Thermoacoustic energy analysis of transverse-pin and tortuous stacks at large acoustic displacements |
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Authors: | Konstantin I Matveev |
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Affiliation: | 1. University of Toronto Institute for Aerospace Studies, Toronto, ON M3H 5T6, Canada;2. GE Global Research Center, Niskayuna, NY 12309, USA |
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Abstract: | A simplified method based on Rayleigh's criterion is developed for evaluating thermoacoustic power conversion in transverse-pin and tortuous stacks. Heat transfer and viscous losses are approximated by steady-flow correlations valid at large acoustic displacements with respect to a longitudinal pitch of a pin stack or a characteristic pore size of a random stack. A Lagrangian approach is employed to calculate temperature fluctuations of oscillating gas parcels inside the stack. A computational example is presented for a stack with an inline pin arrangement placed in a standing acoustic wave. Power conversion and efficiencies are evaluated for conditions relevant to a small-scale system. An indirect comparison is also made between theoretical results and experimental data for a prime mover with a wire mesh stack. |
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