Darrieus wind turbine

Summary

The Darrieus wind turbine is a type of vertical axis wind turbine (VAWT) used to generate electricity from wind energy. The turbine consists of a number of curved aerofoil blades mounted on a rotating shaft or framework. The curvature of the blades allows the blade to be stressed only in tension at high rotating speeds. There are several closely related wind turbines that use straight blades. This design of the turbine was patented by Georges Jean Marie Darrieus, a French aeronautical engineer; filing for the patent was October 1, 1926. There are major difficulties in protecting the Darrieus turbine from extreme wind conditions and in making it self-starting. Method of operation In the original versions of the Darrieus design, the aerofoils are arranged so that they are symmetrical and have zero rigging angle, that is, the angle that the aerofoils are set relative to the structure on which they are mounted. This arrangement is equally effective no matter which direction

Official source

https://en.wikipedia.org/wiki/Darrieus_wind_turbine

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Heat Transfer Characteristics of High Crossflow Impingement Channels: Effect of Number of Holes

Santiago Llucià, Peter Ott, Alexandros Terzis

In modern turbine airfoils, narrow impingement cooling channels can be formed in a double-wall configuration. In these wall-integrated cooling cavities, the generated crossflow is one of the most important design factors, and hence, the number of impingement holes included in the channel. This study examines experimentally the influence of the number of impingement holes on the heat transfer characteristics of narrow impingement channels. The channels consist of two rows of jets where the number of holes in the axial direction is varied from 5 to 10, maintaining the same plate open area. Local heat transfer coefficient distributions are obtained for all channel interior walls using the transient liquid crystal technique and over a range of Reynolds number (20'300-41'000). The results show an important heat transfer degradation at higher open areas and a small influence of the number of holes at upstream channel positions.

2015

Experimental Aeroelastic Analysis of Clustered Turbine Blades Vibrating in Mixed Torsion/Bending Mode

Peter Ott, Achim Zanker

This paper presents and discusses unsteady experimental results of controlled vibration measurements of blade-cluster and single-blade test cases, all subjected to the same subsonic ow conditions. The experiments were performed in a non-rotating annular test facility with the aim to investigate the influence of cluster vibrations on the aerodynamic damping of turbine rotor blades. A frequently-used blade package type was selected: a two-blade-cluster in mixed mode, combing in a alternating manner a bending and a torsion vibration mode. In addition, single-blade test cases were investigated serving as reference for the cluster case. The actuation of the 20 turbine blades was obtained by an electro-magnetic excitation system, enabling individually the adjustment of vibration amplitude and phase for each blade at one vibration frequency. The unsteady measurements obtained include time-synchronous unsteady blade surface pressures and blade displacements resulting in local and global aerodynamic blade damping. A comparison of the cluster- and the single-blade-test cases was performed and differences were identified and analyzed.

The American Institute of Aeronautics and Astronautics2013

2013