The Nonlinearity during Start-Oscillation of Thermo-Acoustic Instability in Rijke-Type Combustor

Abstract:

In order to study the nonlinearity during the start-oscillation of thermo-acoustic instability, an experimental setup was built. The growing process of nonlinearity during the start-oscillation of thermo-acoustic instability was captured and analyzed. Experimental results revealed that after a suitable resonance mode corresponding to the structural of the combustor was selected, the pressure perturbations inside the combustor grow in amplitude into a very large amplitude and self-excited oscillation in a very short period of time. Then, slowly, the nonlinear effects adjust the shapes of pressure waveforms and amplify the oscillations. Ultimately, a limit-cycle oscillation with smooth and uniform pressure waveforms was obtained, and the acoustic waves exhibit only the main resonance mode, damping other modes of instability.

• Periodical: Advanced Materials Research (Volumes 204-210)
• Pages: 1158-1161
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.204-210.1158
• Online since: February 2011
• Authors: Guo Neng Li, Chen Yang Zang, Kai Li
• Keywords: Nonlinearity, Rijke-Type Combustor, Start-Oscillation, Thermo-Acoustic Instability

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