Experimental Testing of the Transverse Horizontal Axis Water

Experimental Testing of the Transverse crosswise Axis piss Turbine
R.A. McAdam1, G.T. Houlsby, M.L.G. Oldfield and M.D. McCulloch
University of Oxford, Department of Engineering Science, OX1 3PJ Email: ross.mcadam@eng.ox.ac.uk
1

Abstract
This paper outlines the procedures and preliminary results for a set of experiments on the Transverse Horizontal Axis water system Turbine (THAWT), which is a variant of a Darrieus turbine. Testing of a 1/20th scale contrivance was conducted in the combined wind, ripple and current tank at Newcastle University. Flow depth and f weigh were varied over a spew of realistic Froude numbers for tidal streams. Various configurations of the device were tested to assess the merits of the THAWT design. Variants include a parallel bladed device, a truss device and a parallel bladed device configured with blades fling relative to the pitch circle tangent. Experiments were carried out using a speed controlled motor, allowing quasi-steady results to be taken over a range of tip speed ratios. Preliminary results demonstrate that, over a range of flow conditions, the device is capable of exceeding the Lanchester-Betz make up ones mind for kinetic efficiency. This is principally due to the relatively high obstruction ratio which can be achieved with such a device.




Keywords: Darrieus, Horizontal axis, THAWT, Tidal stream

1 Introduction
The rapid development of devices for tidal vitality exploitation is being encouraged by government initiatives and by private investment. The horizontal axis, axial flow turbine is the most honey oil design of a tidal stream turbine. A number of variants of this type of device, which incorporate features such as flowguiding shrouds or peculiar(prenominal) mounting techniques, have been proposed by different developers, but the underlying hydrodynamics remain similar for these devices. However, a drawback with such designs is that their coat cannot be increased significantly, because of the limited depth of flow at most sites. It would be more...If you want to get a beat essay, order it on our website: Orderessay



If you want to get a full essay, wisit our page: write my essay .