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Vol. 162, Issue 1, January 2014, pp. 197-202

 

Bullet

 

Vibration Analysis of Blade Under Multiple Composite Unsteady Excitations
 

Licheng FANG, Shunming LI, Sai MA, Jiyong LI

College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Tel.: (+86) 025-84891027

E-mail: fanglicheng@nuaa.edu.cn

 

Received: 9 October 2013 /Accepted: 9 January 2014 /Published: 31 January 2014

Digital Sensors and Sensor Sysstems

 

Abstract: In order to understand the effects of the unsteady aerodynamic excitations in complex flow field on blades, on the basis of the data obtained from the single-stage axial flow compressor, three kinds of exciting forms in the compressor had been studied, including the correlation between excitations and responses in the upstream blade row wake, inlet distortion and rotating stall. Results showed that the response characteristics of the unsteady aerodynamic excitation could be extracted by adopting cross-relation method to distinguish effects of different exciting forms on blades. When many kinds of unsteady aerodynamic excitations co-existed, various exciting factors could be extracted from the mixed excitations through the cross-correlation analysis of excitation and response signals and by comparing with the characteristics of single aerodynamic excitation. Simulation data showed that the trail excitation energy on blades focused mainly on high frequency domains, the dynamic excitation of rotating stall centered on low frequency domains the excitation of the inlet distortion on blades existed in both high and low frequencies and amplitude at low frequency was larger than that at high frequency.

 

Keywords: Aerodynamic excitation characteristic, Inlet distortion, Trail excitation, Rotating stall, Correlation analysis.

 

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