An Adaptive Surface for Boundary Layer Control and Its Working Method

Abstract

The invention discloses an adaptive surface for boundary layer control and a working method thereof. The adaptive surface comprises a flexible deformable surface, a deformation control device, and a supporting structure; the flexible deformable surface consists of uniformly dispersed spherical scatterers The polymer matrix is ​​formed in situ on the support structure; the deformation control device includes an ultrasonic phased array composed of piezoelectric microphones, a drive unit, a power amplification unit and an impedance matching unit; the support structure is a flexible deformable surface and deformation control The device provides an installation platform with a fixing device on its back, which is convenient to connect with the surface of the target object in contact with the air; the present invention provides a highly flexible and high-precision embodiment for the control of the boundary layer formed when the air contacts the solid wall surface , simple structure, easy to use, can realize the intelligent control of the aerodynamic shape, and optimize the performance of the injection system.

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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