Investigation on the Airframe Aerodynamic Characteristics of One Helicopter in Wind Tunnel Test
The paper introduces the wind tunnel,model,holder,aerodynamic balance and the installation of the model/holder and the holder/aerodynamic balance for one helicopter.By investigating the omnidirectional aerodynamic characteristics of the airframe and the aerodynamic characteristics of each aerodynamic component,qualitatively evaluates the airflow environment close to the horizontal tail and the flow field near the surface of the fuselage as well as the influence of flow field separation close to the lower surface on helicopter flight characteristics.Tests show that both ordinary holder and special holder used are suitable for the wind tunnel test to obtain the omnidirectional aerodynamic characteristics of the airframe;the aerodynamic interference of the fuselage on the horizontal tail is acceptable;the sudden change of the longitudinal aerodynamic characteristics is acceptable,which is caused by the suddenly separated flow around the bottom of the fuselage at sideslip angle β=0° and angle of attack α=-72°;although the flow field around the airframe separated locality,the flow is stable.
model helicopterairframefuselagehorizontal tailwind tunnel testflow rateangle of attackangle of slip
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