Turbulent flow effects on high sweep-back angle delta wing at low reynolds number

Abstract

Effects of turbulent flow to dynamic characteristic of high sweep-back angle Delta wing were performed by numerical (SIM) and experiment (EXP) method in subsonic flow. The numerical method was based on CFD methods using ANSYS/FLUENT software, while experiment method was conducted in low speed wind tunnel (Mach number M=0.1). At low Reynolds number, air velocity 2.5m/s, the Delta wing was investigated with attack angle of 20 degree within four cases of turbulence intensity, which varied from 0.5% to 15% due to parameter of grid. Decay of turbulence intensity with and without grid was considered. Change of dynamic characteristic of Delta wing caused by different change of turbulence intensity at inlet flow was also observed. Finally, distribution of pressure on Delta wing were measured and calculated; and then interaction between turbulent flow and vortex on upper wing was clarified.