Turbulence-chemistry interactions in piloted premixed flames

Summary

The objective of the project is to improve current capabilities to compute the structure of turbulent premixed flames where the interactions between turbulence and chemistry are high due to strong shear.

Supervisor(s)

Professor Assaad Masri

Research Location

Aerospace, Mechanical and Mechatronic Engineering

Program Type

Masters/PHD

Synopsis

Turbulent premixed flames with strong shear-generated turbulence are relevant in many application including afterburners, dump combustors and ramjets. However, these applications involve complex flows with strong recirculation to stabilize the flame. It would be better to study flows in which this complexity of the flow field is not present. A new piloted jet premixed flame burner has been developed involving a high velocity jet of pre-mixture mixing into a hot vitiated co-flow that approximates fully-burnt combustion products of the jet pre-mixture. Stabilization is achieved by means of a pilot annulus of hot combustion products that is still rich in radicals. Recent results using joint planar Rayleigh scattering and planar laser fluorescence of OH show that at low jet velocity the flame is of the wrinkled laminar flame type, while at higher velocity local extinction occurs with subsequent re-ignition. The objective of this project is to improve our understanding of such flames by performing more laser-based measurements as well as computations. Experiments will include LIF imaging of species such as CH and NO while calculations will involve probability density function methods.

Additional Information

Please go to http://sydney.edu.au/engineering/people/assaad.masri.php to view Professor Assaad Masri's Biographical details, research interests and current projects.

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Keywords

turbulent combustion, premixed flames, laser diagnostics, turbulence-chemistry interactions, finite-rate chemistry

Opportunity ID

The opportunity ID for this research opportunity is: 292

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