Aerodynamic characteristics of perforated aircraft flight controls at subsonic flow velocities

Abstract

The vortex separation from the aircraft control surfaces often leads to undesirable shaking and pitch of the structure. One way to eliminate this effect is to perforate surfaces. The paper considers the aerodynamic characteristics of the aircraft flight control element in the form of a single elongation perforated flat plate. Experimental studies were carried out in a subsonic wind tunnel of Bauman Moscow State Technical University. The aerodynamic coefficients of plates with different degrees of perforation 0...28.3% were obtained at free stream velocities of 15.. 35 m/s in a wide range of angles of attack from 0 to 90 degrees. The graphs of the aerodynamic coefficients of the plates versus the angle of attack were analyzed. Findings of the research show that the aerodynamic characteristics of perforated plates differ from the corresponding characteristics of solid plates, an increase in the degree of perforation leads to a decrease in the values of aerodynamic coefficients, while a decrease in the free flow velocity causes their increase.