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Flow control method for cylinder with two symmetric flexible plates

A flow control, flexible board technology, applied in the direction of fluid flow, mechanical equipment, etc., can solve the problem of little flow control state research, and achieve the effect of suppressing vortex shedding and reducing lift resistance

Inactive Publication Date: 2016-05-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the studies on the flow control of blunt bodies are based on the introduction of a single flexible body, and few studies have been conducted on the flow control state after the introduction of more than one flexible body

Method used

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  • Flow control method for cylinder with two symmetric flexible plates
  • Flow control method for cylinder with two symmetric flexible plates
  • Flow control method for cylinder with two symmetric flexible plates

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Embodiment Construction

[0023] Please refer to figure 1 As shown, the method for controlling the flow of a cylinder with two symmetrical flexible plates in the present invention determines the optimal control variable by adjusting the stiffness and hinge angle of the flexible plates. The flexible plate will deform under the action of the surrounding flow field. It includes the following steps:

[0024] (1) For a fixed cylindrical structure, two flexible plates forming a certain angle α are hinged at the circumference of its cross section;

[0025] (2) The flexible plate will deform under the action of the surrounding flow field. The position vector of the flexible plate is defined as X(s, t), and the mathematical expression of its deformation is:

[0026] ρ s ∂ 2 X ∂ t 2 - ∂ ...

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Abstract

The invention discloses a flow control method for cylinder with two symmetric flexible plates. The two flexible plates are mounted on the circumference of the cross section of a cylinder, the mass ratio and lengths of the fixed flexible plates are given, the rigidity of the flexible plates and the angle between the hinge positions of the flexible plates are adjusted, and therefore the aims of reducing cylinder lifting resistance and restraining vortex shedding are achieved.

Description

Technical field: [0001] The invention relates to a cylindrical flow control method with two symmetrical flexible plates, which belongs to the field of fluid dynamics. Background technique: [0002] The problem of flow around blunt bodies can often be encountered in engineering practice, such as the flow of wind around various buildings, the flow of river water through bridge piers, and the design of various aircraft. When a fluid with a certain speed flows through a bluff body, vortex shedding occurs at the tail of the bluff body. The shedding of the vortex will make the surface force of the blunt body appear asymmetrical. If the blunt body is elastically supported, the blunt body will vibrate. The vibration phenomenon of blunt bodies is a common phenomenon in the field of practical engineering, and can cause structural collapse and even catastrophic accidents under unfavorable conditions. In order to avoid these accidents, it is very necessary to suppress the wake vortex ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15D1/00
CPCF15D1/006
Inventor 吴杰吴晶詹佳普
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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