Abstract：By establishing a research model for aero-damping in a uniform incoming flow, the three-dimension analytical algorithm of the modal aero-damping based on the equivalent viscous damping principle was established. The algorithm, which is suited for low-speed flow, to compute aero-damping is based on classical lift line theory in aerodynamics, according to the analytical solution of unsteady aerodynamic force. According to the analytical equations, the modal aero-damping ratio for different nature frequencies of blades in various fluid field conditions can be solved, and the factors to affect the aero-damping can be determined. The first bend and the first torsion’s modal aero-damping ratios of a compressor blade are calculated by using the above algorithms. The results show that the aero-damping cannot be neglected comparing with the structure damping. It reflects the coupling degree between the flow field and the structure field, so the aero-damping is significant to compute the stress and life of blade.
出版日期: 2009-12-05
引用本文:
. A method of analysis for modal aero-damping of
vibrating blade in incompressible flow[J]. Front. Energy, 2009, 3(4): 465-471.
Jun XING, Lin LI, . A method of analysis for modal aero-damping of
vibrating blade in incompressible flow. Front. Energy, 2009, 3(4): 465-471.
Eick C D, Liu J S. Comparisons of aeroelasticcomputer code predictions agains measured rotor vibratory responsedata. AIAA 97-2750, 1997, 1―11
Moffatt S, Ning Wei, Li Yansheng, et al. Blade forced response prediction for industrialgas turbines, Part I: Methodologies. Journalof Propulsion and Power, 2005, 21(4): 707―714 doi: 10.2514/1.6126
Bertagnolio F, Gaunaa M, Sorensen N N, et al. Computation of modal aerodynamic damping usingCFD. AIAA-2003-0521, 2003, 1―11
Rasmussen F, Petersen J T, Madsen H A. Dynamic stall and aerodynamic damping. AIAA-98-0024, 1998, 44―51
Liu Ziqiang, Bai Kui, Mao Guoliang, et al. The determination of aerodynamic damping onhammerhead launch vehicles at transonic speeds. Journal of Astronautics, 2002, 23(6): 1―7
Huang Peng, Gu Ming. Experimental study on aerodynamicdamping of tall buildings after being interfered. Journal of Tongji University, 2003, 31(6): 652―656
Lin Yin. Aerodynamic damping research of vibration blade in flow field. Dissertationfor the Doctoral Degree. Beijing: Beihang University, 2006
