Self-adaptive surface for boundary layer control and working method thereof

Abstract

The invention discloses a self-adaptive surface for boundary layer control and a working method thereof. The self-adaptive surface comprises a flexible deformable surface, a deformation control deviceand a supporting structure body. The flexible deformable surface is formed by in-situ forming of a polymer matrix containing uniformly dispersed spherical scattering bodies on a supporting structurebody. The deformation control device comprises an ultrasonic phased array composed of piezoelectric microphones, a driving unit, a power amplification unit and an impedance matching unit. The supporting structure body provides a mounting platform for the flexible deformable surface and the deformation control device, and a fixing device is arranged on the back of the supporting structure body, sothat the supporting structure body is conveniently connected with a target object. A high-flexibility and high-precision implementation mode is provided for control over formation of a boundary layerwhen air makes contact with the solid wall surface, the structure is simple, use is convenient, intelligent control over the pneumatic shape can be achieved, and the efficiency of an injection systemis optimized.

Description

technical field [0001] The invention belongs to the technical field of flow field control, and in particular relates to an adaptive surface for boundary layer control and a working method thereof. Background technique [0002] When the airflow flows through the wall at a large Reynolds number, a boundary layer with non-negligible viscous force is formed near the wall. In this thin flow layer, the fluid close to the wall adheres to the surface of the object, and the velocity of the fluid increases gradually in the direction away from the wall until it is equal to the free flow velocity. In engineering, the method of controlling the boundary layer can be used to make the entire flow develop in a specific direction, thereby adjusting the resistance acting on the objects in the flow field. The problem of boundary layer control has attracted widespread attention in many engineering applications. For example, the air flow separation on the blades of turbo pumps, compressors, pro...

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Problems solved by technology

[0003] In order to overcome the problems existing in the above-mentioned prior art, the object of the present invention is to provide an adaptive surface for boundary layer control and its working method, which solves the problem that the current boundary layer control technology is difficult to dynamically adjust the boundary layer according to the incoming flow velocity, and cannot Larger flow velocity range adjusts the aerodynamic resistance problem. On the basis of real-time measurement of the incoming flow velocity, the expected development of the flow field is realized by adaptively adjusting the wall configuration, and the resistance of the structure in the flow field is controlled.

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