An ejector using a swirl flow includes an ejector body comprising a main inlet into which a main flow in high pressure flows, a nozzle section in fluid communication with the main inlet, a mixing portion in fluid communication with the nozzle section, a diffuser in fluid communication with the mixing portion, and a discharge portion in fluid communication with the diffuser; and a suction pipe inserted in a center of the ejector body, the suction pipe including a through-hole into which a suction flow in low pressure flows, and a leading end portion an outer surface of which forms a plurality of inclined passages with the nozzle section of the ejector body, the plurality of inclined passages allowing the main flow to be moved to the mixing portion so as to form a swirl flow, wherein the main flow entering through the main inlet of the ejector body and the suction flow entering through the through-hole of the suction pipe are swirled and mixed in the mixing portion of the ejector body, and then are discharged outside through the diffuser and the discharge portion.

A fluid flow device including a plurality of fluid flow functional modules each fastened on a respective individual base includes: two parallel lateral faces via which the bases are adapted to be placed against one another; a primary channel passing through the base to open out in its two lateral faces; a front face along which the module extends so as to couple an inlet channel of said module with a secondary channel extending in the base; a check valve closing the secondary channel when the base is not provided with a module; and a top face in which there extends a tertiary channel opening out in the primary channel. The device further includes a fastener for fastening the bases to one another, leaktight couplers for coupling the primary channel and the tertiary channel to a source of fluid under pressure.