Study of supersonic flow issuing from annular nozzle

In this paper, it aimed to clarify that exit shape of an annular nozzle which is applied in various fields in industry affects a flow field of a supersonic jet flow. The annular nozzles are three kinds of exit shape on the exit point. A small hole is installed in the center part of the annular nozzles and it is clarified that pressure on the exit part of the annular nozzles affects the flow which comes from the small hole. In this report, the flow filed of the annular supersonic flow is clarified by experiment and numerical analysis. In the experiment, it is clarified that the pressure vibrations of the supersonic jet flow issuing from an annular nozzle influences a flow field. In the numerical analysis, they are clarified about the flow situation of the vicinity of the nozzle exit, the position of the separation point of the flow, and the vortex formed on the low-pressure region. Moreover, they are clarified about the change of flows, the movement of separation points, the change of vortex areas according to pressure decrease, and the influence from pressure vibrations to a flow arrorcling to changing exit. ehano of nn7z1es and stagnation pressure