Topic
Blade pitch
About: Blade pitch is a research topic. Over the lifetime, 5321 publications have been published within this topic receiving 63134 citations.
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16 Oct 2008TL;DR: In this article, a wind turbine having at least one blade having adjustable pitch angle that is adjusted according to an operational parameter schedule is presented, where a minimum pitch angle is determined in response to a wind speed and a rotor speed.
Abstract: A method for operating a wind turbine. The method includes providing a wind turbine having at least one blade having adjustable pitch angle that is adjusted according to an operational parameter schedule. A blade efficiency parameter is determined in response to a wind speed and a rotor speed. A minimum pitch angle is determined in response to the blade efficiency parameter and the pitch angle of the at least one blade in response to the blade efficiency parameter is maintained to an angle equal to or greater than the minimum pitch angle independent of the operational parameter schedule. A wind turbine plant and a method for servicing a wind turbine are also disclosed.
34 citations
TL;DR: In this paper, an approach for the determination of aerodynamic performance characteristics of horizontal-axis wind turbines is presented, where the optimum angle of attack and optimum twist angle of a windmill blade are examined on the basis of elementary blade-element theory.
34 citations
TL;DR: In this article, a compact BEM (blade element momentum) analysis is derived to design optimal blades for continuously variable speed HAWTs, and the optimal blade geometry is obtained for which the maximum power coefficient is calculated at different design tip speed ratios and drag to lift ratios by assuming variable operational speed.
34 citations
07 Jan 2008
TL;DR: In this article, a set of variable pitch propellers were acquired in a wind tunnel and detailed geometric characteristics (pitch, chord, airfoil) of the propeller were measured.
Abstract: Limited data exists for propeller and wind turbine post stall aerodynamics. Post stall aerodynamics was observed in small propellers at low Reynolds numbers. First, performance data (thrust, power, and efficiency) for a set variable pitch propellers was acquired in a wind tunnel. The propellers were 6 to 9.9 inches in diameter and were able to pitch to extreme angles. Second detailed geometric characteristics (pitch, chord, airfoil) of the propellers were measured. Finally, PROPID with and without stall delay models was used to simulate the propellers and predict the performance. Comparing the experimental and calculated results identified regions where post stall aerodynamics affected propeller performance.
34 citations
16 Jun 2014
TL;DR: In this article, a pitch control linkage mechanism for vertical axis wind turbine is modeled by multi-body approach using MSC Software and an appropriate airfoil which works at low Reynolds number is selected for blade design.
Abstract: Awareness about wind energy is constantly growing in the world. Especially a demand for small scale wind turbine is increasing and various products are available in market. There are mainly two types of wind turbines, horizontal axis wind turbine and vertical axis wind turbines. Horizontal axis wind turbines are suitable for high wind speed whereas vertical axis wind turbines operate relatively low wind speed area. Vertical axis wind turbines are cost effective and simple in construction as compared to the horizontal axis wind turbine. However, vertical axis wind turbines have inherent problem of self-start inability and has low power coefficient as compare to the horizontal axis wind turbine. These two problems can be eliminated by incorporating the blade pitching mechanism. So, in this paper overview of various pitch control systems is discussed and design of self-acting pitch mechanism is given. A pitch control linkage mechanism for vertical axis wind turbine is modeled by multi-body approach using MSC Software. Aerodynamic loads are predicted from a mathematical model based on double multiple stream tube method. An appropriate airfoil which works at low Reynolds number is selected for blade design. It is also focused on commercialization of the vertical axis wind turbine which incorporates the self-acting pitch control system. These aerodynamic load model will be coupled with the multi-body model in future work for optimization of the pitch control linkage mechanism. A 500 Watt vertical axis wind turbine is designed and it is planned to implement the self-acting pitch control mechanism in real model.
34 citations