Experimental Study Of Interaction Law Between Streamwise Vortex And Airfoil

The interference between the components of the vortex and the aircraft exists in a large number of aircraft and has an important influence on the aerodynamic performance of the aircraft.According to the interference between vortex and wing flow,the design of a longitudinal vortex generator model,an experimental platform is built to interference between vortex and wing,on the wing vortex interference law,obtained the flow around the wing structure and its change in the streamwise vortex under the action of the analysis of the change of the wing the.The results show that the streamwise vortex will have a significant effect on the flow around the wing: the vortex will cause significant changes in the pressure distribution on both sides of the vortex core.From the downstream observation,counterclockwise rotation of the vortex,the vortex core left(right)side of the flow under the washing(wash),will lead to the separation of the wing surface was delayed(early);the streamwise vortex will make curve of wing lift coefficient changes,suppress the hysteresis loop of lift coefficient curve of the wing,but also decreased will cause the maximum lift coefficient.There is a significant influence on the wing convection vortex,which leads to the obvious displacement of the vortex core position in the wing extension,the change of the flow direction of the vortex and the attenuation of the vorticity.Some geometric parameters that affect the degree of interference between the streamwise vortex and the wing are analyzed.The interaction between the streamwise vortex and the wing is influenced by the height between the vortex core and the leading edge of the wing.The results in this paper are of great significance for further research on the interaction mechanism between the streamwise vortex and airfoil,and have important engineering application value for improving the aerodynamic characteristics of aircraft.