Abstract
The CQU-DTU-LN1 series of airfoils were designed with an objective of high lift and low noise emission. In the design process, the aerodynamic performance is obtained using XFOIL while noise emission is obtained with the BPM model. In this paper we present some validations of the designed CQU-DTU-LN118 airfoil by using wind tunnel measurements in the acoustic wind tunnel located at Virginia Tech and numerical computations with the inhouse Q3uic and EllipSys 2D/3D codes. To show the superiority of the new airfoils, comparisons with a NACA64618 airfoil are made. For the aerodynamic features, the designed Cl and Cl/Cd agrees well with the experiment and are in general higher than those of the NACA airfoil. For the acoustic features, the noise emission of the LN118 airfoil is compared with the acoustic measurements and that of the NACA airfoil. Comparisons show that the BPM model can predict correctly the noise changes.
Highlights
Design of wind turbine airfoils is a basic but important task for designing wind turbine rotors
In this paper we present some validations of the designed Chong Qing University (CQU)-DTU-LN118 airfoil by using wind tunnel measurements in the acoustic wind tunnel located at Virginia Tech and numerical computations with the inhouse Q3uic and EllipSys 2D/3D codes
The noise emission of the LN118 airfoil is compared with the acoustic measurements and that of the NACA airfoil
Summary
Design of wind turbine airfoils is a basic but important task for designing wind turbine rotors. Employing an efficient airfoil with a high lift coefficient and a high lift-to-drag ratio can reduce the cost of wind turbine blades, and reduce the cost of energy. Noise from wind turbines can give annoyance to the people living nearby which becomes a barrier for further developments of wind energy. Designing highly efficient wind turbines, and at the same time reducing its noise emission are the design goals of future wind turbines. The design of wind turbine airfoils was started in the 1970's and some pioneering works were carried out on designing wind turbine airfoils such as the Wortmann FX 77-W-series airfoils [1] and the NREL airfoils [2]. Björk [3], Timmer and van Rooij [4], Fuglsang and Bak [5] made some significant contributions in designing the wind turbine airfoils named with their institution’s names (FFA, DU and RISØ airfoils)
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