The Experiment Model about Interference of Swirling Backflow of a Turbomachine and Bend type Inlet

The present paper describes the experimental results of the influence of a bend type inlet on the swirling backflow by using the backflow model test rig. The backflow is generated by using a swirler with zero stagger blades. The backflow regions were observed by using a hydrogen bubble method. It can be confirmed that the vortex occurred at random intervals, by taking a picture of swirling backflow vibration with a high-speed camera. The vortex greatly grew up in the direction of the radius when the swirling backflow developed to the upstream.