Many research works have been proposed so far for optimal design of WT blade to meet the desired performance characteristics. It is required to design parameters appropriately for a SWT to improve the efficiency and performance characteristics along with its associated control schemes. Arodynamic efficiency of WT-blades can be improved by making it efficient in extracting energy from the wind. Therefore, development of an effective WT under this condition requires careful selection of airfoil and effective design of blades, so that it could be able to successfully perform under various wind speeds even at low Reynolds number. Aerodynamic characteristics associated with low Reynolds number flow must be properly addressed, particularly in small WT under the low tip speed ratio at which the rotor blade may undergo flow separation and dynamic stall. In addition to this, Wind Turbine characteristics (power and torque coefficient) are largely dependent upon Reynolds number, which also varies with wind speed. As the result, it experiences low lift force and high drag force. Moreover, it has low inertia and large portion of it function under low Reynolds number ( Re) due to small diameter of rotor swept area and low wind velocity. On the contrary, Small WT (SWT) are frequently subjected to intermittent wind profile which is not usually beneficial to produce desired power. Large horizontal HAWT are often located in the areas where optimum wind condition is most likely to prevail. IEC 61400-2 defines the range for swept area of Small WT (SWT) to be less than 200 sq-m, corresponding to approximately less than 50 kW output power generation. Nowadays, small scale standalone Horizontal Axis Wind Turbines (HAWT) are being widely employed to produce the power for various places in remote communities, including off-grid residences, telecom towers, offshore platforms, schools, hospitals and similar others where grid is not accessible. Wind Turbine are mainly of two types (horizontal and vertical axis WT) and generally available in the range from a few Watts to several Megawatts. The amount of power generated relies on judicious selection and design of Wind Turbine blades. In most of the cases, it is widely used to generate electrical power by revolving Wind Turbine (WT) blades around its rotor axis. Wind as an alternative to fossil fuel, is one of the most available and exploitable form of energy. National Advisory Committee for AeronauticsĪngle of inclination/angle of relative wind This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The result obtained by the proposed procedure is simpler and more efficient than BEM theory – a method normally employed for blade design. Characteristics of the Wind Turbine obtained analytically from this procedure are compared with several other reported earlier in some of the literatures. Airfoil selection and design approach are intended to make Wind Turbine blade efficient specially under low range of AoA. Comparison between different types of airfoil has been made to figure out the most suitable one. Twist angle variation, chord length and other related parameters are determined with the help of program. Computational code has been written to find optimum blade profile. A procedure has been proposed to find the important parameters and analyze the performance characteristics for a three bladed HAWT operating under the wake rotation. This article deals with an airfoil based computational approach to design the blade for a standalone small scale Horizontal Axis Wind Turbine (HAWT). This makes the task even more difficult for designing and optimization of WT blades. Small scale Wind Turbines (SWT) normally operate in the low range of Angle of Attack ( AoA). * Corresponding author: utilization of wind energy depends on careful selection and suitable design of Wind Turbine (WT) blades. Katihar Engineering College, Katihar, Bihar 854109, India Madanapalle Institute of Technology & Science, Post-Angallu, Madanapalle 517325, Andhra Pradesh, India
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