Numerical Simulation of Liner Vibrations in a Laboratory Combustion Chamber

Document Type : Research Article

Authors

1 Department of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Department of Mechanical Engineering, Shiraz University, Shiraz, Iran

Abstract

Combustion chambers are an important part of power generation systems that affect their efficiency and environmental pollutions. To reduce the pollutions, lean premixed combustion was introduced to be used instead of traditional non-premixed flames, however, this method has more tendency to become unstable. The thermal and acoustics interactions can amplify the acoustic waves and produce noise and increase the vibration level of the liner. The continuation of large amplitude vibrations can lead to failure. Therefore, the vibration modeling of the liner is very important. In this research, the vibration of a liner in a combustion chamber is investigated. The modal parameters in the cold and hot states are extracted from the finite element model. Then, model updating is utilized to modify the finite element model of the liner based on the experimental data. The flow analysis is also performed to obtain the pressure and velocity fluctuations during the analysis time. These data are used to model the flame as an acoustic source. Then, the transient analysis is evaluated to find the response of the liner due to this source. The results show the effectiveness of the updated model to predict the modal parameters and the vibration amplitude of the liner.     
 

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Main Subjects

References

 
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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 2
May 2021
Pages 881-896

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