A Direct Numerical Simulation study of a turbulent lifted flame in hot oxidizer

Abstract

This paper presents a Direct Numerical Simulation (DNS) study of the stabilisation of a turbulent lifted flame in hot oxidizer, a problem of practical significance in diesel engines, gas turbines, and recirculating industrial burners. A slot jet of fuel issuing into a hot co-flow oxidizer stream is simulated using a single-step chemistry model and assuming unity Lewis number. A jet Reynolds number of 5,300 was enabled by the use of scalable high-order numerical methods and highly parallel computation. The basic structure of the flame is described noting features of the flame base and trailing premixed and diffusion flames. The flame base is studied to determine whether the stabilisation is d..