Aeroacoustic coupling in can-annular combustors

Schematic of the modelling of can-annular systems via aeroacoustic coupling

 

In can-annular combustors, each flame burns in an essentially isolated manner in a can. The cans, however, are coupled at the downstream end by a small annular manifold that connects them to the turbine vane. The aeroacoustic response of the apertures that connect the cans couples the (thermo)acoustic response of the whole system, and causes the formation of eigenvalue clusters. The linear localization of the modeshapes and the nonlinear synchronisation oscillations are examples of the non-trivial phenomena that stem as a consequence of this (weak) coupling.

• PI: Dr. Alessandro Orchini
• Funding: DFG -- Projekt 422037803
• Collaborators: Prof. Nicolas Noiray (ETH Zurich), Prof. Jonas Moeck (NTNU Trondheim)

Related Publications

J. von Saldern, A. Orchini, J. Moeck, "A Non-Compact Effective Impedance Model for Can-To-Can Acoustic Communication: Analysis and Optimization of Damping Mechanisms" Journal of Engineering for Gas Turbines and Power, 2021, Vol. , pp. GTP-21-1352. [link]

J. von Saldern, A. Orchini, J. Moeck, "Nonlinear interaction between clustered unstable thermoacoustic modes in can-annular combustors" Proceedings of the Combustion Institute, 2021, Vol. 38, pp. 6145-6153. [link]

J. von Saldern, A. Orchini, J. Moeck, "Analysis of Thermoacoustic Modes in Can-Annular Combustors Using Effective Bloch-Type Boundary Conditions" Journal of Engineering for Gas Turbines and Power, 2020, Vol. 143, pp. GTP-20-1439. [link]