Results 271 to 280 of about 372,323 (311)

Maximum wind turbine performance at low tip speed ratio

Journal of Renewable and Sustainable Energy, 2015
Wind turbines can approach the Betz-Joukowsky limit on maximum power only at sufficiently high tip speed ratio: in practice, for ratios in excess of about seven. This paper analyses the performance of a turbine with an infinite number of blades as the tip speed ratio decreases to zero, beginning with the two traditional ways of determining the maximum ...
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Simulation method of semi-physical wind power generation based on combined wind speed and tip speed ratio

2020 Chinese Automation Congress (CAC), 2020
In order to research wind power generation technology in the laboratory, a feasible scheme based on modeling and simulation was proposed to simulate wind turbines operating characteristics. The characteristics of wind turbine and the method of optimum leaf tip speed ratio are analyzed, the wind turbine simulation model is constructed, the wind speed ...
Xin Liu, Qijie Zhao, Jianxia Lu
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Ideal wind turbine performance at very low tip speed ratio

Journal of Renewable and Sustainable Energy, 2014
At very low tip speed ratios, wind turbine rotors behave similarly to stationary wings for which the well-known lifting line analysis gives the optimal loading. Lifting line analysis is applied to a stationary rotor of N blades for N = 1, 2, and 4.
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Study of Tip Flows in High Hub-to-Tip Ratio Axial Compressors at Low Speed With Varying Tip Gaps, Inflow Conditions and Tip Shapes

Volume 7: Turbomachinery, Parts A, B, and C, 2010
The present study involves simulation of a single compressor rotor with a high hub-to-tip ratio blade. The study includes the effect of variation of tip gap, of tip shapes and of inlet axial velocity profiles, with inflows simulated similar to that of a typical rear stage environment of a multi-stage axial compressor. Numerical studies were carried out
Bhaskar Roy, A. M. Pradeep, A. Suzith, Dinesh Bhatia, Aditya Mulmule   +4 more
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Effects of tip speed ratio on wind turbine wake meandering

Journal of Fluid Mechanics
This study utilises large-eddy simulation with the actuator line model to examine the effects of the tip speed ratio (TSR) on the wake-meandering characteristics of a wind turbine in uniform and turbulent inflows. It is shown that as the TSR grows, the onset position of the wake meandering moves closer to the rotor, and the magnitude of wake ...
Yan Wang, Guihua Zhao, Guoliang Liu, Yongze Zhou, Mingwei Ge, Zhen Ouyang, Zijing Ding, Ruifeng Hu   +7 more
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Fuzzy logic based optimal tip speed ratio MPPT controller for grid connected WECS

Materials Today: Proceedings, 2021
Abstract This paper proposes a fuzzy logic based optimal tip speed ratio controlled maximum power point tracking for grid connected variable speed wind energy conversion system. The general system includes a three bladed fixed pitch turbine, permanent magnet synchronous generator (PMSG), three phase uncontrolled rectifier, DC boost chopper, PWM ...
P. Sathish Babu, C.K. Sundarabalan, C. Balasundar, T. Santhana Krishnan   +3 more
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Tip speed ratio and Pitch angle control based on ANN for putting variable speed WTG on MPP

2016 Eighteenth International Middle East Power Systems Conference (MEPCON), 2016
The control of a variable-speed wind turbine below the rated wind speed is achieved by controlling the generator. The main goal is to maximize the wind power capture at variable wind speed which can be achieved by adjusting the turbine speed in such a way that the optimal tip speed ratio λ opt is maintained. For higher than rated wind speeds but below
Hassan H. El-Tamaly, Ayman Yousef Nassef
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Experimental and Numerical Studies of a High Solidity, Low Tip Speed Ratio DAWT

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010
A numerical and experimental investigation of a Diffuser Augmented Wind Turbine (DAWT) has been conducted. Historically, the advantages of DAWT concept have been negated by higher material cost and less than stellar real world performance. The current configuration combines a duct augmentation concept with an optimized, high solidity, twisted flat ...
Michael Moeller, Kenneth Visser
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The velocity of the tip vortex of a horizontal-axis wind turbine at high tip speed ratio

Renewable Energy, 1998
An equation is derived for the streamwise velocity of the tip vortex of a horizontal-axis wind turbine as the pitch of the vortex tends to zero. The equation is applicable at high tip speed ratios provided the vortex core remains of constant size and there is no flow along the vortex axis.
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Performance and Loads of Variable Tip Speed Rotorcraft at High Advance Ratios

2015
This dissertation presents a lifting-line, comprehensive approach to predicting the performance and loads of high advance ratio rotorcraft. At high advance ratios, the reverse flow region is large and its unique aerodynamics impacts the rotor performance and dynamics more than at conventional airspeeds where they are often ignored.
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