Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

High amplitude combustion instabilities are a destructive and increasingly pervasive problem in gas turbine combustors. Although much research has focused on measuring the characteristics of these instabilities, there are still many remaining questions about the fluid-mechanic mechanisms that drive the flame oscillations. In particular, a variety of complex disturbance mechanisms arise during velocity-coupled instabilities excited by transverse acoustic modes. The resulting disturbance field has two components - the acoustic velocity fluctuation from both the incident transverse acoustic field and the excited longitudinal field near the nozzle, and the vortical velocity fluctuations arising from acoustic excitation of hydrodynamic instabilities in the flow. In this research, we look at the relative contribution of these two components as the amplitude of transverse excitation increases for a swirling flow and swirl-stabilized flame in a transverse forcing combustor that mimics the geometry of an annular combustor. Proper orthogonal decomposition is tested as a methodology for decomposing the velocity disturbance field and is used to understand the relative contributions of these two disturbance mechanisms.

Original languageEnglish (US)
Title of host publication52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624102561
DOIs
StatePublished - 2014
Event52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014 - National Harbor, MD, United States
Duration: Jan 13 2014Jan 17 2014

Publication series

Name52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014

Other

Other52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014
CountryUnited States
CityNational Harbor, MD
Period1/13/141/17/14

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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    O'Connor, J. (2014). Effect of excitation amplitude on disturbance field of a transversely forced swirl flow and flame. In 52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014 (52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2014-0658