Numerical investigations of hydrodynamic performance of hydrofoils with leading-edge protuberances
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- Chang Cai
- State Key Laboratory of Hydro Science and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing, China
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- Zhigang Zuo
- State Key Laboratory of Hydro Science and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing, China
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- Shuhong Liu
- State Key Laboratory of Hydro Science and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing, China
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- Yulin Wu
- State Key Laboratory of Hydro Science and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing, China
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説明
<jats:p> Leading-edge protuberances on airfoils or hydrofoils have been considered as a viable passive method for flow separation control recently. In this article, the hydrodynamic performance of a NACA 63<jats:sub>4</jats:sub>-021 (baseline) foil and two modified foils with leading-edge protuberances was numerically investigated using the Spalart–Allmaras turbulence model. It was found that modified foils performed worse than the baseline foil at pre-stall angles, while the lift coefficients at high angles of attack of the modified foils were increased. Both the deterioration of pre-stall and the improvement of post-stall performance were enhanced with larger amplitude of protuberance. Near-wall flow visualizations showed that the leading-edge protuberances worked in pairs at high angles of attack, producing different forms of streamwise vortices. An attached flow along some valley sections was observed, leading to a higher local lift coefficient at post-stall angles. The leading-edge protuberances were considered as sharing a similar mechanism as delta wings, increasing nonlinear lift at large angles of attack. The specific stall characteristics of this leading-edge modification could provide some guidelines for the design of some special hydrofoils or airfoils. </jats:p>
収録刊行物
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- Advances in Mechanical Engineering
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Advances in Mechanical Engineering 7 (7), 2015-07-01
SAGE Publications
