Turbulence structure on the surface of high speed liquid jet

• The structures on the surface of high-speed capillary liquid jet were captured with the help of high-speed camera and microscope. Apower spectral density method is used to deal with the jet images. Based on captured jet image, the variation of surface structures near the exit of the nozzle is divided into three sections: laminar section, instability section and turbulence section. There is no clearly surface structures in the laminar section. The wave-like structures come out in the instability section with a sudden and are regularly increase with a small slope along the streamwise. The degree of order is rather weak in the turbulence section. The increase of the Reynolds numbers which based on the momentum thickness at the exit of the nozzle will accelerates the jet surface transition from the laminar section to turbulence section.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

High-speed camera

Liquid jet

Power spectral density method

Surface wave

Cameras

High speed cameras

Jets

Liquids

Nozzles

Reynolds number

Spectral density

Surface structure

Surface waves

Turbulence

Degree of order

High Speed

Jet surfaces

Liquid jets

Momentum thickness

Turbulence structures

Fighter aircraft

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