| Popis: |
As one of the most effective structures of flame stabilizer, cavity owns an important position in scramjet combustor research, especially the tandem dual-cavity, which has a remarkable advantage in promoting fuel airmixing and flame stability.In this paper,flow field characters of dual-cavity scramjet combustor were analyzed in details without and with combustion. The results show that, under the interaction of cavity flow and fuel injection, two sizes of vortexes were formed in the upstream cavity after combustion. The bigger vortex provides a stable flame and the smaller one protects the upstream cavity back wall from heat in a certain extent. Additionally, the unburned fuel was blew away to the downstream cavity for a further combustion as soon as it meets high-speed main stream, which is helpful to improve combustion efficiency and to make the scramjet combustor shorter. And the mass of kerosene drifted into cavities was determined by fuel-jet velocity, whichwould have an indirect effect on the combustion efficiency. |
