抄録
The main objectives of the present study are: (1) to identify the dominant parameters responsible for the generation of unsteady flow, (2) to determine the conditions under which flow oscillations are produced and the relation between the flow characteristics and the number of vanes, and (3) to control the amplitude of the velocity fluctuation by means of tangential blowing. An attempt is made to clarify the flow instabilities downstream of the IGV by conducting experiments and a numerical simulation. The onset conditions, including the number of cells and the oscillation characteristics of the unsteady flow, are discussed based on the measured pressure and velocity fluctuations. The exit flow angle (α3) with identical solidity is presented as a function of the number of vanes. Furthermore, circular cylinders with tangential blowing are applied as IGV to generate the rotating flow. Flow characteristics downstream of circular cylinders with tangential blowing are discussed.
