Apparatus and method for generating a ring vortex forming impact jet and turbomachinery with such a device

摘要

The invention relates to a device and a method for generating a ring vortex (7) forming impact jet (P). The device comprises at least one fluidic switching element (1, 1 ') which comprises: an input branch (2) having an inlet opening (21) via which cooling gas (G) can be supplied to the fluidic switching element (1); at least two output branches (31, 32) formed downstream of the input branch (2) and each terminating in an output port (8); a branch (4), at which the input branch (2) divides into the at least two output branches (31, 32); and control means (31, 32, S) for controlling the cooling gas (G) flowing in the input branch (2) such that the cooling gas (G) is alternately directed into one or the other of the output branches (31, 32), in each of them Output branch (31, 32) with a frequency (f) pulsating collision beam (P) is generated. In this case, the fluidic switching element (1) is designed and provided to deliver cooling gas at the outlet openings (8) at a mean outflow velocity (u) and a frequency (f) such that the impact jet (P) emerging from the outlet openings (8) 7) is formed. The invention further relates to a turbomachine with such a device.