This paper compares flow structures in a single- and triple-nozzle swirl combustor. Realistic combustor hardware usually contains several nozzles; however, test facilities for studying flame dynamics commonly use one nozzle. As such, it is important to determine how nozzle–nozzle interactions influence the dynamics of the system. Simultaneous 5 kHz OH planar laser-induced fluorescence and stereoscopic particle image velocimetry measurements were obtained from a premixed, swirling methane–air flame. Time-averaged flowfields of the single- and triple-nozzle configurations are compared, showing agreement in the axial velocities and flow spreading angles. However, the comparison reveals nonnegligible differences in reverse flow velocities of the recirculation zone and in flame spreading angles. The paper then compares the response of the unsteady flowfield to transverse acoustic excitation, for two configurations that excite strong axisymmetric and helical shear-layer disturbances. These disturbances exhibit similar spatial growth and decay trends as well as nearly identical convection speeds upstream of the jet merging region. These results corroborate previous findings, which show that, despite differences in time-averaged quantities, comparable flow dynamics occur in single- and multinozzle swirl flames.
Comparison of Single- and Multinozzle Reacting Swirl Flow Dynamics
Journal of Propulsion and Power ; 34 , 2 ; 384-394
2017-09-19
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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