Experimental and Numerical Investigation on the Tip Leakage Vortex Cavitation in an Axial Flow Pump with Different Tip Clearances
Bin Xu,Xi Shen,Desheng Zhang,Weibin Zhang +3 more
- Vol. 7, Iss: 12, pp 935
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TLDR
In this article, a scaling axial flow pump with different sizes of tip clearances was employed to study the tip clearance effect on tip leakage vortex (TLV) characteristics, which is based on a modified turbulence model.Abstract:
The tip gap existing between the blade tip and casing can give rise to tip leakage flow and interfere with the main flow, which causes unstable flow characteristics and intricate vortex in the passage. Investigation on the tip clearance effect is of great important due to its extensive applications in the rotating component of pumps. In this study, a scaling axial flow pump used in a south-north water diversion project with different sizes of tip clearances was employed to study the tip clearance effect on tip leakage vortex (TLV) characteristics. This analysis is based on a modified turbulence model. Validations were carried out using a high-speed photography technique. The tip clearance effect on the generation and evolution of TLV was investigated through the mean velocity, pressure, and vorticity fields. Results show that there are two kinds of TLV structures in the tip region. Accompanied by tip clearance increasing, the viscous loss in the tip area of the axial flow pump increases. Furthermore, the tip clearance effect on pressure distribution in the blade passage is discussed. Beyond that, the tip clearance effect on vortex core pressure and cavitation is studied.read more
Citations
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Journal ArticleDOI
A review of cavitation in tip-leakage flow and its control
TL;DR: In this article, the authors reviewed the progress in the researches of the tip-leakage vortex (TLV) cavitation, including the numerical methods for the TLV cavitation and the flow characteristics.
Journal ArticleDOI
The Effect of Root Clearance on Mechanical Energy Dissipation for Axial Flow Pump Device Based on Entropy Production
TL;DR: In this article, the authors investigated the effect of root clearance on mechanical energy dissipation using numerical simulation and entropy production methods, and the numerical model was validated with an external characteristics test, and unsteady flow simulations were conducted on the axial flow pump under four different root clearance radii.
Journal ArticleDOI
Energy Characteristics of Full Tubular Pump Device with Different Backflow Clearances Based on Entropy Production
Fan Meng,Yanjun Li,Ji Pei +2 more
TL;DR: In this article, the entropy theory was used as the evaluation standard of energy dissipation, and the effect of backflow clearance on energy characteristics of a full tubular pump was investigated by 3D unsteady flow simulation.
Journal ArticleDOI
Research On the Influence of Impeller Tip Clearance On the Internal Flow Loss of Axial Circulating Pump Under Unpowered Driven Condition
TL;DR: Based on the entropy production theory, the energy loss characteristics of the axial flow pump with different tip tip clearance (TC) are studied, and it is concluded that increasing the TC increases the strength of tip leakage flow as discussed by the authors .
Journal ArticleDOI
Effect of Tip Clearance on Helico-Axial Flow Pump Performance at Off-Design Case
TL;DR: In this paper, the effect of tip clearance on the flow behaviors and pressurization performance of a helico-axial flow pump was analyzed using the standard k-e turbulence model.
References
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Journal ArticleDOI
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Numerical analysis of unsteady tip leakage vortex cavitation cloud and unstable suction-side-perpendicular cavitating vortices in an axial flow pump
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Journal ArticleDOI
The Internal Structure of the Tip Leakage Vortex Within the Rotor of an Axial Waterjet Pump
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