An Experimental and Numerical Study of Tip Vortex Cavitation

Szantyr, Jan; Flaszyński, Paweł; Tesch, K.; Suchecki, W.; Alabrudziński, Sławomir

doi:10.2478/v10012-011-0021-z

Cited by 13 publications

(7 citation statements)

References 2 publications

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“…Wu et al [50] simulated the unsteady cavitation turbulent flow in a Francis turbine using the RANS method and the improved mixture model of two-phase flows. Necker and Aschenbrenner [51] calculated a two-phase flow including cavitation model in a horizontal shaft bulb turbine, and Szantyr et al [52] analyzed the tip vortex cavitation with experimental and numerical methods. All of their work got good results in validation of the CFD approach compared with the experimental data.…”

Section: Cavitation Research By Cfdmentioning

confidence: 99%

A selected literature review of efficiency improvements in hydraulic turbines

Liu

Luo

Karney

et al. 2015

Renewable and Sustainable Energy Reviews

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Section: Cavitation Research By Cfdmentioning

confidence: 99%

A selected literature review of efficiency improvements in hydraulic turbines

Liu

Luo

Karney

et al. 2015

Renewable and Sustainable Energy Reviews

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“…In general, each model has its own advantages, but no universal model has been suggested. Readers may refer to References [29][30][31][32] for more details. To study the TLV cavitation around the same hydrofoil, a rotation-curvature-corrected SST model is applied in the numerical calculation, and results show that this model increases the prediction accuracy for cavitation patterns at large tip clearances [33].…”

Section: Comparison and Validation Of Numerical Methodsmentioning

confidence: 99%

“…On the basis of the shear stress transport (SST) k-ω model, Decaix et al [29] validated the tip-vortex trajectory using RANS (see Figure 13). Szantyr et al [30] compared four turbulence models (i.e., standard k-ε, renormalization group (RNG) k-ε, SST k-ω, and Reynolds stress model) with the measurement. They concluded that RNG k-ε is the best for simulating the tip-vortex cavitation, and SST k-ω is optimal under the noncavitation condition [27].…”

Section: Comparison and Validation Of Numerical Methodsmentioning

confidence: 99%

A Review of Tip Clearance in Propeller, Pump and Turbine

2018

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Propellers, pumps, and turbines are widely applied in marine equipment, water systems, and hydropower stations. With the increasing demand for energy conservation and environmental protection, the high efficiency and the stable operation of pumps and turbine have been drawing great attention in recent decades. However, the tip clearance between the rotating impeller and the stationary shroud can induce leakage flow and interact with the main stream, introducing complex vortex structures. Consequently, the energy performance and the operation stability of pumps and turbines deteriorate considerably. Constant efforts are exerted to investigate the flow mechanism of tip-clearance flow and its induced influence on performance. However, due to various pump and turbine types and the complexity of tip-clearance flow, previous works are usually focused on a specific issue. Therefore, a systematic review that synthesizes the related research is necessary and meaningful. This review investigates related research in the recent two decades in the perspectives from fundamental physics to engineering applications. Results reveal the vortex types, trajectory, evolution, and cavitation behaviors induced by tip-clearance flow. It is concluded that the influence characteristics of tip clearance on energy performance are closely related to the machinery type. Tip-clearance size and tip shape are found to be crucial parameters for tip-leakage vortex (TLV). The proposed optimization schemes are also demonstrated to provide inspiration for future research. Overall, this review article provides a coherent insight into the characteristics of tip-clearance flow and the associated engineering-design applications. On the basis of these understandings, comments on conducted research and ideas on future research are proposed.

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“…The avoidance of cavitation is a part of CFD-based design of modern rotary hydraulic machines like pumps, turbines and ship propulsors; the aim is to eliminate cavitation-induced hazards taking into account cavitation erosion, efficiency decrease as well as vibration and noise. One of the most intensive and dangerous forms of cavitation is the vortex cavitation that accompanies the operation of hydraulic machines in which components comprised of rotating blades (hydrofoils) are applied (Szantyr et al, 2011). As a result of liquid flow relative to the hydrofoil, a pressure distribution is generated.…”

Section: Introductionmentioning

confidence: 99%

Studies on Velocity Fields Around the Cavitation Vortices Generated by the Model of a Rotating Blade

Suchecki

2018

Polish Maritime Research

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The elimination of hazards caused by cavitation phenomena is an important issue to be considered in the design of process equipment including flow machinery. These hazards are: cavitation erosion, efficiency decrease as well as vibration and noise. One of the most intensive and dangerous forms of cavitation is vortex cavitation that accompanies the operation of hydraulic machines in which components comprised of rotating blades are applied. Velocity fields around cavitation vortices generated by the model of a propeller blade were experimentally studied in a cavitation tunnel. Flow images were recorded using a high-speed camera and processed using particle image velocimetry (PIV) complemented with computer-aided techniques that had been developed for the purpose of this research. These techniques included the removal of image distortions on the basis of a calibration mask, determination of instantaneous velocity distributions and removal of air-bubble traces from flow images. Experimental studies result examples were presented in the form of velocity fields determined in the longitudinal plane as well as in three transverse planes remote from the blade. Instabilities of the cavitating vortex stream and of the local liquid-flow velocity in its surrounding were detected. The effect of the angle of attack of propeller blade on the instability of the vortex stream and the effect of the presence of the cavitating vortex kernel on the local velocities of the surrounding liquid, were determined.

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An Experimental and Numerical Study of Tip Vortex Cavitation

Abstract: ABSTRACT

Cited by 13 publications

References 2 publications

A selected literature review of efficiency improvements in hydraulic turbines

A selected literature review of efficiency improvements in hydraulic turbines

A Review of Tip Clearance in Propeller, Pump and Turbine

Studies on Velocity Fields Around the Cavitation Vortices Generated by the Model of a Rotating Blade

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