Airfoil Selection

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Michael S. Selig - One of the best experts on this subject based on the ideXlab platform.

  • Low Reynolds Number Airfoils for Small Horizontal Axis Wind Thrbines
    Wind Engineering, 1997
    Co-Authors: Philippe Giguere, Michael S. Selig
    Abstract:

    To facilitate the Airfoil Selection process for small horizontal-axis wind turbines, an extensive database of low Reynolds number Airfoils has been generated. The database, which consists of lift and drag data, was obtained from experiments conducted in the same wind tunnel testing facility. Experiments with simulated leading-edge roughness were also performed to model the effect of blade erosion and the accumulation of roughness elements, such as insect debris, on Airfoil performance. Based on the lift curves and drag polars, guidelines that should be useful in selecting appropriate Airfoils for particular blade designs are given. Some of these guidelines are also applicable to larger HAWTs.

Joseph Samuel Becar - One of the best experts on this subject based on the ideXlab platform.

  • A Collaborative Conceptual Aircraft Design Environment for the Design of Small-Scale UAVs in a Multi-University Setting
    53rd AIAA Aerospace Sciences Meeting, 2015
    Co-Authors: Joseph Samuel Becar
    Abstract:

    The development of a collaborative design tool for the generation and evaluation of small-scale electric-powered UAV concepts in a multi-university, multi-disciplinary setting is presented. The integrated design and optimization software CCADE (Collaborative Conceptual Aircraft Design Environment) enables the immersion of team members from different universities in a software environment which shares design information and analysis results in a central database. Input files for use by open-source analysis tools are automatically generated, and output files read in and displayed in a user-friendly graphical interface. Analysis codes for initial sizing, geometry, Airfoil Selection, aerodynamics, propulsion, stability and control, and structures are included. CCADE increased the volume of concepts which can be evaluated by student teams, increased the quality of designs produced, and contributed to shorter lead time to preliminary and detailed design.

Dhruv Suri - One of the best experts on this subject based on the ideXlab platform.

  • Design and Optimisation of a Low Reynolds Number Airfoil for Small Horizontal Axis Wind Turbines
    IOP Conference Series: Materials Science and Engineering, 2018
    Co-Authors: Jayakrishnan Radhakrishnan, Dhruv Suri
    Abstract:

    Horizontal axis wind turbines (HAWTs) are scaled down to incorporate rotor blades that usually have a diameter ranging from two to four meters in length. A common misconception with regard to Selection of Airfoils followed by subsequent designing of rotor blades involves the use of NACA Airfoils and other conventional high Reynolds number Airfoils. Micro horizontal axis wind turbines usually operate at low Reynolds number conditions along the blade length. Conventional aerodynamic schemes cannot be applied to rotor blades operating under low Reynolds number conditions as compared to those occurring under high Reynolds number conditions since certain unusual aerodynamic phenomena predominate in the case of the former. The efficiency of a wind turbine is largely dependent on blade optimization, which is why Airfoil Selection of the rotor blade is of considerable importance. The difference between high and low Reynolds number operation is the onset of boundary layer transition. In the case of high Reynolds number operation, as is the case of aircraft propellers and other high speed turbines, boundary layer transition takes place before laminar separation, which is in direct contrast to low Reynolds number boundary layer phenomena, wherein laminar separation takes place before boundary layer transition

Wu Guo - One of the best experts on this subject based on the ideXlab platform.

  • Airfoil Selection for a Lift Type Vertical Axis Wind Turbine
    Journal of Engineering Thermophysics, 2012
    Co-Authors: Sun Xiao, Lu Q, Huang Dian, Wu Guo
    Abstract:

    At present,there are many different types of Airfoils that have been used in lift-type vertical axis wind turbines.In order to study the influence of different Airfoils on the lift-type vertical axis wind turbine performance,two-dimensional numerical simulation of flow around a Darrieus-type straight-bladed vertical axis wind turbine was conducted in this paper with the aid of computational fluid dynamics software and sliding mesh method.Numerical results suggest that NACA0018 Airfoil is the most suitable Airfoil section used by a lift-type vertical axis wind turbine rotors as it can allow the wind turbine to achieve the highest wind energy utilization efficiency.

Kenneth D. Visser - One of the best experts on this subject based on the ideXlab platform.

  • The Impact of Airfoil Selection on the Design of Small Horizontal Axis Wind Turbines
    48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010
    Co-Authors: Benjamin Kanya, Kenneth D. Visser
    Abstract:

    Most small wind turbines are designed to maximize the power output at a given design tip speed ratio, TSR. Airfoils are then selected so as to achieve the maximum lift to drag ratio, L/D, over the given Reynolds number range. Allowing the Airfoil performance to be an independent variable in the design process, however, drives the design to a particular optimum operating conditions for the Airfoil selected. Numerical studies were performed using mRotor, a blade element momentum, BEM, code, to examine the impact of L/D on the optimum operating TSR condition. The results indicated that a configuration with an Airfoil having a high L/D operates better at a high TSR, however, an Airfoil with a low L/D was observed to perform better if operated at a low TSR. Results were compared to the National Renewable Energy Lab BEM code WT_Perf. The impact of hub size and the implications of the results on the design space are also discussed.