How oblique trailing edge of a hydrofoil reduces the vortex-induced vibration

Zobeiri, Amirreza; Ausoni, Philippe; Avellan, François; Farhat, Mohamed

doi:10.1016/j.jfluidstructs.2011.12.003

Cited by 71 publications

(33 citation statements)

References 34 publications

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“…Zobeiri et al [19] focused on the VIV of the hydrofoil with oblique trailing edge at high Reynolds number, and concluded that the collision between upper and lower vortices and the resulting vorticity redistribution are the main reasons of the vibration reduction. Yao et al [20] carried out a research on the effect of trailing edge shape on hydrodynamic damping for a hydrofoil.…”

Section: Introductionmentioning

confidence: 99%

An Intelligent Optimization Method for Vortex-Induced Vibration Reducing and Performance Improving in a Large Francis Turbine

et al. 2017

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Abstract:In this paper, a new methodology is proposed to reduce the vortex-induced vibration (VIV) and improve the performance of the stay vane in a 200-MW Francis turbine. The process can be divided into two parts. Firstly, a diagnosis method for stay vane vibration based on field experiments and a finite element method (FEM) is presented. It is found that the resonance between the Kármán vortex and the stay vane is the main cause for the undesired vibration. Then, we focus on establishing an intelligent optimization model of the stay vane's trailing edge profile. To this end, an approach combining factorial experiments, extreme learning machine (ELM) and particle swarm optimization (PSO) is implemented. Three kinds of improved profiles of the stay vane are proposed and compared. Finally, the profile with a Donaldson trailing edge is adopted as the best solution for the stay vane, and verifications such as computational fluid dynamics (CFD) simulations, structural analysis and fatigue analysis are performed to validate the optimized geometry.

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Section: Introductionmentioning

confidence: 99%

An Intelligent Optimization Method for Vortex-Induced Vibration Reducing and Performance Improving in a Large Francis Turbine

et al. 2017

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“…The results displayed an asymmetric wake beyond 271 beveled trailing edge and Von Kàrman street vortices beyond 601 beveled trailing edge. In a well detailed experiment, Zobeiri et al (2012) has shown how a simple 301 oblique truncation of a hydrofoil trailing edge may significantly reduce the vibration without alteration of hydrodynamic performances. They clearly observed that the oblique truncation generates a phase shift between upper and lower vortices and leads to their "collision" and partial cancellation.…”

Section: Introductionmentioning

confidence: 99%

Effect of trailing edge shape on hydrodynamic damping for a hydrofoil

Yao

Wang

Dreyer

et al. 2014

Journal of Fluids and Structures

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a b s t r a c tFlow induced vibration on a hydrofoil may be significantly reduced with a slight modification of the trailing edge without alteration of the hydrodynamic performance. Particularly, the so called Donaldson trailing edge shape gave remarkable results and is being used in a variety of industrial applications. Nevertheless, the physics behind vibration reduction is still not understood. In the present study, we have investigated the hydrodynamic damping of a 2D hydrofoil with Donaldson trailing edge shape. The results are compared with the same hydrofoil with blunt trailing edge. The tests are carried out in EPFL high speed cavitation tunnel and two piezoelectric patches are used for the hydrofoil excitation in non-intrusive way. It was found that the hydrodynamic damping is significantly increased with the Donaldson cut. Besides, as the flow velocity is increased, the hydrodynamic damping is found to remain almost constant up to the hydrofoil resonance and then increases linearly, for both tested trailing edge shapes and for both first bending and torsion modes.

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“…This hydrofoil has the same cross-section as the experimental model used by Ausoni et al [9], Ausoni [10], and Zobeiri et al [11]. Ten percent of the original chord was removed from the trailing-edge region of the NACA 0009 hydrofoil.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Interestingly, it has been reported that cavitation has a minor effect on the wake dynamic. Recently, Zobeiri et al [11] investigated two NACA 0009 hydrofoils with blunt and oblique trailing edges, respectively, for Reynolds numbers ranging from 5.0 × 10 5 to 2.9 × 10 6 and conducted high-speed visualization and flow-induced vibration measurements. They confirmed experimentally that flow-induced vibration was significantly reduced with an oblique trailing edge compared with a truncated edge.…”

Section: Introductionmentioning

confidence: 99%

“…With these numerical schemes, we numerically investigate vortex shedding from various beveled trailing edges of a NACA 0009 hydrofoil at a Reynolds number of 10 6 . We then compare our numerical results with experimental data [10,11] to assess the capability of our numerical methodology. In addition, we investigate the influence of periodically varying free-stream flows on vortex shedding to better understand the vortex shedding mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Vortex Shedding from a Hydrofoil with a Beveled Trailing Edge

Lee

Suh

2015

Modelling and Simulation in Engineering

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To better understand the vortex shedding mechanism and to assess the capability of our numerical methodology, we conducted numerical investigations of vortex shedding from truncated and oblique trailing edges of a modified NACA 0009 hydrofoil. The hybrid particle-mesh method and the vorticity-based subgrid scale model were employed to simulate these turbulent wake flows. The hybrid particle-mesh method combines the vortex-in-cell and the penalization methods. We have implemented numerical schemes to more efficiently use available computational resources. In this study, we numerically investigated vortex shedding from various beveled trailing edges at a Reynolds number of 10 6 . We then compared the numerical results with the experimental data, which show good agreement. We also conducted numerical simulations of wakes behind the hydrofoil at rest in periodically varying flows. Results reveal that vortex shedding is affected by the periodicity of a free-stream flow, as well as the trailing-edge shape.

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How oblique trailing edge of a hydrofoil reduces the vortex-induced vibration

Cited by 71 publications

References 34 publications

An Intelligent Optimization Method for Vortex-Induced Vibration Reducing and Performance Improving in a Large Francis Turbine

An Intelligent Optimization Method for Vortex-Induced Vibration Reducing and Performance Improving in a Large Francis Turbine

Effect of trailing edge shape on hydrodynamic damping for a hydrofoil

Numerical Investigation on Vortex Shedding from a Hydrofoil with a Beveled Trailing Edge

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