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ExperimentalApparatus
„L-6” Twin-Jet Shear LayerWind Tunnel1
2
3
4
5
8
6
7
9
10
7
11
1 L-6 Wind Tunnel2 Smoke Generators3 Smoke Suction Unit4 Wing Profiles for Smoke Injection5 Power Supply for the Spray6 Spray Nozzle7 Honeycombs8 Water Tank9 Blowers
10 Screens + Foam Sheets11 Test Section
U1
High Velocity StreamU2
Low Velocity Stream
xy
z000
100
200
300
400
500
-150 -100 -50 0 50 100 150
85
50
Area of PIV Image
Recordings
85
50
Skipped PIV Positions
100
1003
550
Splitter Plate/SP/
Test SectionTest Section
VON KÁRMÁN INSTITUTE FOR FLUID DYNAMICSNr3)
Measurement TechniquesMeasurement Techniques
PIV /for single-phase flow/new PCO camera + NIKKOR 35mmnew PCO camera + NIKKOR 35mm
PTV(S) /for two-phase flow/Particle Tracking Velocimetry and Sizing
Size Discriminating (Size Discriminating (ddseedingseeding «« dddropletdroplet))Gas Phase Flow Field Data in TwoGas Phase Flow Field Data in Two--Phase FlowPhase Flow
Environmental and Applied Fluid Dynamics DepartmentFinal Public Presentation on 26th/06/2000
Turbulence Modulation Map
Environmental and Applied Fluid Dynamics DepartmentFinal Public Presentation on 26th/06/2000
Turbulence Modulation Map
Effect of Effect of characteristic length characteristic length scale ratioscale ratio on modulating on modulating turbulent intensity:turbulent intensity:
∆∆(T.I.) = (T.I.) = ff ((ddpp/l/lee))
ddpp -- particle diameterparticle diameterllee -- fluid length scalefluid length scale (integral (integral length scale or characteristic length of length scale or characteristic length of the most the most energetic eddy)energetic eddy)
T.I. of the fluid based on PIV and PTVS velocity meas.T.I. of the fluid based on PIV and PTVS velocity meas.
graph from [Gore and Crowe, 1989]graph from [Gore and Crowe, 1989]in Int. J. Multiphase Flowin Int. J. Multiphase Flow Vol.Vol.1515. No.2, pp.279. No.2, pp.279--285.285.
CHANGE in Turbulence Intensity CONCLUSIONSCHANGE in Turbulence Intensity CONCLUSIONS
Effect of Effect of characteristic length characteristic length scale ratioscale ratio on modulating on modulating turbulent intensity:turbulent intensity:
∆∆(T.I.) = (T.I.) = ff ((ddpp/l/lee))
ddpp -- particle diameterparticle diameterllee -- fluid length scalefluid length scale (integral (integral length scale or characteristic length of length scale or characteristic length of the most the most energetic eddy)energetic eddy)
T.I. of the fluid based on PIV and PTVS velocity meas.T.I. of the fluid based on PIV and PTVS velocity meas.
graph from [Gore and Crowe, 1989]graph from [Gore and Crowe, 1989]in Int. J. Multiphase Flowin Int. J. Multiphase Flow Vol.Vol.1515. No.2, pp.279. No.2, pp.279--285.285.