Abstract:
The interaction between vortices and the object surface exists in various situations. The vortex changes the pressure distribution of the surface, and the object influences the evolution of the vortex structure. By focusing on the typical flow problem of streamwise vortex and object surface interaction, the evolution of vortex flow structure and the change of surface pressure distribution are studied by means of wind tunnel test. During the evolution of streamwise vortex, not only the spanwise displacement but also the off-plane displacement occurs. With the incidence height decreased by 0.1
c, the maximal spanwise displacement increases by 0.3
c, and the maximal off-plane displacement increases by 0.02
c. It can be observed from the dynamic pressure measurement results that the streamwise vortex leads to a concentrated strip low pressure distribution and pressure fluctuation concentration area on the plate. The study of vortex-surface interaction is helpful to understand the physical mechanism of the interaction between vortices and aerodynamic surface, and to further understand the influence of complex vortex flow on the component load and aerodynamic characteristics of aircraft.