Studies of Fuselage Effect on Vortex Dynamics and Performance of Bird's-body Type Fuselage (BBTF)-Fighter in Water Tunnel

摘要

The fuselage effect on vortex dynamics and performance on BBTF model aircraft investigatedusing water tunnel. Flow visualization testing uses a water tunnel because it can reveal the vortex dynamicsphenomenon easily visually. Testing was conducted by varying some form of the fuselage to observe the effect ofshape fuselage on vortex dynamics and aerodynamic force on the aircraft model. Three models used such asoriginal, wall symmetric and without the fuselage. The test used a fluid velocity of 0.1 m/s and Reynolds number6.577 x 103 on a 1: 110 scale model. The flow visualization was measured using dye injection method. Thisstudy used a print ink type with a mixture ratio of 1:8. The result of the research using GAMA water tunnelshowed the aerodynamic force and vortex dynamics phenomenon that happened on BBTF model aircraft. Thefuselage effect made the difference in lift and drag coefficients. The highest lift coefficient occurred in theoriginal fuselage model about 1.47 on the angle of attack of 40°. In addition to differences on aerodynamicforces, fuselage also affected the formation of vortex cores and vortex breakdown. Furthermore, on the originalfuselage model, the vortex breakdown location on the main wing was much farther than the symmetric wallfuselage and without fuselage models on a small angle of attack. However, at the high angle of attack, thevortex breakdown location was the same. The resulting correlation equation can be used to estimate the powergenerated by the turbine by the size of the field well in the operating area of the tip speed ratio of the turbinedesign.