Wind turbine airfoil design method combining B spline with curvature smooth continuity

Abstract

The present invention discloses a wind turbine airfoil design method combining a B spline with curvature smooth continuity, which considers the curvature smooth continuity of an airfoil profile surface and achieves airfoil profile control and parameter optimization under the condition of a multi-point design attack angle on the basis of establishing an airfoil B spline functional expression in the process of airfoil optimization design. According to the method provided by the present invention, in the continuously iterative optimization process of an airfoil, the characteristic of the curvature smooth continuity of the airfoil profile surface is constrained, so that the problem of no convergence of an aerodynamic force in the multi-point attack angle airfoil optimization design process can be well solved; the overall aerodynamic performance of the designed airfoil is significantly improved, so that the chord length of a blade is reduced, and a material required for the blade is lightened; due to the high overall aerodynamic performance, a wind turbine has a more wide applicable condition; and the method disclosed by the present invention can be popularized to design of wind turbine airfoils with various thicknesses, design of airplane airfoils and complete curve design of a turbine blade profile and the like, and has good societal value and economic benefits.

Description

technical field [0001] The invention relates to the technical field of airfoil design, in particular to a wind turbine airfoil design method under the condition of realizing multi-point design angle of attack by combining B-spline and curvature smooth continuity. Background technique [0002] At present, the commonly used wind turbine airfoils include NREL-S series airfoils, Danish RIS series airfoils, DU series airfoils in the Netherlands and FFA-W series airfoils in Sweden. These airfoil profile design methods, whether based on a specific airfoil profile or a function-based airfoil integrated mathematical model representation, are based on the single-point angle of attack (for example, the design angle of attack is 6°), On the basis of studying its geometric characteristics and aerodynamic characteristics, it is improved to obtain a blade airfoil with good performance. The design of wind turbine airfoil under the condition of multi-point angle of attack is not considere...

AI Technical Summary

Problems solved by technology

That is, in the process of airfoil optimization, the aerodynamic force of the designed airfoil converges at a certain angle of attack, but at another angle of attack, the aerodynamic force of the designed airfoil may not converge, so that the optimization program cannot continue

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