows that, under cavitation conditions, as the circumferential position of the balance hole is farther away from the blade working surface, the cavitation performance of the pump is reduced, and the larger θ (the angle of the balance hole and the leading edge of the blade in the direction of rotation) is, the easier the jet cavitation occurs near the balance hole. On the other hand, with the development of cavitation, the axial force of the impeller has also changed greatly. In contrast, the farther the balance hole is arranged in the circumferential direction (i.e., the greater θ), the more limited is the ability of the balance hole to balance the axial force.
Highlights
Due to the simple processing, easy replacement, and cleaning of semiopen impeller centrifugal pumps, they are often used in the petrochemical industry, agricultural production, fire protection, and other fields and are involved in the aerospace field. e semiopen impeller is different from the closed impeller
Zhang et al [7] have shown that, under the condition of a small flow rate, leakage vortex cavitation occurs in the tip gap, and the cavitation is seriously deteriorated
Li et al [8] used a highspeed digital camera to photograph the tip clearance cavitation flow of an axial flow pump at the flow rate of the best efficiency point. e evolution of the cavitation region and Mathematical Problems in Engineering the formation of cavitation bubbles were tracked, which provided an effective reference for the tip clearance cavitation region and the development process of an axial flow pump
Summary
Due to the simple processing, easy replacement, and cleaning of semiopen impeller centrifugal pumps, they are often used in the petrochemical industry, agricultural production, fire protection, and other fields and are involved in the aerospace field. e semiopen impeller is different from the closed impeller. In the study of the influence of balance hole diameter on the cavitation performance of low specific speed centrifugal pumps, Zhao et al [12] et al found that for low specific speed centrifugal pumps, when the specific area (the ratio of the total area of the balance hole to the flow cross section area of the rear ring) of the balance hole is between 2.5 and 4.5, the anticavitation ability of pump and the effect of balancing the axial force are the best. By changing the position of the balance hole, the influence of the circumferential position of the balance hole on the cavitation performance of the semiopen impeller centrifugal pump was studied. On this basis, the variation law of the axial force of the centrifugal pump with different balance hole positions was studied
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