Thermoacoustic Modeling and Control of Multi Burner Combustion Systems

  • Schuermans B
  • Bellucci V
  • Paschereit C
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Abstract

Thermoacoustic interactions in industrial combustion systems are difficult to model because they involve com- plex interactions between several physical mechanisms. In order to obtain dynamic models of such systems, a hy- brid approach is used: numerical, experimental and an- alytical techniques are combined to describe the system. The system is modeled as a modular network, where the input–output relation of the modules can be based on ana- lytic models, experimental data or numerical analysis. The modules are represented as state-space realizations. A modal expansion technique is used to obtain a state-space representation of the acoustic propagation through com- plex 3-dimensional geometries. The modal expansion can be based on an analytic model (for relatively simple vol- umes), or on a finite element analysis (for geometries of any complexity). Modules that are very complex, such as the acoustic behavior of the combustion process itself, are modeled using a combined experimental and analytic ap- proach. The method is not restricted to symmetries of any kind: configurations with geometrically or operationally dif- ferent burners are simulated. The state-space network approach allows for time domain simulations, including non-linearities. An active controller has been synthesized for an (hypothetical) annular multi burner combustion sys- tem. The controller uses spatial filtering to decompose the acoustic field to its individual modes. The modes are then controlled using an H∞ control algorithm. Time domain

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Authors

  • Bruno Schuermans

  • Valter Bellucci

  • Christian Oliver Paschereit

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