In this paper we extended the operational map of our axial-staged combustor at pressure of five atmospheres to premixed and partially premixed jet-in-crossflow flames. This study attempts to close the gap to atmospheric data and could significantly aid scaling to real gas turbine engine conditions at 20-30 atm. High speed camera, PIV, CH\* chemiluminescence, temperature and pressure measurements were taken and processed to allow accurate reconstruction of six operating points with a single CFD model under minimal adjustments. Variation of crossflow (φ = 0.575 and 0.73) and jet (φ = 1.1, 4 and 8) equivalence ratio has been investigated for a four mm axial jet. The premixed flames were found to be controlled by the crossflow temperature before ignition and the crossflow oxygen content during combustion. Analysis of flame shape and position for the partially premixed operating points describes a lee-stabilized as well as a more unsteady windward flame branch. Adjustment of added jet fuel and crossflow temperature along with its corresponding oxygen level is required to attain a compact flame body. The risk of delaying combustion progress is significantly increased at a jet φ = 8 and an overshooting, spatially divided flame was attained with a crossflow φ = 0.73. Control towards a compact flame body is critical to allow combustion at reasonable reaction rate.


Simulation of Premixed and Partially Premixed Jet-in-Crossflow Flames at High-Pressure

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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