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<p>This  thesis  compares  the  pin  stack  with  a conventional  rolled  stack  for  a thermoacoustic  prime  mover.  A pin  stack  is a new  geometry  for  stacks  used  in  thermoacoustic  engines  consisting  of  a lattice  of  small  wires  which  are  spaced  about  a thermal  penetration  depth  apart.  Computer  simulations  were  conducted  on  a variety  of  pin  stack  geometries  and  operating  parameters.  Results indicate  that  the  modeling  program,  DeltaE,  agrees  with  the  experimental  results  for  conventional  stacks,  that  the  pin  stack  decreases  viscous  energy  losses,  and  greatly  increases  the  efficiency  of  the  thermoacoustic  engine  over  a large  range  of  mean  pressures.  The  pin  stack  performance  was  found  to  be  more  sensitive  than  the  conventional  stack  to  changes  in  thermal  and  viscous  penetration  depths  of  the  fluid.
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<br>Subjects: NA</div>
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Nessler, F. Scott</div>
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