Impact of the heat release distribution on high-frequency transverse thermoacoustic driving in premixed swirl flames
| Autor: | Michael Hertweck, Tobias Hummel, Frederik M. Berger, Thomas Sattelmayer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
020301 aerospace & aeronautics
Materials science Laminar flame speed lcsh:Mechanical engineering and machinery lcsh:Motor vehicles. Aeronautics. Astronautics General Physics and Astronomy Energy Engineering and Power Technology 02 engineering and technology Mechanics 01 natural sciences Transfer function 010305 fluids & plasmas Diffuser (thermodynamics) Physics::Fluid Dynamics Transverse plane Amplitude 0203 mechanical engineering Position (vector) 0103 physical sciences Automotive Engineering lcsh:TJ1-1570 Combustion chamber Physics::Chemical Physics lcsh:TL1-4050 Displacement (fluid) |
| Zdroj: | International Journal of Spray and Combustion Dynamics, Vol 9 (2017) |
| ISSN: | 1756-8285 1756-8277 |
| Popis: | Self-excited, high-frequency first transversal thermoacoustic instabilities in a cylindrical combustion chamber equipped with a premixed swirl-stabilized flame are investigated. Phase-locked image analysis of the phenomena shows the displacement of the flame and a higher burning rate in the region of elevated pressure. The impact of diffuser angle and fuel composition on the stability limits and the flame position is investigated. The Rayleigh-Index is computed for a three-dimensional domain based on analytical flame transfer functions for experimentally obtained data of OH*-chemiluminescence as measure for the spatial heat release. Two models from different sources are applied, which describe the interaction between flame and acoustic locally. The axial dependence of the amplitude of the transversal mode is computed by a numerical model, which takes the temperature distribution inside the combustion chamber into account. The comparison of the Rayleigh-Index of different operation points shows a correlation with the stability limits for some, but not for all investigated configurations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|