INSA Rouen, France
Bruno Renou is currently professor in the Department of Energy and Propulsion of INSA Rouen Normandie, France. He received a Doctoral degree in Combustion Science from the University of Rouen in 1999. Currently, his research activities are related to Laser Diagnostics (PIV, Laser-induced Fluorescence, Rayleigh scattering), Gas Turbine Combustion and Internal Combustion Engine (Fuel/air mixing, pollutant emissions, spray evaporation) and Combustion Science (Structure of premixed and stratified flames, thermal diffusion effects, flame stabilization mechanisms, ignition). He has authored or co-authored 50 papers in peer-reviewed journals and more than 80 scientific publications presented in international conferences. He is member of the Editorial Board of Combustion and Flame journal since 2015, and he has served as Colloquium Co-Chair for the International Symposium on Combustion in 2014, 2018 and 2020.
Spray flames exhibit a complex interaction between droplets, turbulence, and combustion, leading to the formation of hybrid structures containing premixed, partially premixed, and diffusion flame branches. The droplet-flame interaction may also lead to local extinctions and heat release rate perturbations. These complex phenomena affect the formation of Nitric Oxide (NO) which is highly sensitive to the mode of combustion, residence time, and temperature. Quantitative instantaneous and mean NO mole fractions are evaluated in a n-heptane jet spray flame using NO-PLIF. The LIF temperature-quenching sensitivity is reduced through the optimized Q1(29.5) excitation. This optimization is achieved by simulating the LIF signal for different excitation schemes with temperature and gas composition obtained from the spray flame LES data (AVBP code). LIF model and LES data are also used to incorporate the temperature-quenching LIF correction in the spray flame. To reduce PAH and soot interferences, the NO-LIF detection strategy is optimized by imaging LIF in different spectral ranges. Various insights are derived from the instantaneous NO mole fraction distribution in the complex (local extinctions, PAH, and sooting regions) spray flame. These new results are used also to complete the Jet Spray Flame database which is a part of the TCS workshop (http://tcs-workshop.org/). The species measurements will contribute towards the validation of kinetic schemes mechanisms used in a numerical simulations.