Simulating variable pitch crossflow water turbines: A coupled unsteady ONERA-EDLIN model and streamtube model

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• 作者：B. Paillard ; ^{ben.paillard@gmail.com} ; F. Hauville ^{frederic.hauville@ecole-navale.fr} ; J.A. Astolfi ^{jacques-andre.astolfi@ecole-navale.fr}
• 关键词：Darrieus ; Variable pitch ; Dynamic stall ; Momentum theory
• 刊名：Renewable Energy
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：52
• 期：Complete
• 页码：209-217
• 全文大小：822 K

文摘

This article describes a new method for simulating unsteady hydrodynamics forces and moments on the blades of a crossflow ¡®Darrieus¡¯ turbine with active pitch variation. This method is based on the ONERA-EDLIN dynamic stall model, coupled with a momentum streamtube model to take into account the turbine interference on the flow. Both models are presented, and compared separately with experimental results for a pitching airfoil for the ONERA-EDLIN model; and for Darrieus turbine for the momentum theory. The model coupling is then detailed and compared with experimental data taken from the open literature The turbine has 2 straight blades with a NACA 0012 section operating in water at a mean chord Reynolds number of 4?¡Á?10⁴ for tip speed ratio ¦Ë?=?2.5, 5 and 7.5. Good agreement was found for average ¦Ë?=?5, and qualitative agreement could be obtained at low and high ¦Ë, where dynamic stall effects and interference effects respectively are predominant. This is positive because ¦Ë?=?5 is the closest value from the optimal power production point. Variable pitch is finally introduced in the model and several functions are tested in order to increase efficiency. A maximum increase of 53 % on the power coefficient was found to occur with a sinusoidal law.