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Research Article
 

Study on Coherence of Composite Unsteady Aerodynamic Excitations and Response Imposed on Rotor Blade



Fang Li-cheng, L.I. Shun-ming, D.U. Jian-jian and Chen Mo-li
 
ABSTRACT

In order to investigate the influences of unsteady aerodynamic excitations imposed on the blade, we focused on analyzing three atypical coherence functions between unsteady aerodynamic excitations and responses. By using the data obtained from single-stage low-speed axial compressor test rig and with coherence and partial coherence methods, we investigated the characteristics of three kinds of excitations and analyzed the coherence between excitation component and response signal. Our results indicated that coherence method could extract the response characteristics of the unsteady aerodynamic excitations and distinguish different influences on the blade. And with this method, we could conduct the quantitative analysis and ordering of each excitation component; rail excitation’s influence on the blade concentrates in the higher frequencies, rotating stall’ aerodynamic excitation concentrates in the low frequencies and the inlet distortion exists in both high and low frequencies. At the same time, we could use the partial coherence analysis to compare the characteristics of individual aerodynamic excitation and extract various factors existing in the mixed excitations, additionally, we could conduct quantitative analysis of each excitation’s influence on the response when a variety of unsteady aerodynamic excitations coexisted.

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  How to cite this article:

Fang Li-cheng, L.I. Shun-ming, D.U. Jian-jian and Chen Mo-li, 2013. Study on Coherence of Composite Unsteady Aerodynamic Excitations and Response Imposed on Rotor Blade. Journal of Applied Sciences, 13: 1698-1703.

DOI: 10.3923/jas.2013.1698.1703

URL: https://scialert.net/abstract/?doi=jas.2013.1698.1703

REFERENCES
Caruthers, J.E. and W.N. Dalton, 1993. Unsteady aerodynamic response of a cascade to nonuniform inflow. J. Turbomach., 115: 76-84.
Direct Link  |  

Chen, M.L. and S.M. Li, 2007. Coherence functions method for signal source identification. Machine Build. Automation, 38: 75-79.

Durali, M. and J.L. Kerrebrock, 1998. Stator performance and unsteady loading in transonic compressor stages. J. Turbomach., 120: 224-232.
Direct Link  |  

Hall, K.C. and J.M. Verdon, 1991. Gust response analysis for cascades operating in nonuniform mean flows. AIAA J., 29: 1463-1471.
Direct Link  |  

Hsu, S.T. and A.M. Wo, 1998. Reduction of unsteady blade loading by beneficial use of vortical and potential disturbances in an axial compressor with rotor clocking. J. Turbomach., 120: 705-713.
Direct Link  |  

Hu, J.A., 2001. Inlet distortion effects in a five-stage compressor. J. Aerospace Power, 16: 142-146.

Lecht, M. and H.B. Weyer, 1979. Unsteady rotor blade loading in an axial compressor with steady-state inlet distortion. AGARD Stress, Vibrations, Struct, N79-27176 (AH),1979.

Qiao, W.Y. and Y.H. Cai, 2001. Numerical modeling of the unsteady aerodynamic loads in axial flow compressor with inlet distortions. J. Propulsion Technol., 22: 392-396.
Direct Link  |  

Weatherrill, N.P. and O. Hassan, 1994. Efficient three-dimensional Delaunay triangulation with automatic point creation and imposed boundary constraints. Int. J. Num. Meth. Eng., 37: 2005-2039.
CrossRef  |  Direct Link  |  

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