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Lock-in phenomenon of tip clearance flow and its influence on aerodynamic damping under specified vibration on an axial transonic compressor rotor

引用

Chinese Journal of Aeronautics 2022年第3期35卷 185-200页

作者： Le HAN Dasheng WEI Yanrong WANG Mingchang FANG School of Energy and Power Engineering Beihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100083China

In this study,the lock-in phenomenon of tip clearance flow(TCF)instabilities and their relationship to blade vibration are investigated numerically on an axial transonic rotor with a large tip *** capabilities of simulating instability flow and lock-in phenomenon are verified on a transonic rotor and a NACA0012 airfoil by comparing with the test data,*** lock-in phenomenon is first numerically confirmed that may occur to TCF instabilities when its frequency is close to the blade vibration *** lock-in region becomes wider with the vibration amplitude increasing,and it is also affected by modal *** the rotor at the simulation conditions in this study,the bending mode results in a wider lock-in region than the torsional *** the lock-in region,the phase difference between the tip clearance Vortex(TCV)and the blade vibration changes with the flow condition and the frequency ratio of the blade vibration and the TCV *** frequency of the TCV instabilities reduces with the mass flow ***,reducing mass flow and increasing frequency ratio have similar effects on the TCV phase,which causes a significant variation on the unsteady pressure amplitude in the blade tip ***,the aerodynamic damping changes significantly with the TCV *** aerodynamic damping displays a nonlinear relationship with the vibration amplitude,and it changes from negative to positive with the vibration amplitude increasing at the same frequency *** negative damping is mainly provided by the tip area of the *** unlocked conditions,the period of the TCF instabilities fluctuates over time,and it cannot be directly separated by their frequency *** Blade Phase Angle(IBPA)also has an important influence on the feature of the TCV *** occurrence of frequency lock-in also requires“appropriate”*** the examined working conditions,the frequency lock-in occurs under 0 ND(Nodal Diameter),but not un

关键词： Aerodynamic damping Inter blade phase angle Lock-in Specified blade vibration tip clearance flow instabilities

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