Bidirectional active-control downstream fluid excitation device

Abstract

The invention belongs to the field of fluid excitation devices and discloses a bidirectional active-control downstream fluid excitation device. The fluid excitation device comprises a wing, as well as one or more air inlet holes, one or more air outlet holes, sealed air chambers, and an air delivery driving device which are arranged on the wing, wherein the air inlet holes are formed in the leading edge area of the upper surface of the wing; the air outlet holes are formed in the trailing edge area of the upper surface or/and the lower surface of the wing; the sealed air chambers and the air delivery driving device are arranged in the wing and are connected with each other to form an air passage; and an air stream is sucked in from a downstream ends of the air inlet holes by the air delivery driving device, passes through the air passage and blows out from the air outlet holes. The fluid excitation device is practically applied to a wing profile of an independent entity; besides, the combination of slot suction with closed-loop control is used to provide lift force and reduce resistance; the fluid excitation device is simple in structure; and industrialized production of the fluid excitation device can be realized.

Description

technical field [0001] The invention relates to a fluid actuation device, in particular to a bidirectional active control downstream fluid actuation device. Background technique [0002] Delayed flow separation by steady suction was first started in 1904, when Prandtl demonstrated the theory of boundary layers, the rotational flow of the boundary layer was removed by narrow suction grooves located on the surface of the cylinder, thus in most of the cylinder The flow remains attached to the surface. Ackeret, Betz & Schrenk applied this idea to thick airfoils of the Joukowski type, reducing drag by delaying separation through the flow of suction, and was also cited by Lachmann. This method of slot suction is used on different airfoils and with different flaps to enhance lift, but the suction volume involved is too high (1% < C Q <3%), and cannot be popularized to practical applications. Even though surface and multi-slot suction are still considered valuable methods f...

AI Technical Summary

Problems solved by technology

This method of slot suction is used on different airfoils and with different flaps to enhance lift, but the suction volume involved is too high (1% Q <3%), and cannot be popularized for practical application

Even though surface and multi-slot suction are still considered valuable methods for maintaining laminar flow at high Reynolds numbers, airfoils thinned to reduce drag at high speeds make it necessary to remove low-pressure external fluids. Larger piping applications within the more restricted

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