Simultaneous planar velocity measurements and OH imaging in a transverse jet flame

1998 ◽  
Vol 1 (1) ◽  
pp. 65-77 ◽  
Author(s):  
E. F. Hasselbrink ◽  
M. G. Mungal ◽  
R. K. Hanson
Keyword(s):  
Velocity Measurements ◽  
Jet Flame ◽  
Transverse Jet ◽  
Planar Velocity

Planar velocity measurements and OH imaging in a transverse jet flame

1997 ◽  
Author(s):  
E. Hasselbrink ◽  
M. Mungal ◽  
R. Hanson ◽  
E. Hasselbrink ◽  
M. Mungal ◽  
...  
Keyword(s):  
Velocity Measurements ◽  
Jet Flame ◽  
Transverse Jet ◽  
Planar Velocity

DROPLET SIZE AND VELOCITY MEASUREMENTS IN A CRYOGENIC JET FLAME OF A ROCKET-TYPE COMBUSTOR USING HIGH-SPEED IMAGING

2016 ◽  
Vol 26 (5) ◽  
pp. 411-438 ◽  
Author(s):  
Nicolas Fdida ◽  
Lucien Vingert ◽  
Arnaud Ristori ◽  
Yves Le Sant
Keyword(s):  
Droplet Size ◽  
High Speed ◽  
Velocity Measurements ◽  
High Speed Imaging ◽  
Jet Flame

Planar velocity measurements in compressible mixing layers

2001 ◽  
Vol 431 ◽  
pp. 189-222 ◽  
Author(s):  
WILLIAM D. URBAN ◽  
M. G. MUNGAL
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Transverse Velocity ◽  
Mixing Layers ◽  
Velocity Measurements ◽  
Turbulence Statistics ◽  
Strong Suppression ◽  
Planar Velocity ◽  
Component Velocity ◽  
Mach Numbers

In the present study, we use particle image velocimetry (PIV) to obtain planar, two-component velocity fields in two-dimensional, turbulent mixing layers at convective Mach numbers Mc of 0.25, 0.63, and 0.76. The experiments are performed in a large-scale blowdown wind tunnel, with high-speed free-stream Mach numbers up to 2.25 and shear-layer Reynolds numbers up to 106. Specific issues relating to the application of PIV to supersonic flows are addressed. The instantaneous data are analysed to produce maps of derived quantities such as vorticity, and ensemble averaged to provide turbulence statistics. The results show that compressibility introduces marked changes in the disposition of instantaneous velocity gradients within the layer, and hence in the vorticity field. In particular, peak transverse vorticity values are seen to be confined to thin streamwise sheets under compressible conditions, with little transverse communication. The location of these sheets near the lab-frame sonic velocity suggests a sensitivity of the compressible layer to stationary disturbances. Turbulence statistics derived from the planar velocity measurements confirm previous observations of strong suppression of transverse velocity fluctuations and primary Reynolds stress as Mc increases between 0.25 and 0.76.

Planar velocity measurements of a two-dimensional compressible wake

2003 ◽  
Vol 34 (3) ◽  
pp. 430-441 ◽  
Author(s):  
F. Scarano ◽  
B. W. Oudheusden
Keyword(s):  
Two Dimensional ◽  
Velocity Measurements ◽  
Planar Velocity

Analysis of Spatiotemporal Variations and Flow Structures in a Periodically Driven Cavity

2005 ◽  
Vol 128 (3) ◽  
pp. 413-420 ◽  
Author(s):  
S. Sriram ◽  
Abhijit P. Deshpande ◽  
S. Pushpavanam
Keyword(s):  
Reynolds Number ◽  
Plate Motion ◽  
Velocity Variation ◽  
Velocity Measurements ◽  
Square Cavity ◽  
Glycerol Water ◽  
Driven Cavity ◽  
Periodically Driven ◽  
Planar Velocity ◽  
Span Width

The time-dependent fluid flow in a square cavity was studied using model fluids of glycerol-water solution at different frequencies and amplitudes of motion of the top plate. The range of Reynolds numbers in our investigation varied from 5 to 3700. The experiments were carried out in a square cavity with a periodically driven lid, and planar velocity measurements were obtained using particle image velocimetry. The flow was driven by moving the top surface of the cavity in a simple harmonic motion. The aspect ratio, defined as the ratio of cavity length to the cavity height, is unity. The ratio of cavity spanwise width to the length of the cavity is 0.2. The temporal variation of velocity at fixed locations in the cavity exhibits a periodic variation. The basic frequency of the fluid motion at a point in the flow domain was observed to be the same as that of plate motion for low Reynolds number Re. However, existence of dominant secondary frequencies was observed along the central vertical plane. The velocity variation as a function of time at a fixed position and the velocity profiles along horizontal and vertical planes are also quantitatively described. These were compared to computational fluid dynamics (CFD) simulations based on the finite volume technique. Comprehensive details of the flow as a function of Reynolds number are analyzed. The evolution of secondary vortices at different plate positions as a function of Reynolds number is also presented. The planar velocity measurements acquired are indicative of the flow behavior in a periodically driven cavity with a narrow span width even at high Re. At very low Re, the flow throughout the periodically driven cavity qualitatively resembles the classical steady lid-driven cavity flow. At high Re, the entire cavity is occupied with multiple vortices. The qualitative features of the bulk flow observed are valid even for cavities with infinite span width.

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