1. © 2010, TSI Incorporated Global Sizing Velocimetry (GSV)

2. © 2010, TSI Incorporated Global Sizing Velocimetry System

3. © 2010, TSI Incorporated GSV System The system includes –Optical and mechanical components and –INSIGHT 3G GSV module Size and VelocityFor Global measurement of Size and Velocity of spray droplets –Add GSV system components to a single camera PIV system

4. © 2010, TSI Incorporated Uniqueness of the GSV system InstantaneousInstantaneous Global measurements –Simultaneous droplet size and velocity measurements OptimalOptimal signal collection angle –Measures droplets of different refractive indices –Measures droplets with different characteristics – wide rangeGSV System can measure in wide range of test conditions –inhomogeneous droplets, reacting or burning droplets, and droplets of unknown refractive index SINGLESimple and easy extension of a SINGLE camera PIV system –To measure size and velocity simultaneously

5. © 2010, TSI Incorporated Uniqueness of the GSV system OptimalOptimal optical and image capture arrangement –Using a slit aperture allows maximum droplet concentration UniqueUnique processing algorithms –PM Windowed Algorithm for fringe analysis and velocity tracking POWERVIEW PlusGSV system can be used with all POWERVIEW Plus family of cameras SimultaneousSimultaneous display of size and velocity vector field CorrelationCorrelation of size and velocity

6. © 2010, TSI Incorporated Spray Analysis Global Spray Analysis and Geometrical Patternation Macro analysis of sprays Micro analysis of sprays Global Sizing Velocimetry System GSV

7. © 2010, TSI Incorporated Application Detailed Spray Diagnostics Global velocity to global size and velocity measurements –Easy add on with the GSV system The complete system (PIV and GSV) –Capable for Spray patternation for dense spray –Macro and Micro diagnostics of sprays Expand to do other global measurements –PLIF for combustion analysis –Scalar property measurements

8. © 2010, TSI Incorporated Features A global imaging system simultaneously –To measure droplet size and velocity simultaneously Employs –Generalized Scattering Imaging (GSI) approach based on the Lorenz-Mie theory and the Finely Stratified Sphere Scattering Model for droplet size Applicable to homogenous and inhomogenous –Both homogenous and inhomogenous (absorbing) droplets with varying refractive index Extension of a PIV system an add on –GSV system is an add on to a complete PIV system

9. © 2010, TSI Incorporated Principle for GSV system Light scattered by droplets –Characterized by strong angular oscillations Oscillation Pattern generates uniform angular spacing –Spacing - inversely proportional to the droplet diameter Defocused imaging provides – Angular spacing (sizing) information Image pairs with known time separation –Provides velocity measurement

10. © 2010, TSI Incorporated Characteristics of the GSV system Optimum Orientation (60 deg collection angle) –For imaging of the oscillation spacing –Insensitive to change in refractive index –Provides highest visibility signals Use of a slit aperture to capture images –Generates narrow string image pattern –Reduces overlap of oscillation pattern –And increases the measured number concentration of the droplets – Captures pairs of consecutive images –Operates as a PIV system to measure velocity Magnification obtained from calibration

11. © 2010, TSI Incorporated P OWER V IEW Camera Slit aperture Lens Pulsed laser Light sheet Liquid spray System Configuration

12. © 2010, TSI Incorporated Principle of Interferometric Oscillation

13. © 2010, TSI Incorporated Image capture through the slit aperture 1-D Intensity profiles

14. © 2010, TSI Incorporated Vertical scan Burst detection Freq analysis GSV - PM Sizing Algorithm

15. © 2010, TSI Incorporated Particle Identification in Two frames

16. © 2010, TSI Incorporated Velocity Measurement Two-frame tracking algorithm Uses both Size and Position –to match particles from the two image frames

17. © 2010, TSI Incorporated GSV – Size measurements

18. © 2010, TSI Incorporated Compensation for camera orientation

19. © 2010, TSI Incorporated Distribution of Measured Droplets

20. © 2010, TSI Incorporated Measured Diameter Histograms

21. © 2010, TSI Incorporated Measured Diameter Histograms

22. © 2010, TSI Incorporated Droplet distribution Variation with atomization pressure Large droplet Small droplet Pan et. al (2005)

23. © 2010, TSI Incorporated GSV – Spray Diagnostics A I F

24. © 2010, TSI Incorporated Velocity Distribution

25. © 2010, TSI Incorporated Size-Velocity Correlation

26. © 2010, TSI Incorporated GSV System InstantaneousInstantaneous Global measurements –Simultaneous droplet size and velocity measurements wide rangeGSV System can measure in wide range of test conditions –inhomogeneous droplets, reacting or burning droplets, and droplets of unknown refractive index SINGLESimple and easy extension of a SINGLE camera PIV system –To measure size and velocity simultaneously