Characteristics of flow field in dual-vortex-controlled radial staged combustor
In order to study the flow field characteristics of a newly designed dual-vortex-controlled radially graded combustion chamber,a combination of PIV tests was used to obtain the flow field structures,streamlines,flow velocity distributions and return zone characteristics of different spreading and streaming cross-sections of this type of combustion chamber at different pressure drops(1.5%～5.5% ).The results show that the combustion chamber forms a three-dimensional vortex coupling the spreading vortex and the flow vortex in the concave cavity;the externally rotating helical flow field after the cyclone of the main combustion stage forms a three-dimensional vortex sphere structure together with the center return zone;the concave cavity and the flow field of the main combustion stage couple with each other under the action of the main combustion orifice inlet.At the same time,under different pressure drops,there are two flow regimes in the cold flow field of the combustion chamber.When the pressure drop is less than 3.5%,the cyclone rotating airflow is significantly stronger than the concave cavity airflow,and the concave cavity airflow is pressed to the outer wall and outflow,which is difficult to mix with the main stream,and interacts with the main stream in the downstream of the flame tube;when the pressure drop is more than 3.5%,the cyclone rotating airflow is weakened,and the concave cavity airflow flows with the rotating airflow and interacts with each other,which is relatively easier to mix with the main stream.
radial staged combustordual-vortex-controlledflow field characteristicsvortex structureparticle imaging velocimetry(PIV)aero-engine
NETL
NSTL
万方数据
