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Experimental and Numerical Analysis of Flow in a Shock Wave Power Generator

This study explores the experimental and numerical analysis of flow in a Shock Wave Power Generator (SPG™), invented by James Griggs in 1993. Utilizing a reduced-scale clear acrylic model, the research aims to understand the complex flow mechanics driven by energy release from cavitation. Key methods employed include image de-rotation for enhanced visualization, alongside advanced computational fluid dynamics (CFD) using FLUENT 5. Experimental tests and numerical simulations reveal vortex formation, separation from walls, and recirculation areas, providing valuable insights into SPG™ operation and efficiency.

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Experimental and Numerical Analysis of Flow in a Shock Wave Power Generator

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  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

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