A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

Czasopismo Techniczne ◽

10.37705/techtrans/e2020009 ◽

2020 ◽

pp. 1-14

Author(s):

Marcin Augustyn

Keyword(s):

Boundary Layer ◽

Wind Turbine ◽

Vertical Axis ◽

Computational Procedure ◽

Horizontal Axis ◽

The Self ◽

Main Rotor ◽

Aerodynamic Coefficients ◽

Horizontal Axis Wind Turbine ◽

Design Structure

The proposed self-adjusting mechanism consists of a carousel rotor with a vertical axis consisting of two kinematically connected flat blades. The torque of this rotor can change the position of the directing unit and additionally the position of the main propeller in order to direct the wind stream or save the main rotor when the wind is too strong. The theory, principles of operation, and the properties of the self-adjusting system were illustrated by formulas and graphs. Based on research conducted in a boundary layer wind tunnel, the values of the aerodynamic coefficients of the flat blades were determined, and then the power and propeller torque of the rotor were found as a function of the angle of wind attack. A computational procedure provides kinematical and force relations as well as the resulting torque diagrams of the rotor. An example of the use and the design structure of a self-adjusting unit in the case of a horizontal axis wind turbine is presented.

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Comparison of horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT)

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i4.13.21333 ◽

2018 ◽

Vol 7 (4.13) ◽

pp. 74 ◽

Cited By ~ 9

Author(s):

Muhd Khudri Johari ◽

Muhammad Azim A Jalil ◽

Mohammad Faizal Mohd Shariff

Keyword(s):

Wind Turbine ◽

Wind Turbines ◽

Vertical Axis ◽

Green Technology ◽

Horizontal Axis ◽

Vertical Axis Wind Turbine ◽

Horizontal Axis Wind Turbine ◽

Current Output ◽

Voltage Output ◽

And Performance

As the demand for green technology is rising rapidly worldwide, it is important that Malaysian researchers take advantage of Malaysia’s windy climates and areas to initiate more power generation projects using wind. The main objectives of this study are to build a functional wind turbine and to compare the performance of two types of design for wind turbine under different speeds and behaviours of the wind. A three-blade horizontal axis wind turbine (HAWT) and a Darrieus-type vertical axis wind turbine (VAWT) have been designed with CATIA software and constructed using a 3D-printing method. Both wind turbines have undergone series of tests before the voltage and current output from the wind turbines are collected. The result of the test is used to compare the performance of both wind turbines that will imply which design has the best efficiency and performance for Malaysia’s tropical climate. While HAWT can generate higher voltage (up to 8.99 V at one point), it decreases back to 0 V when the wind angle changes. VAWT, however, can generate lower voltage (1.4 V) but changes in the wind angle does not affect its voltage output at all. The analysis has proven that VAWT is significantly more efficient to be built and utilized for Malaysia’s tropical and windy climates. This is also an initiative project to gauge the possibility of building wind turbines, which could be built on the extensive and windy areas surrounding Malaysian airports.

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Research on the Door Buckling Strength of Turbine Tower of HAWTs

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.268-270.1239 ◽

2012 ◽

Vol 268-270 ◽

pp. 1239-1243

Author(s):

Kai Long ◽

Ji Xiu Wu

Keyword(s):

Wind Turbine ◽

Large Scale ◽

Horizontal Axis ◽

Engineering Method ◽

Fe Model ◽

Horizontal Axis Wind Turbine ◽

Buckling Modes ◽

Buckling Strength ◽

Design Structure ◽

Wind Turbine Tower

In order to realize the buckling strength design for the opening door of the large-scale horizontal axis wind turbine tower, the method combined with the engineering method and the FEM was presented. The FE model of the door was established. The first-order buckling eigenvalues and buckling modes for three different structures were calculated and analyzed. Based on engineering method, the stress and buckling strength for the sections of tubular tower were obtained. Corrected by FEM results, the tower door with opening buckling strength were checked by engineering method. The results were compared with those by FEM. The safe design structure anti-buckling were presented. The method presented in this paper is feasible and effective for the opening door design in large-scale horizontal axis wind turbine tower.

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PENGARUH JUMLAH BLADE DAN VARIASI PANJANG CHORD TERHADAP PERFORMANSI TURBIN ANGIN SUMBU HORIZONTAL (TASH)

Dinamika Teknik Mesin ◽

10.29303/d.v4i2.60 ◽

2014 ◽

Vol 4 (2) ◽

Author(s):

I Kade Wiratama ◽

Made Mara ◽

L. Edsona Furqan Prina

Keyword(s):

Wind Turbine ◽

Energy Use ◽

Electrical Energy ◽

Vertical Axis ◽

Energy System ◽

Horizontal Axis ◽

Power Coefficient ◽

Speed Ratio ◽

Vertical Axis Wind Turbine ◽

Horizontal Axis Wind Turbine

The willingness of electrical energy is one energy system has a very important role in the economic development of a country's survival. As one energy source (wind) can be converted into electrical energy with the use of a horizontal axis wind turbine. Wind Energy Conversion Systems (WECS) that we know are two wind turbines in general, ie the horizontal axis wind turbine and vertical axis wind turbine is one type of renewable energy use wind as an energy generator. The purpose of this study was to determine the effect of the number of blade and the radius chord of rotation (n), Torque (T), Turbine Power (P), Power Coefficient (CP) and Tip Speed Ratio (λ) generated by the horizontal axis wind turbine with form linear taper. The results show that by at the maximum radius of the chord R3 the number blade 4 is at rotation = 302.700 rpm, Pturbine = 7.765 watt, Torque = 0.245 Nm, λ = 3.168 and Cp = 0.403 or 40.3%.

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