Active drag reduction method for flapping wing wake flow control of underwater vehicle

Abstract

The invention relates to an active drag reduction method for flapping wing wake flow control of an underwater vehicle, and belongs to the technical field of drag reduction of underwater vehicles. Themethod comprises the following steps that S1, the navigation speed U0 and the section diameter D of the underwater vehicle are obtained, and the local Reynolds number Re of the vehicle is solved; S2,according to the feature size, namely the section size, of the aircraft, an NACA symmetric airfoil profile with the chord length C being equal to D is selected; S3, the devortex frequency F of a corresponding section cylinder is calculated according to the Reynolds number; the flapping frequency f is selected, so that the value range of the flapping wing dimensionless flapping frequency Sr = fC / U0is [01], and f = F is avoided; the up-and-down oscillation amplitude A is [0.1 C-1.0 C]; S4, the installation distance L of the flapping wing device is set to be 0.5 D, and the flapping wing device is installed at the axis position of the aircraft; the motion of the flapping wing device is controlled by setting parameters of the flapping wing device and setting the control rate. The method is wide in optional parameter range and high in drag reduction performance, can be used as a fin rudder and is high in versatility.

Description

technical field [0001] The invention belongs to the technical field of drag reduction of underwater vehicles, and in particular relates to an active drag reduction method for flapping wing wake control of underwater vehicles. Background technique [0002] At present, for the drag reduction methods of revolving underwater vehicles such as torpedoes and gliders, technologies such as supercavitation, grooved surface, flexible wall surface, superhydrophobic surface, microbubbles, and polymer additives are often used. [0003] Supercavitation technology is generally used in high-speed operating conditions, and its controllability is poor; the cavitation structure on the superhydrophobic drag reduction surface is prone to damage under the action of water pressure, so it is not suitable for underwater drag reduction. The drag reduction efficiency of the trench drag reduction method is relatively poor, and the trench is easily attached by marine organisms and loses the drag reductio...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of uncontrollable deceleration timing in the existing methods, the present invention proposes an active drag reduction method for flapping wing wake control of underwater vehicles

It makes up for the vacancy of existing underwater drag reduction technology without active drag reduction methods and the defect that passive drag reduction technology is prone to failure

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