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Effect Of Bracket Holder On Down-wind Coning Rotor In Double .pdf

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					                          Effect Of Bracket Holder On Down-wind Coning Rotor                                                                          In
 PO.ID
                                                                                                                                                                           FU
                                       Double-wire Suspension Turbine
 PO.335
                                                                                  T. EZAKI,
                                             Engineering Graphic Lab., Fukuoka University ,!9-1,Nanakuma,Jonanku,Fukuoka,Japan
                                                  Tel:+81-02-871-6631 ext.6562, Fax:+81-92-865-6031,tezaki@fukuoka-u.ac.jp


                                                                                     Abstract

A small wind turbine suspended by a pair of wires strung between mountains makes it possible to set a higher altitude than that of a tower-installed turbine and to use
multiple wind layers in space. By assembling an array of such small wind turbines, we can expect to produce a large amount of electricity. The author designed a yaw
bracket holder, installed in front of the rotor, that performs a fin function. In this paper, the author presents the test results for a new wind turbine that was designed to
overcome the problems inherent in wire-suspension.


                                                                                    Methods


 The wind turbine is suspended with a 25-m-long wire cable of 6-mm diameter, with both sides are drawn by a winch. The cable is strung between
 two towers on hills, at an altitude of approximately 80m in the NNW direction. The figure shows the designed fin bracket for a double-wire
 suspended wind turbine that has the following functions related to performance; 1) Fin function at cut-in wind speed for a down-wind turbine with a
 thin -blade rotor; 2) A wind-concentration function; 3) Reduction of vortex flow behind the yaw supporter; 4) Prevention of brad damage from
 sudden changes in wind direction by gusts. As an additional feature, the wind turbine is positioned down-wind of six blades with an initial coning
 angle of 15 degrees as shown in the figure. The blade and generator used to model the proposed wind turbine are commercially available parts.
 Rotor radius is 0.75m, and the blades are molded carbon fiberglass. The generator is 750 W-DC. Suspended weight is approximately 15 Kg.




                                                                                  Conclusions


         The author designed a yaw fin bracket holder and tested it. The results showed a significant difference from
         previous models through a comparison test. In particular, the following advantages were achieved.
         1. Easy yawing and starting at low wind speed
         2. Prevention of blade damage from gusts
         3. High performance at low wind speeds by wind-concentrating effect of fin bracket


                                                                                   References



         1. H. MATSUMIYA,Y. TSUTSUI, and Y. KUMEOKA, Optimum Shapes for The Tail-Wings of Wind Turbines. The Japan Society of Mechanical Engineers (B), Vol.51-470, 1985.
         2. K. Kwaguchi, D. Kanemaru, M. Tomioka , F. Tanaka , Study on Improvement of Darrieus 、Wind Turbine with Straight Blades (1st Report: Effect of Airfoil Shape and Chip
           Speed Ratio) , Turbo machinery Society of Japan.
         3. T. Ezaki, GEOMETORY-BASED GRAFICAL ANALYSIS OF WIND TURBINE PHENOME- NA , 2008 EWEC, 2008.




                             European Wind Energy Conference & Exhibition 2010, Tuesday 20 - Friday 23 April 2010, Warsaw, Poland

				
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