Abstract: The interaction between vortices and the object surface exists in various situations. The vortex affect the pressure distribution of the surface and aerodynamic performances of aircraft. The pressure distribution of the aircraft can reflect the spatial flow characteristics of the vortices around the aircraft. Combined with the angle of attack, side slip angle and other flow parameters, the force state and motion trend of the aircraft can be judged. This paper, Vortex signature identification methods in surface pressure distributions is established according to the theory of point vortex and “mirror vortex”. The results show that the surface pressure distribution curve can characterize the spatial position (projection position and height of the vortex core distance surface) and intensity of the vortex. The correlation analysis between the spatial flow field measurement and the vortex identification result in surface pressure distributions verifies the effectiveness of the proposed method.

Key words: vortex signature identification, vortex interaction, vortex intensity, vortex center position, correlation analysis