Investigation of the nonreactive flow in a swirling burner/Tekejimo be atgalines reakcijos sukuriniame degiklyje tyrimai

An experimental investigation method--Particle Image Velocimetry (PIV) and a numerical investigation method--Large Eddy Simulation (LES)--is performed on a swirl burner. Due to the strong influence of the fluid dynamics that controls mixture formation and chemical reactions the present study focuses on studying nonreacting jet. Velocity magnitude, axial velocity and stream path are investigated in instantaneous and mean flow. Comparisons are made between instantaneous velocity field and time-averaged velocity field over 80 consecutive frames in PIV case and 22500 consecutive time steps in the numerical case. There are some differences due to the highly non-stationary behavior of the swirling flow. The results from numerical simulation are compared to the results obtained through PIV diagnostic measurements. Both, in numerical simulation and in experimental results, a central recirculation zone appears. This zone is maintaining own aspect over all the measurement time. From quality point, the velocity values together with mean velocity are in agreement with measurement data.