An experimental and computational study of a multi-swirl gas turbine combustor

摘要: Abstract The turbulent flow and flame dynamics within a lean direct fuel injection (LDI) multi-swirl gas turbine combustor is examined using combination of state-of-the-art diagnostic methods, including laser doppler velocimetry (LDV), particle imaging (PIV) fine bead thermocouples, modern computational such as flamelet-based large eddy simulations (LES). computations provide unsteady field data any quantity interest, but are to some extent model dependent, whereas the laboratory studies often can capture only end-results real processes with limited details. combined perspectives thus mutual validation diagnostics models, more complete understanding physical chemical involved, also interdependencies between that very difficult characterize in laboratory. In turn, this provides an improved framework for modification present combustors design future generations. Good agreement LES experimental found both non-reacting reacting regimes studied. Both cases were be sensitive inflow into swirler, confinement. case dominated by annular swirling jet, central recirculation zone (CRZ) weak precessing vortex core, oscillating at ∼250 Hz. For CRZ remains, dominates upstream section resulting wall jets. Longitudinal pressure fluctuations ∼380 Hz (420 Hz experiments) observed case.