jump to content

jump to main navigation

TU Berlin

Document content

There is no English translation for this web page.

Data-based modelling and machine learning

Gradient-free optimisation for the automatic suppression of instabilities
 

The recent advent of powerful algorithms able to extract information from large sets of data without the need of accurately modelling physical systems is having a large impact on the engineering world. Gradient-free methods, dynamic mode decomposition, clustering and genetic algorithms are examples of the tools that the combustion and acoustic communities are exploiting to shed new light on available data, or to solve optimisation problems that require a too large amount of computational power with standard methods.

  • Collaborators: Prof. Myles Bohon (TU Berlin), M. Reumschüssel

Related Publications

M. Reumschüssel, J. von Saldern, Y. Li, C.O. Paschereit, A. Orchini, "Gradient-Free Optimization in Thermoacoustics: Application to a Low-Order Model" Journal of Engineering for Gas Turbines and Power, 2021, Vol. , pp. GTP-21-1284. [link]

 
M. Bohon, A. Orchini, R. Bluemner, C.O. Paschereit, E. Gutmark, "Dynamic mode decomposition analysis of rotating detonation waves" Shock Waves, 2020, Vol. 921, pp. 1-13. [link]
 

M. Bohon, R. Bluemner, A. Orchini, C.O. Paschereit, E. Gutmark, "Analysis of rdc operation by dynamic mode decomposition (DMD)" AIAA Propulsion and Energy, 2019, AIAA 2019-4377. [link]

Auxiliary Functions / Extras

Help Functions

Aeroacoustic coupling in can-annular combustors

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 connec ...
more...
 

Adjoint-based perturbation theory

Thermoacoustic eigenvalues are known to be very sensitive to small variations in the operating conditions and geometry. The first order (linear) sensitivity of the eigenvalues can  ...
more...
 

Role of exceptional points in the thermoacosutic spectrum

Exceptional points (EPs) are ubiquitous in physics. They are peculiar degenerate eigenvalues that appear in the spectrum of any non-conservative system when one (or more) parameter ...
more...
 

Symmetry-induced degeneracies and symmetry breaking

Combustion in gas turbines and aeroengines takes place in combustion chambers that have a nominal (discrete) rotational symmetry. The presence of symmetries induces some thermoacou ...
more...
 

Nonlinear heat release rate response

Thermoacoustic instabilities can be predicted by means of linear stability theory. When one or more modes are unstable, however, it is the nonlinear response of the heat released b ...
more...