Large-thickness blunt-trailing-edge wind-power airfoil profiles and a design method thereof

Abstract

The invention discloses a group of large-thickness blunt-trailing-edge wind-power airfoil profiles and a design method thereof. The airfoil profiles have high lift coefficients under operation angles of attack. The airfoil profile group includes four airfoil profiles with relative thicknesses of 45%, 50%, 55% and 60% in sequence and with trailing edge thicknesses of 7%, 9%, 12% and 16% in sequence. Variable working condition design is adopted by the airfoil profile group, design Reynolds numbers of the four airfoil profiles are 4.0*106, 3.5*106, 3.0*106 and 2.5*106 in sequence according to the relative thicknesses, and the design objective mainly aims to take stability, changed along with the Reynolds numbers, of the lift coefficients as main constraint according to change features of the lifting coefficients within the range of large angles of attack in vane root areas. Numerical prediction results indicate that when the four large-thickness blunt-trailing-edge airfoil profiles are in the range of large angles of attack, the lift coefficients ascend continuously and stably and are in a high level. By the airfoil profile group, vane structural strength and stiffness can be improved, and a wind turbine can have high-efficient and stable output.

Description

technical field [0001] The invention belongs to the field of horizontal axis wind turbine airfoil design, and in particular relates to a family of thick airfoil profiles suitable for the root of large horizontal axis wind turbine blades and a design method thereof. Background technique [0002] The development of a special airfoil family for wind turbines with excellent performance is the key to improving the energy capture rate of horizontal axis wind turbine blades, and the research and development goals of wind turbine airfoils are closely related to the development needs of wind turbines. In recent years, China's wind power industry has developed rapidly. Wind farms of various sizes have been established in different regions. The capacity of newly installed wind turbines has continued to increase, and the blade size has become significantly longer. [0003] First of all, different wind resource environments have different requirements for wind turbine blades. The vast a...

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Problems solved by technology

Moreover, the design Reynolds number of the existing thick airfoil is single; the design angle of attack is small, which is far lower than the range of the angle of attack of the airfoil in the root region when the wind turbine is running; the lift coefficient stalls sharply, and is smaller at a large angle of attack

These deficiencies are not conducive to improving the wind energy capture rate of large wind turbines

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