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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TL;DR: In this paper, the effect of varying impeller geometrical parameters, including impeller type, number of impeller blades, blade pitch angle and blade thickness, on the turbulent velocity fields in mixing tanks has been studied through LDV measurements.
Abstract: The effect of varying impeller geometrical parameters, including impeller type, number of impeller blades, blade pitch angle and blade thickness, on the turbulent velocity fields in mixing tanks has been studied through LDV measurements. Pitch bladed turbines and disc turbines were used in the experiments. It was found that universal time-mean velocity profiles exist for both pitch bladed turbines and disc turbines. Flow number correlations based on power number for both pitch bladed turbines and disc turbines are presented. It was found that there is a link between impeller pumping capacity and the S parameter in the Zwietering correlation, and this can be expressed as NQ × S = K, where NQ is the impeller flow number and K is a non-dimensional constant independent of the solid/liquid material property and impeller geometry.
64 citations
TL;DR: A fault detection and diagnosis method to automatically identify different fault conditions of a hydraulic blade pitch system in a spar-type floating wind turbine and results from the final performance evaluation show that the proposed methods work effectively with good performance.
64 citations
Patent•
26 Apr 2006
TL;DR: In this article, an adaptive pitch angle adjustment for adjusting the pitch angle angle of a wind turbine is presented, and a control signal is generated based on the adapted pitch angle value and sent to blade actuators that act to change the pit angle of the wind turbine to the new or modified pitch angle setting.
Abstract: An adaptive for adjusting blade (312) pitch angle angle, and cotnrollers (350) implementing such method, for achieving higher pow coefficients. Average power coefficients are determined for first and second periods of operation for the wind tubine (310). When th average power coefficient for the second time period is larger than for the first, a pitch increment, which may generated based on th power coefficients, is added (or the sign is retained) to the nominal pitch angle value for the wind turbine (310). When the average power coefficient for the second time period is less than for the first, the pitch increment is subtracted (or the sign is changed). A control signal is generated based on the adapted pitch angle value and is sent to blade pitch actuators (318) that act to change the pit angle of the wind turbine (310) to the new or modified pitch angle setting, and this process is iteratively performed.
63 citations
TL;DR: A new pitch controller is proposed by employing partial offline quasi-min-max fuzzy model-predictive control to investigate the variable-speed wind turbine performance and the results show the superiority of the proposed controller over the gain scheduled-PI controller and two other advanced control techniques.
63 citations
Patent•
26 Apr 2005TL;DR: In this paper, a method for reducing load and providing yaw alignment in a wind turbine including measuring displacements or moments resulting from asymmetric loads on the wind turbine is proposed, and the pitch of each rotor blade is adjusted in accordance with the determined pitch to reduce or counter asymmetric rotor loading.
Abstract: A method for reducing load and providing yaw alignment in a wind turbine includes measuring displacements or moments resulting from asymmetric loads on the wind turbine. These measured displacements or moments are used to determine a pitch for each rotor blade to reduce or counter asymmetric rotor loading and a favorable yaw orientation to reduce pitch activity. Yaw alignment of the wind turbine is adjusted in accordance with the favorable yaw orientation and the pitch of each rotor blade is adjusted in accordance with the determined pitch to reduce or counter asymmetric rotor loading.
63 citations