Experimental investigation of central jet displacements on the turbulence and gas dynamics of a coaxial burner

Isothermal turbulent flow issued by a coaxial burner that consists of three jets is experimentally studied. In this investigation different configurations that depend on the central jet displacement are examined. The offset varies between −30 mm and +30 mm using a step of 10 mm. The central and the outer jets provide pure oxygen whereas the in-between jet bears fuel. Various profiles of mean axial and radial velocity, fluctuations, intensity of turbulence and turbulent kinetic energy are carried out using the Particle Image Velocimetry (PIV) technique. The obtained results describe the behavior of the isothermal turbulent flow for each test case. These results show that the inner core depends on the central jet displacement. The main objective of this investigation is to better understand the dynamics of coaxial burner and provide a reliable data for the numerical validation of stratified combustions.