ОЦІНКА ЕФЕКТИВНОСТІ ФОРМ КРИЛА ВАЖКИХ ЛІТАКІВ НА ОСНОВІ ЇХ КОЕФІЦІЄНТА ЕЛІПТИЧНОСТІ

Abstract

The most important step in the choice of the parameters of trapezoidal wings is to ensure the design of the change in the circulation on their scope, as close as possible to the distribution of circulation in the elliptic wing as possible, which leads to the minimum value of its inductive resistance at a given value of the lift.Recently, when solving such a problem, the method of forming the main geometric sizes of the wing was distributed in terms of the equality of the so-called forms of trapezoidal () and equal to the elliptic area () wings.This approach turned out to be quite effective in the formation of geometric parameters of the wings of light and medium aircraft.However, for heavy aircraft with a large area of the wing, the plan of which is formed by three and more trapezes, there were difficulties in determining the coefficients of forms, which required the specified models for determining the coefficients of ellipticity () in assessing the effectiveness of heavy aircraft wings with their multivariate modification changes.The use of a refined model of the ellipticity coefficient is made on the examples of evaluating the effectiveness of trapezoidal wings of such heavy aircraft as IL-86, C-5A, IL-76 and An-124-100. It has been established that the wings of IL-76 and C-5A airplanes are the highest ellipticity. An-124-100 domestic aircraft wing is somewhat inferior to them in the magnitude of the ellipticity coefficient, which should be borne in mind when developing subsequent modifications of this aircraft.