METHOD OF EXPRESS-SELECTING THE PROFILES OF WING OF THE STRATOSPHERIC QUASI-SATELLITE
Keywords:quasi-satellite, profile aerodynamic quality, relative thickness profile, radius of the leading edge, complexity of technical reproduction of the profile contour, coefficient of lift, coefficient of aerodynamic resistance, angle of attack
The article deals with the method of selecting in the first approximation of a wing profile for a stratospheric quasi-satellite- a high-altitude solar-powered aircraft that has a "normal aerodynamic scheme".The peculiarities of this type of aircraft regarding the choice of a specific wing profile with maximum values of aerodynamic quality, which is the basis for obtaining high perfection of the future layout of the quasi-satellite, are noted. Examples of existing aircraft are given, the wing profiles of which can be analogues in this study. During the study, the method of direct placement of weight coefficients is used. Significant factors that influence the decision on the choice of profile are determined and their values are established. It is indicated that the maximum profile quality for a given Re number, among other things, has the highest weight coefficient. Instead, the maximum relative thickness, which was considered to be the determining factor, becomes the second most important factor, given the use of modern composites as a key technological tool. Even less important is the complexity of the technical reproduction of the profile contour. Based on the study, the geometric and aerodynamic characteristics of the FX 76 MP-120 profile for Re numbers within 0.2… 1x106 are presented.
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