Analysis of the quenching behavior in impinging flame: Flow and thermal characteristics

Abstract

Considering the complex phenomenon of in-cylinder flame impingement occurring in internal combustion engines, flame-wall interaction in different impinging distance cases is presented for the non-premixed impinging flames. In this article, the quenching mechanism of impinging flame is focused on using experiments and numerical simulations. The quenching information on the flow and thermal field is obtained in the experiment. Large Eddy simulation is used to provide the details in the flow characteristics. In the wall jet region, multiple vortexes are formed accompanied by strong turbulence and large wall shear stress, which becomes more significant with the increase of the impinging distance. The low-temperature region corresponds to a large wall heat flux and Nusselt number, and this non-positive correspondence between temperature and heat transfer leads to excessive heat loss and weakens the flame stability. The quenching behavior in the impinging flame is analyzed in terms of the flow field and thermal characteristics.