Portal de Periódicos da CAPES

Comparison of Calculated and Measured Helicopter Rotor Lateral Flapping Angles

1981; Vertical Flight Society; Volume: 26; Issue: 2 Linguagem: Inglês

10.4050/jahs.26.46

2161-6027

Wayne Johnson,

Aeroelasticity and Vibration Control

Calculated ami m e a s u r e d v a l ~ of helicoptee rotor flapping acgles in fomazd flight are compared for a model rotor in a w i n d tunnel and an autoein, in a i d -mat. he lateral flapplq angles can be ac-tely predicted when a calculation of the nonuaifam wake-iaducad velocity is used.A t low advaace.ratioS, it I s also necessary to use a free wake genaetry calculation.For the cases considered, the t i p vertices In the rotor wake remain very close to the tip-path plane, so the calculatec!values of the flapping motion are sensitive to the f i n e details of the wake structure.specifically ths iriscous core radius of the t i p vortices.