Experimental heat release rate imaging during flame-wall interactions by simultaneous CH 2 O / OH-PLIF measurements

In this study, relative heat release rate (HRR) distributions of stoichiometric premixed dimethyl ether (DME) flames are experimentally investigated during atmospheric side-wall quenching (SWQ), to provide both an improved understanding of phenomena in flame-wall interaction (FWI) and validation data for numerical simulations. For premixed flames of hydrocarbons, HRR correlates well with the product of the relative species concentrations of formaldehyde (CH2O) and the hydroxyl radical (OH) [1]. Relative concentrations of these species can be imaged experimentally using planar laser-induced fluorescence (PLIF) to derive HRR and reaction zones by calculating the local product SCH2O × SOH of the corresponding PLIF-signals [2,3]. A generic SWQ-burner setup [4] with well-defined boundary conditions is used, where one branch of a V-shaped flame, stabilized on a ceramic rod, interacts with a water-cooled stainless steel wall.