Influence of interference of the wing and fuselage on aerodynamic characteristics

Abstract

In this paper, a change in the aerodynamic characteristics of the aircraft layout with a wing and a fuselage depending on the position of the fuselage relative to the wing is studied. A simulation of the flow of calculation models with different positions and the angle of the wing with respect to the fuselage is performed. The aerodynamic characteristics have been obtained, the analysis of the change of bearing properties and the criteria of the efficiency of the layout has been made, the maximum peaks of aerodynamic perfection of K have been determined. For constructive considerations, the most acceptable variant of the layout with the angle of the 8 ° wing and the wing of Y KP equal to the wing chord b is determined. The lifting power of the calculation model for different values of φ KR and Ykr is practically unchanged. The value of the Суа α ≈ 0.083 derivative in comparison with the characteristics of the isolated wing remains unchanged, which confirms the absence of interference effects on the load-carrying properties of the layout. The value of the aerodynamic perfection of the calculation models depends greatly on the values of φ KR and Ykr. Decreasing Ykr for a given value of the Суа coefficient, it significantly reduces the value of aerodynamic perfection to the layout, which clearly demonstrates the effect of interference on the level of frontal resistance. It is proved that physically, the cause of the fall in the maximum value of K is not just the increase in the resistance of the interference, but the decrease of the lift force due to the presence of a significant discharging area on the lower surface of the wing caused by the dispersal of the flow around the surface of the fuselage and the corresponding decrease in the value of total pressure in the flow between the wing and the fuselage. It has also been proved that the existence of such correlations of the angle of the φKr installation and the excess Ykr of the wing, in which the interference is positive and the maximum value of the aerodynamic quality of the lay-outs, increases. The main results are presented in graphical form for all combinations.