Vibro-Acoustic Coupling Analysis of Aero-Engine Combustion Chamber Model
The combustion instability is an important reason for fatigue failure of the vibro-acoustic coupling combustion chamber thin-walled structure. The vibro-acoustic coupling equations of closed cavity are derived; The vibro-acoustic coupling coefficient matrix is calculated, it indicates that couplings between the acoustic modes and the structure modes are strictly selective; The vibro-acoustic coupling characteristics of the finite length simply supported closed cylindrical space and the combustion chamber flame tube modals are studied with the finite element method, and the little effect of modal coupling on frequency value is founded; The vibro-acoustic coupling test validation of the combustion chamber flame tube model is completed, and the results show that both the structure modes of the flame tube and the acoustic modes have the phenomenon of weak coupling.
Y. T. Ai et al., "Vibro-Acoustic Coupling Analysis of Aero-Engine Combustion Chamber Model", Applied Mechanics and Materials, Vols. 44-47, pp. 4100-4104, 2011