Results 231 to 240 of about 75,283 (262)

Performance of a High Tip Speed Ratio H-Darrieus in the Skewed Flow on a Roof

41st Aerospace Sciences Meeting and Exhibit, 2003
Small wind turbines sited on a flat roof have good opportunities to become widespread. They operate in the accelerated wind above the roof and deliver the power where it is needed. Since the power produced offsets that which would otherwise be bought from the utility, they reduce energy demand and bills from the utility. Furthermore excess power can be
Sander Mertens, Gijs van Kuik, Gerard van Bussel   +2 more
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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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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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Evaluation of the MPPT performance in small wind turbines by estimating the tip-speed ratio

2013 48th International Universities' Power Engineering Conference (UPEC), 2013
In this paper, a method for online estimation of the tip speed ratio (TSR) of small wind turbines is presented, in order to evaluate the MPPT performance. Unlike obvious methods, for which an encoder or resolver is needed, the presented method only requires measurements of the wind speed and the generator current. Firstly, the accuracy of the presented
Louis F. M. Gevaert, Jeroen D. M. De Kooning, Tine L. Vandoorn, Jan Van de Vyver, Lieven Vandevelde   +4 more
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Achieving optimum tip-speed-ratio of a two-mass wind turbine system

2016 IEEE International Conference on Power and Energy (PECon), 2016
This paper proposes a three term PID controller to achieve optimum tip-speed ratio of a variable speed fixed pitch two-mass wind turbine system. The main advantage of the method is the functional simplicity and the robust performance in a wide range of operating condition.
Nor Syaza Farhana Mohamad Murad, Muhammad Nizam Kamarudin, Sahazati Md Rozali, Mohd Hendra Hairi   +3 more
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Cylindrical Vortex Model of a Rotor of Finite or Infinite Tip-Speed Ratios

2017
A simple vortex model of a rotor with infinite number of blades and constant circulation is presented in this chapter. The model consists of a root vortex, a right semi-infinite vortex cylinder of tangential and longitudinal vorticity, and a bound vortex disk (actuator disk) of radial vorticity. This model was briefly presented in Sect. 5.2.3 The model
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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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Tool-tip dynamics in micromachining with arbitrary tool geometries and the effect of spindle speed

International Journal of Machine Tools and Manufacture, 2023
Shivang Shekhar, Bekir Bediz, O Burak Ozdoganlar   +2 more
exaly  

515 The influence of tip speed ratio on a Savonius rotor wake

The Proceedings of Ibaraki District Conference, 2006
Hiroaki FUJISHIMA, Eizi KATO, Tsutomu TAGHIKAWA   +2 more
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Effect of tip-speed ratio on induced velocities near a lifting rotor

2017
A theoretical investigation of the asymmetry of induced flow in the vicinity of a lifting rotor in forward flight has been conducted. The analysis is based upon an asymmetric wake which is a logical extension of that used for previous investigations. Equations for the induced velocities at an arbitrary point in space are presented in a form suitable ...
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