METHOD OF DESIGN AND GEOMETRICAL TRANSFORMATION OF HIGHSPEED AMPHIBIOUS VEHICLE AIRFOILS

The development of methods for determining the geometric parameters of the shape and design of the lifting surfaces of high-speed amphibious vessels using the positive influence of the ground effect is an inportant task on the way to creating new models of this type of transport – in particular, intended for operation in the North, in conditions of possible icing, which affects both the characteristics of lift and drag, and the characteristics of longitudinal static stability of cruising motion. At present, there are no clearly algorithmic methods for designing an aerodynamic profile of a screen wing according to the specified characteristics of the lifting properties and the characteristics of stability in conditions of flow around a viscous turbulent flow. The objective of this work is to develop such a method using digital modeling technologies of screen aerodynamics based on the numerical solution of the Reynolds-averaged Navier–Stokes equations using the control volume method. The profile construction technique is based on the approach developed by the author to the geometric transformation of the coordinates of the aerodynamic profile reference points, based on the approximation of the curved line of the upper arc. As a result of testing the developed methodology during computational experiments with the developed digital model of constructing and flowing around an airfoil near a movable screen, it was shown that shifting the maximum thickness of the airfoil is an effective tool for changing the position of the aerodynamic focus in height, which, in turn, is a control parameter for ensuring the stability of cruising flight at the design stage of a high-speed amphibious vessel.