Cinematic PIV of a turbulent free shear layer

Oakley, Thomas R.; Loth, Eric; Adrian, Ronald J.

doi:10.2514/6.1994-2298

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present work length scales are estimated based on the distances at which the correlation values drop to 1/e of the peak value (Oakley, 1995). A plot of the length scales, ux l and uy l (from correlation of u' along x and y directions respectively) at different streamwise locations in the shear layer of nozzle jet and orifice jet is shown in Fig.…”

Section: Two-point Spatial Correlationmentioning

confidence: 99%

See 1 more Smart Citation

PIV studies of large scale structures in the near field of small aspect ratio elliptic Jets

Ramesh

Venkatakrishnan

Prabhu

2006

J Vis

View full text Add to dashboard Cite

The near flow field of small aspect ratio elliptic turbulent free jets (issuing from nozzle and orifice) was experimentally studied using a 2D PIV. Two point velocity correlations in these jets revealed the extent and orientation of the large scale structures in the major and minor planes. The spatial filtering of the instantaneous velocity field using Gaussian convolution kernel shows that while a single large vortex ring circumscribing the jet seems to be present at the exit of nozzle, the orifice jet exhibited a number of smaller vortex ring pairs close to jet exit. The smaller length scale observed in the case of the orifice jet is representative of the smaller azimuthal vortex rings that generate axial vortex field as they are convected. This results in the axis-switching in the case of orifice jet and may have a mechanism different from the self induction process as observed in the case of contoured nozzle jet flow.

show abstract

Section: Two-point Spatial Correlationmentioning

confidence: 99%

“…Renewed interest in determining the correlation function has mainly arisen from its use as inputs for coherent structures. Oakley et al (1995) used a cinematic PIV system to obtain the two-point correlation in a turbulent free shear layer.…”

Section: Introductionmentioning

confidence: 99%