1. An Experimental and Numerical Analysis of Flow in a ShockWave Power Generator™ Nicholas Doherty Dr. T. J. Scanlon Dr. M. T. Stickland University of Strathclyde

2. Introduction to SPG™ Invented by James Griggs, patented 1993 Attempts to harness the energy release from cavitation Flow mechanism present is not yet understood

3. Reduced Scale Clear Acrylic Model Model made entirely of clear acrylic Large cubic/cylindrical holes to assist visualisation All other important dimensions remain to scale

4. Image De-rotation Image de-rotation allows a stationary view of a rotating component De-rotator mirrors rotate at half the speed of the rotating object Reveal relative flow hidden by dominant primary flow field

5. Experimental Set-Up

6. Experimental Equipment

7. Numerical Analysis FLUENT 5 CFD software Moving Reference Frame method Standard form of k-  model SIMPLE algorithm for pressure-velocity coupling Second order upwinding for convection terms for momentum Steady State and Transient solutions solved

8. PIV Results Tests taken at 1,000 rpm Evidence of vortex formation Separation from inside wall and area of recirculation

9. CFD Results Reasonable correlation with PIV results Vortex formation in hole Separation from inside wall and recirculation area