Velocity Measurements and Gas Mixing Characterization at the Exit of an Isothermal Model of a Gas Turbine Premixer FREE

[+] Author Affiliations
Paolo Burattini, Alessandro Talamelli

University of Pisa, Pisa, Italy

Giordano Tanzini

ENEL, Polo Termico, Livorno, Italy

Gaudenzio Mariotti

ENEL, Polo Termico, Pisa, Italy

Fabio Turrini

FiatAvio, Torino, Italy

Paper No. 99-GT-278, pp. V002T02A049; 7 pages
  • ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Indianapolis, Indiana, USA, June 7–10, 1999
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7859-0
  • Copyright © 1999 by ASME


Premixed flames have shown to provide sufficient low NOx emission levels in gas turbine combustor. To achieve this goal several issues are to be addressed. Highly uniform fuel air ratio along with proper velocity profiles at the flame front has to be achieved. Vortex generators are commonly employed inside lean premixed combustor to generate a swirling flow that can assure the two aspects above. An experimental parametric study of the isothermal swirl flow of a non-confined prototype premixer is presented. Several different geometrical details have been considered for two different fuel air ratios. Velocity fields and mixing distribution between fuel and air at the premixer exit are described. Velocity and turbulence data can be related to formation of flashback and temporal homogeneity of the mixture respectively while the degree of spatial mixing, in terms of segregation factor, is connected with NOx rate of formation. In both cases the vigorous and high responsive character of the vortex generated by the swirler plays a major role. The final objective is twofold: to define an optimum geometrical arrangement to be tested in subsequent combustion tests and to demonstrate the feasibility of a rapid assessment method of degree of mixing between fuel and air.

Copyright © 1999 by ASME
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