New results on grid-generated turbulence

• To experimentally study the receptivity of laminar boundary layers to free stream turbulence, the use of grids is the simplest and most effective way to generate turbulence. To investigate the receptivity it is essential to be able to vary the parameters of the free stream turbulence such as turbulence level and length scales. By altering the distance of different grids from the receptivity region, these parameters can be adjusted independently.In the current experimental setup seven grids with mesh widths (M) in the range of 0.95 − 50 mm were studied with two X-probes. The grids were characterized in terms of kinetic energy decay, integral turbulent length scale (both streamwise and transverse), Kolmogorov and Taylor scales, power spectra, dissipation and level of anisotropy.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering (hsv//eng)

Nyckelord

Engineering mechanics

Teknisk mekanik

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)