Air discharge device

An air discharge device comprising:

• an air discharge unit configured to discharge air, wherein
• the air discharge unit includes
• at least one main hole from which an air flow is blown out as a working air flow,
• at least one auxiliary hole provided around the main hole to blow out a support air flow for suppressing an air suction action of the working air flow blown from the main hole, and
• a vortex suppression structure configured to suppress a development of lateral vortices generated in a velocity boundary layer of the working air flow at a downstream side of an outlet of the main hole,
• the vortex suppression structure is configured to make a central portion of the thickness of the velocity boundary layer of the working air flow formed at the downstream side of the outlet of the main hole to be closer to a mainstream of the support air flow at the downstream side of the outlet of the main hole,
• the air discharge unit further includes an overlapped structure in which a part of the main hole and at least a part of the auxiliary hole overlap with each other in a circumferential direction centered on a center line of the main hole, and
• the vortex suppression structure includes the overlapped structure.