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An aerodynamic body with an aerodynamic body surface that creates a contoured surface for a fluid to stream around, with a device to influence the flow of the fluid streaming around the aerodynamic surface. The flow-influencing device includes a passage to link the fluid streaming around the aerodyn

An aerodynamic body with an aerodynamic body surface that creates a contoured surface for a fluid to stream around, with a device to influence the flow of the fluid streaming around the aerodynamic surface. The flow-influencing device includes a passage to link the fluid streaming around the aerodynamic surface with an actuator space of an aspirating and purging device situated in the aerodynamic body, and an indentation that is situated next to the passage, which is formed by a recessed section of the aerodynamic surface on a flow-influencing region within the contoured surface of the aerodynamic surface, so that a boundary wall is configured as part of the recessed surface lying opposite the indentation. The aspirating and purging device can generate a swirl in the flow of the fluid streaming around the aerodynamic surface, the rotational axis of which is directed along the assumed aerodynamic body chord direction.

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1. An aerodynamic body with an aerodynamic surface that creates an aerodynamic contoured surface for a fluid to stream around, and with at least one flow-influencing device to influence the flow of the fluid streaming around the aerodynamic surface, wherein the flow-influencing device comprises: a p

1. An aerodynamic body with an aerodynamic surface that creates an aerodynamic contoured surface for a fluid to stream around, and with at least one flow-influencing device to influence the flow of the fluid streaming around the aerodynamic surface, wherein the flow-influencing device comprises: a passage running along a direction of an aerodynamic body thickness and into the aerodynamic body, the passage being configured to periodically aspirate and purge a fluid therethrough,an indentation disposed in the direction of the aerodynamic body thickness between the passage and the aerodynamic contoured surface, the indentation extending along a direction of an aerodynamic body wingspan, wherein the indentation is disposed in a direction of an aerodynamic body wingspan such that the passage is located at an end of the indentation in the direction of the aerodynamic body wingspan, which indentation is formed by a recessed section of the aerodynamic surface beside the passage and by a boundary wall, which boundary wall together with the recessed section defines the indentation wherein the passage is located, in the aerodynamic wingspan direction, between the boundary wall and the recessed section,wherein periodically aspirating and purging of the fluid through the passage generates an asymmetrical flow state providing a swirl in the flow of the fluid streaming around the aerodynamic surface, the swirl being provided over portions of the passage and the indentation, and the swirl having a rotational axis directed along a direction of an aerodynamic body chord. 2. The aerodynamic body according to claim 1, wherein an area of transition between the boundary wall and the aerodynamic contoured surface has an edge line. 3. The aerodynamic body according to claim 1, wherein a portion of the recessed section is angled with respect to the aerodynamic contoured surface as viewed in the aerodynamic body wingspan direction, such that a portion of the recessed section slopes downward toward a mouth of the passage, away from the aerodynamic contoured surface as viewed from the latter. 4. The aerodynamic body according to claim 1, wherein a plurality of arrangements comprised of a respective passage and an indentation are situated adjacent to each other and spaced apart from each other as viewed in the aerodynamic body wingspan direction, wherein combinations of the indentation and the passage are each alternately oriented oppositely relative to each other as viewed in the direction of the aerodynamic body wingspan. 5. The aerodynamic body according to claim 1, wherein the aspirating and purging device comprises a membrane actuator that at least partially borders an actuator space of the latter, and is configured in such a way that a volume of the actuator space can be increased and decreased by correspondingly activating the membrane actuator, wherein decreasing the actuator space volume purges fluid through the passage, and increasing the actuator space volume aspirates fluid through the passage. 6. A structural component for an aircraft, a land-bound vehicle or a water craft, with a structural component configured as an aerodynamic body designed according to claim 1. 7. The aerodynamic body according to claim 1, wherein the aerodynamic surface comprises a plurality of arrangements comprised of a respective passage and an indentation. 8. The aerodynamic body according to claim 7, wherein the plurality of arrangements comprised of the respective passage and the indentation are situated consecutively and spaced apart from each other as viewed in the aerodynamic body chord direction, wherein combinations of the indentation and the passage share an identical orientation as viewed in the direction of the aerodynamic body wingspan. 9. The aerodynamic body according to claim 1, wherein the aspirating and purging device comprises a flow-generating device that operatively interacts with an actuator space of the aspirating and purging device in such a way that fluid is alternately purged through the passage and aspirated through the passage periodically when the flow-generating device is correspondingly activated. 10. The aerodynamic body according to claim 9, wherein the flow-generating device comprises a rotary piston pump and/or an intermittently operating piston pump. 11. A regulating flap or main wing or fin of an aircraft designed according to claim 1. 12. The regulating flap or main wing or fin of an aircraft according to claim 11, wherein a plurality of arrangements comprised of a respective passage and an indentation are situated in a rear half of the aerodynamic surface as viewed in the direction of the aerodynamic body chord.