Wing-rotor interactions on a 1/4-scale tiltrotor half-model
摘要
In a tiltrotor aircraft, the aerodynamic interaction between wing and rotors can have a negative influence \non the hovering performance and on the lifting capability. In 2011, a research activity has been started \nat Dipartimento di Scienze e Tecnologie Aerospaziali at Politecnico of Milano to study from both an \nexperimental and numerical point of view the aerodynamic interference between wing and rotor on a \ntiltwing aircraft. A 0.25 scale model, based on the aircraft geometry defined at the very beginning of \nthis activity, has been manufactured in–house and the experimental test rig represents only one half– \nwing and the corresponding rotor and nacelle. The rotor performance were evaluated in terms of figure of \nmerit both for the isolated rotor and for the half–model configurations. Two different wing configurations \n(untilted and tilted) were tested to understand how the airframe affects the rotor performance. The forces \ngenerated on wing by the rotor wake were measured for a wide range of thrust coefficients for both wing \nconfiguration. Particle–image velocimetry technique was used to acquire two–dimensional images of the \nflow field close to the tilted part of the wing.