Numerical and experimental investigation of turbulent n-heptane jet-in-hot-coflow flames

A turbulent n-heptane jet flame in a jet-in-hot-coflow burner is numerically and experimentally investigated, revealing distinct features of this fuel burner. The RANS k-? turbulence model adopted combination with dynamic partially-stirred reactor (PaSR) combustion model. simulation results are used to support newly-obtained experimental measurements mean temperature, OH number density normalised CH2O-PLIF signal values at several axial locations. simulations capture the transitional phenomenon observed for low coflow oxygen concentration case, which determined be due two chemical pathways exist fuel. predicted weak-to-strong transition heights based on streamwise (axial) gradient show non-monotonic behaviour. Furthermore, an investigation negative heat release rate region shows that absolute value increases reduced content, contrast suppression seen laminar opposed-flow flames.