Effect of Aspect Ratio on Flutter Characteristics of Fan/Compressor
In the present work, the blade vibration modes, distribution of displacement and natural vibration frequency were obtained using structural dynamics analysis. The unsteady aerodynamic force loading on blades and aerodynamic work were investigated using numerical analysis of 3-D unsteady flow around oscillating cascades, and the oscillating regulation was obtained by assuming the blade motion as harmonic vibration. The probability of blade flutter is predicted by using Energy Method. The flutter characteristics of linear cascades and fans with various aspect ratio are numerically analyzed respectively at the design Mach number and at design rotor speed. In this way, the influence and change rule of blade aspect ratio on flutter characteristics is initially learned. Additionally, the influence of aspect ratio on the efficiency is analyzed for fan rotors. Finally, we think that, low-aspect-ratio design rule for fan and compressor should be adopted to avoid flutter.
flutter aspect ratio unsteady aeroelastic aerodynamic work oscillating cascade
Shi Yong-qiang Yang Qing-zhen Zhou Xin-hai
School of Engine & Energy Northwestern Polytechnical University Xian, China
国际会议
The 3rd International Symposium on Jet Propulsion and Power Engineering(第三届喷气推进与动力工程国际会议 ISJPPE)
南京
英文
89-94
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）