Combustion dynamics of premixed swirling flames with different injectors
Lean premixed (LPM) combustion systems achieve low pollutant emission levels, with compact flames and high power densities, but are highly sensitive to dynamic phenomena, e.g, flashback, blowout and thermoacoustic instabilities, that hinder their practical application. Most LPM gas turbine combustor...
| Main Author: | |
|---|---|
| Format: | Others |
| Language: | en |
| Published: |
2020
|
| Online Access: | https://tuprints.ulb.tu-darmstadt.de/11392/1/Thesis_Gatti_finale_TUD.pdf Gatti, Marco <http://tuprints.ulb.tu-darmstadt.de/view/person/Gatti=3AMarco=3A=3A.html> (2020): Combustion dynamics of premixed swirling flames with different injectors.Darmstadt, Technische Universität, DOI: 10.25534/tuprints-00011392 <https://doi.org/10.25534/tuprints-00011392>, [Ph.D. Thesis] |
| Summary: | Lean premixed (LPM) combustion systems achieve low pollutant emission levels, with compact flames and high power densities, but are highly sensitive to dynamic phenomena, e.g, flashback, blowout and thermoacoustic instabilities, that hinder their practical application. Most LPM gas turbine combustors use swirling flows to stabilize compact flames for efficient and clean combustion. A better knowledge of the mechanisms of steady and unsteady combustion of lean premixed swirled mixtures is then of practical, as well as fundamental interest. This thesis is a contribute towards the achievement of this goal. A burner, made of several components with variable geometry, was specifically designed for this scope. An experimental analysis was conducted to investigate the main parameters leading to a reduction of the sensitivity of LPM systems to dynamic phenomena. The diagnostics applied include flame transfer function (FTF) measurements, laser diagnostics (LDV and PIV)
and flame imaging. Large eddy simulations were also exploited to elucidate the mechanisms behind the experimental observations. |
|---|