Publications
Multiparameter spatio-thermochemical probing of flame-wall interactions advanced with coherent Raman imaging
Ultrabroadband coherent anti-Stokes Raman spectroscopy (CARS) was employed for one-dimensional imaging of temperature and major species distributions simultaneously in the near-wall region of a CH4/air flame supported on a side-wall-quenching burner. Automatic temporal and spatial overlap of the approximetaly 7 fs pump and Stokes pulses was achieved through a two-beam CARS phase-matching scheme and the crossed approximately 75 ps probe beam provides excellent spatial sectioning of the probed location. Concurrent detection of N2 O2 H2 CO CO2 and CH4 was performed. A CH4/air premixed flame at lean stoichiometric and rich conditions and Reynolds number = 5000 was probed as it quenches against a cooled steel side-wall parallel to the flow providing a persistent flame-wall interaction. An imaging resolution of better than 40 μm was achieved across the field-of-view allowing thermochemical states of the thermal boundary layer to be resolved to within approximately 30 μm of the interface.