Airfoil profile parametric modeling method

A parametric modeling and parametric model technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve numerically unstable abnormal airfoils, supercritical airfoil trailing edge description is not very accurate, etc. problems, to the effect of providing accuracy and reliability

Active Publication Date: 2015-03-04
CHINA AIRPLANT STRENGTH RES INST
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AI Technical Summary

Problems solved by technology

The first is that the description of the trailing edge of the supercritical airfoil is not very accurate, and the second is that numerical instability is prone to abnormal airfoils

Method used

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  • Airfoil profile parametric modeling method
  • Airfoil profile parametric modeling method
  • Airfoil profile parametric modeling method

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Embodiment Construction

[0021] Below by embodiment the present invention will be further described:

[0022] PARSEC airfoil parameterization scheme see figure 1 , see the parameterization scheme of Bezier curve airfoil figure 2 , the airfoil parametric modeling method of the present invention is to establish the relationship between the Bezier curve and the aerodynamic characteristics of the airfoil, and introduce the leading edge radius r in the PARSEC method le , the upper vertex coordinates (X up ,Z up ), the upper vertex curvature (Z XXup ), the lower vertex coordinates (X lo ,Z lo ), the lower vertex curvature (Z XXlo ), trailing edge angle α TE , trailing edge angle β TE , trailing edge thickness ΔZ TE , trailing edge height (Z TE ) controls the shape of the airfoil. figure 2 , the upper and lower airfoil curves consist of six control points P 0 ,P 1 , P 2 , P 3 , P 4 ,P 5 ,P 6 The generated two third-order Bezier curves are composed. In order to distinguish the upper and lo...

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Abstract

The invention belongs to aerodynamic configuration design technologies for aerocrafts and particularly relates to an airfoil profile parametric modeling method for the aerocraft. According to the airfoil profile parametric modeling method disclosed by the invention, the relationship between a Bezier curve and aerodynamic characteristics of the airfoil profile is established; an airfoil profile parametric model is constructed by adopting a four-section and three-order Bezier curve, so that the characteristics of the Bezier curve and PARSEC are integrated; the aerodynamic characteristic correlation of the PARSEC method is retained, and the stability and the universality of the Bezier method are realized, so that the accuracy and the reliability of an airfoil profile model of the aerocraft are effectively provided. The airfoil profile parametric modeling method disclosed by the invention is simple in programming; the generation speed of a new airfoil profile is higher; the airfoil profile parametric modeling method can be applied to the optimized design of the aerodynamic configuration of the airfoil profile and the airfoils and provides a powerful tool for the airfoil type design of the aerocraft.

Description

technical field [0001] The invention belongs to the aerodynamic shape design technology of an aircraft, in particular to a parametric modeling method for an airfoil of an aircraft. Background technique [0002] Aviation aircraft airfoil design has always been a difficult point in aircraft aerodynamic shape design. With the continuous development of modern computer technology, more and more CAD-based mathematical modeling methods are used in aircraft airfoil design. [0003] The Bezier curve is a parametric curve widely used in CAD, FEA, CFD and other fields. It is a common method used in the field of computer graphics to describe complex shapes. Venkataraman first introduced the Bezier curve to the parameters of the airfoil Later, this airfoil parameterization method based on computer graphics has been more and more in-depth research in the optimal design of airfoil and airfoil surface. The biggest feature of the Bezier curve parametric airfoil is that it can be seamlessly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李军鹏
Owner CHINA AIRPLANT STRENGTH RES INST
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