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Methods to focus acoustic energy of a thermoacoustic engine.

Author(s) : SUN D. M., QIU L. M., WANG B., et al.

Summary

A well designed transfer line has been verified to be able to amplify the output pressure amplitude of a thermoacoustic engine, which offers a feasible way to focus acoustic energy of the engine to its load. Some transmission characteristics of acoustic amplifiers are studied based on linear thermoacoustic theory. Furthermore, a novel cascade acoustic amplifier and a Helmholtz resonator are proposed, which show strong amplifying ability. In the experiment, a two-stage cascade acoustic amplifier amplifies the pressure ratio from 1.177 to 1.62 and produces a pressure amplitude of 0.547 MPa with nitrogen of 2.20 MPa as the working gas. A Helmholtz resonator amplifies the pressure ratio from 1.22 to 1.49 and produces a pressure amplitude of 0.44 MPa.

Details

  • Original title: Methods to focus acoustic energy of a thermoacoustic engine.
  • Record ID : 2008-1918
  • Languages: English
  • Source: Cryogenics and refrigeration. Proceedings of ICCR'2008.
  • Publication date: 2008/04/05

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