Non-normality in combustion-acoustic interaction in diffusion flames: a critical revision
| Autor: | Koushik Balasubramanian, Matthew P. Juniper, R. I. Sujith, Luca Magri |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Mechanical Engineering
Diffusion flame Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Transient growth 02 engineering and technology Mechanics Physics - Fluid Dynamics Condensed Matter Physics Combustion 01 natural sciences 010305 fluids & plasmas 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials 0103 physical sciences Duct (flow) Non normality |
| Zdroj: | Journal of Fluid Mechanics |
| Popis: | Perturbations in a non-normal system can grow transiently even if the system is linearly stable. If this transient growth is sufficiently large, it can trigger self-sustained oscillations from small initial disturbances. This has important practical consequences for combustion-acoustic oscillations, which are a continual problem in rocket and aircraft engines. Balasubramanian and Sujith (Journal of Fluid Mechanics, 2008, 594, 29-57) modelled an infinite-rate chemistry diffusion flame in an acoustic duct and found that the transient growth in this system can amplify the initial energy by a factor, $G_{max}$, of order $10^5$ to $10^7$. However, recent investigations by L. Magri & M. P. Juniper have brought to light certain errors in that paper. When the errors are corrected, $G_{max}$ is found to be of order 1 to 10, revealing that non-normality is not as influential as it was thought to be. 4 pages, 2 figures |
| Databáze: | OpenAIRE |
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