Double-circle method for generating trailing edge flap control surface airfoil leading edge curve

Abstract

The invention aims to overcome defects in the prior art, be adapted to practical requirements, improve the trailing edge flap airfoil curve quality, increase the number of control points of a trailing edge flap control surface airfoil leading edge curve and reduce the construction quality so as to improve the curve quality of the trailing edge flap airfoil leading edge. A double-circle method comprises step one, retaining two points of c1 and c2 in the leading edge curve intersecting an aircraft airfoil and a chord length control point c2; step two, selecting a random control point c7 at the highest point of the maximum thickness at the aircraft leading edge or the highest point of the maximum thickness close to the aircraft leading edge; and step three, fitting the four points smoothly successively, and using a first curvature circle and a second curvature circle for controlling curvature at the control points c2 and c7 respectively to obtain a smooth curve. According to the double-circle method, the flap leading edge curve molding scheme is simple in operation and feasible, and a flap curved surface required by aerodynamic force can be designed through computer-aided design software.

Description

technical field [0001] The invention relates to the field of aircraft design, and in particular discloses a double-circle method for generating leading edge curves of trailing edge flap rudder surfaces. Background technique [0002] A trailing edge flap is a moving control surface on an aircraft wing. The shape of the trailing edge flap is controlled by the airfoil curve of the airfoil, figure 1 Shows the outline of the trailing edge flap, 1 is the trailing edge flap, 2 is the aircraft wing, the direction indicated by the arrow is the flight direction of the aircraft, and the position of the solid line of the trailing edge flap in the figure is the position when it is retracted , the dotted line shows the open position of the trailing edge flap. [0003] The parameterization of the theoretical shape of the trailing edge flap rudder surface is a very important part of the aircraft shape design, and the airfoil curve control generates the theoretical shape of the rudder surf...

AI Technical Summary

Problems solved by technology

[0006] However, the curvature reversal of the curve constructed by multiple points (≥3) is serious, the quality of the curve is not good, and it is difficult to correct the curve by changing the coordinates of the control points, and the operability is very poor

The method given in the aviation standard is relatively difficult in actual engineering operation, the operation is cumbersome, and the quality of the constructed curve is not good

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