FLUTTER SPEED ANALYSIS OF BEND-TWIST COUPLED LONG FLEXIBLE BLADE
The flutter speed of bend-twist coupled blades is studied.An analytical method based on FAST_v8 and nonlinear geometrically accurate beam theory is proposed to evaluate blade flutter speed.The accuracy of the analytical method is verified based on typical section instability mechanism.Taking an 80.74 m blade as the research object,the effects of air density,the position of blade gravity,torsional frequency and flap-wise on flutter velocity are analyzed.The results show that flutter speed decreases with the increase of air density.Classical flutter can be effectively inhibited by centroid forward movement.Increasing torsional frequency can improve blade stability.It is suitable when the flap-wise frequency is between 0.2 and 0.4 Hz.
万方数据
维普
