1D Raman/Rayleigh/CO-LIF line measurements of major and temperature in turbulent DME/air jet flame

Dimethyl ether (DME) is considered a promising alternative to diesel fuel in compression-ignition engines because of low particulate and NOx emissions along with high thermal efficiencies as well as improved auto-ignition characteristics due to its high cetane number. Recently, DME also has been selected as a prospective fuel candidate for the validation of turbulent combustion models organized within the TNF Workshop, where recent focus has shifted to fuels with increasing complexity as compared to hydrogen and methane. In this work we present experimental results of seven major species mole fractions (CO₂, O₂, CO, N₂, DME, H₂O, H₂) and temperature determined from Raman/Rayleigh/CO-LIF line measurements in a series of piloted, partially-premixed DME/air turbulent jet flames with 0.2 DME mole fraction in the jet. Results are presented for Flame D, the lowest jet exit Reynolds number case of the series. Mean and RMS radial profiles were derived from the instantaneous measurements at various axial positions downstream of the nozzle exit of the Sydney/Sandia piloted jet burner. Insights into the turbulent flame structure are examined by conditioning the data on the mixture fraction and comparing the turbulent flame results to one-dimensional laminar flame calculations at varying strain rates.