Library Subscription: Guest
8th Thermal and Fluids Engineering Conference (TFEC)
March, 26-29, 2023, College Park, MD, USA

THE EFFECT OF AERODYNAMICS ON AIR BLAST ATOMIZER IN CO AND COUNTER ROTATING FLOWON SPRAY FLAMES

Get access (open in a dialog) pages 285-292
DOI: 10.1615/TFEC2023.cbf.046043

Abstract

An experimental investigation is carried out to demonstrate the effect of aerodynamics on the primary zone of combustion of a swirl-stabilised gas turbine combustor. The co and counter-rotating effect is produced by changing the flow rotating direction of combustion air with respect to atomising air. The atomising air and combustion air are calculated using a fixed air-to-liquid ratio (ALR = 2) and an equivalence ratio (φ) of 0.5. The current study signifies the effect of swirl number variation on sprays and combustion stability. Spray morphology is diagnosed by Structured Laser illumination planner imaging (SLIPI) technique for different swirl numbers and swirl geometry (i.e. Co and Counter rotating flow). The chemiluminescence imaging is acquired to investigate the reaction zone and flame morphology. More combustion air can be entrained into the spray by placing the convergent nozzle axially ahead of the air blast injector, which helps to stabilize the flame. SLIPI imaging illustrates the higher liquid droplet intensity at the central recirculation zone in a counter-rotating flow configuration, which leads to a larger volumetric heat release rate. Hence, counterrotating flow geometry exhibits a broader range of combustion stability than co-rotating flow.