Gewellter Beschichtung und Verfahren zur Auswahl der Beschichtungsparameter

Details

Veröffentlichungs-Nr.

EP4733604

Anmeldetag

30. September 2025

Veröffentlichung

29. April 2026

Rechtsraum

EP

IPC

F15D1/12(SIROVICH LAWRENCE et al.)

Abstract

The invention concerns a thin, corrugated skin coating for controlling the turbulent boundary layer developing on a surface of an aerodynamic body, particularly in areas characterised by a high risk of flow separation, which coating enables effective reduction or complete elimination of turbulent separation at high Reynolds numbers. The invention concerns a thin skin coating that comprises an active section consisting of a corrugated surface that modulates the turbulent boundary layer, and an adhesive section that enables installation of the coating on a physical body providing resistance when there is relative motion between the body and a viscous fluid. Examples of such objects include wind turbine blades. A method for selecting parameters of the coating, characterised in that it comprises the following steps: determining the local Reynolds number Re_τ, identifying the starting point for installation of the corrugated coating, selecting the coating corrugation amplitude so that it rises above the surface by 3% to 4% of the boundary layer thickness. selecting the corrugation wavelength of 15 x the amplitude, taking into account local flow conditions such as a deviation of the flow direction, caused, e.g., by a centrifugal force resulting from the rotational motion of a blade or from the shape of the body surface of a moving vehicle. The surface skin coating for turbulent flow control, whose parameters are determined according to the method described in claims 1-2, is characterised in that its thickness ranges from 0.1 mm to 15 mm, it has on one side a corrugated, in at least one direction, technically smooth surface, and the amplitude is 5% to 6% of the thickness of the turbulent boundary layer developing at the location where the coating is installed.

Anmelder

Firma

Politechnika Czestochowska

Land

🇵🇱 Polen

Fachgebiete