Simultaneous 100-kHz acetone planar laser-induced fluorescence and OH* chemiluminescence in a linear non-premixed detonation channel

Reactant mixing and combustion are investigated in an optically accessible, self-excited linear detonation combustor. The field is captured using 100 kHz planar laser-induced fluorescence (PLIF) imaging of acetone as a tracer the fuel supply, while chemiluminescence excited-state hydroxyl (OH*) radicals simultaneously resolves evolution wave. Time sequences acquired over multiple cycles each test, with acetone-PLIF images collected along orthogonal planes to reveal complex three-dimensional topography distribution. instantaneous phase-averaged enable measurement key injection characteristics, such injector recovery time, jet velocity, refill height for range operating conditions. Instantaneous measurements time-coincident OH* also number features, stratification weak near field, incomplete deflagration behind wave, vitiation reactants ahead oxidizer time mismatch. These significantly enhance ability obtain detailed information on intracycle intercycle spatiotemporal reactant process its coupled effects wave structure propagation.