Spray ignition and blow-out boundary of centrally staged annular combustor

An experimental study of an annular model combustor was conducted to investigate spray ignition and blow-out problems in a centrally staged annular combustor. In the annular model combustor composed of 16 centrally staged injectors, the spray ignition and blow-out process of aviation kerosene RP-3 was experimentally studied under atmospheric temperature and pressure. Within the range of 0.5%–3% of the pressure drop in the combustor, with the increase in the pressure drop, the fuel-air ratio of the ignition boundary first decreases and then increases, while the fuel-air ratio of the blow-out boundary gradually decreases and then remains constant. The research results show that the lean oil ignition boundary of the annular combustor can be significantly improved by installing the flow deflector at the injectors. The ignition and blow-out process of the annular combustor is recorded with a digital single lens reflex. The circumferential propagation of flame is similar under different pressure drops, and the flame propagation is circumferential asymmetry. The blow-out sequence of the injector is related to the fuel uniformity.