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Combustor Residence Time Measurement Using Planar Laser Induced Florescence

[+] Author Affiliations
Adrian Spencer, Liangta Cheng

Loughborough University, Loughborough, UK

Paper No. GT2010-22573, pp. 471-482; 12 pages
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4397-0 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by Rolls-Royce plc


Combustor performance parameters are strongly affected by the residence time of the combustion chamber. Both the time mean velocity and the turbulence fields are important to the residence time of the gases within it. However, determining the residence time via analysis of a measured velocity field is difficult, particularly due to the inherent unsteadiness and three dimensional nature of the flow within a combustor. A more direct approach is to use a passive transported scalar and look at the dynamic response of the scalar concentration to a step change in the injection rate of it. This may be done with a high spatial and temporal resolution using modern high frame rate digital cameras. A time resolved planar laser induced florescence (PLIF) technique is described that has been used to characterize the residence time within a combustion chamber. Characteristic times evaluated from the measurements are the convection (or delay time) from the point of injection and scalar decay rate (or half life) due to turbulent mixing once the effect of the reduced scalar concentration injection has been transported to the point of interest, other measures are possible but these are the most relevant to flow fields with significant recirculation. The technique is described for a single phase isothermal aerodynamic flow field, but with further consideration the technique could be extended to reacting combustors. Not only does the data provide a useful insight to the mixing phenomena and relevant time scales, it also provides suitable validation data for time dependent CFD predictions in which it is easy to solve for a conserved scalar.

Copyright © 2010 by Rolls-Royce plc



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