Abstract

Lean premixed swirling flames are important in practical combustors, but a commonly encountered problem of practical swirl combustors is thermo-acoustic instability, which may cause internal structure damage to combustors. In this research, a high-repetition-rate burst-mode laser is used for simultaneous particle image velocimetry and planar laser-induced fluorescence measurement in an unconfined acoustically excited swirl burner. The time-resolved flow field and transient flame response to the acoustic perturbation are visualized at 20 kHz, offering insight into the heat release rate oscillation. The premixed mixture flow rate and acoustic modulation are varied to study the effects of Reynolds number, Strouhal number, and acoustic modulation amplitude on the swirling flame. The results suggest that the Strouhal number has a notable effect on the periodic movements of the inner recirculation zone and swirling flame configuration.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Instantaneous 3D imaging of highly turbulent flames using computed tomography of chemiluminescence

Khadijeh Mohri, Simon Görs, Jonathan Schöler, Andreas Rittler, Thomas Dreier, Christof Schulz, and Andreas Kempf
Appl. Opt. 56(26) 7385-7395 (2017)

Burst-mode OH/CH2O planar laser-induced fluorescence imaging of the heat release zone in an unsteady flame

Ulrich Retzer, Rongchao Pan, Thomas Werblinski, Franz J. T. Huber, Mikhail N. Slipchenko, Terrence R. Meyer, Lars Zigan, and Stefan Will
Opt. Express 26(14) 18105-18114 (2018)

Temperature field investigation of hydrogen/air and syngas/air axisymmetric laminar flames using Mach–Zehnder interferometry

Sadrollah Karaminejad, Mohammad Hossein Askari, and Mehdi Ashjaee
Appl. Opt. 57(18) 5057-5067 (2018)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Supplementary Material (9)

NameDescription
» Visualization 1       case 1b
» Visualization 2       case 2a
» Visualization 3       case 2b
» Visualization 4       case 2c
» Visualization 5       case 3a
» Visualization 6       case 3b
» Visualization 7       case 3c
» Visualization 8       case 4a
» Visualization 9       case 4b

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription