Investigation of edge effects in thermoacoustic couple measurements

Previous measurements of thermoacoustic heat transport across stacks of short plates, called thermoacoustic couples or TACs, revealed serious discrepancies between theory and experiment. The discrepancies are worst at higher drive ratios (the ratio of the peak acoustic pressure amplitude at a pressure antinode to the mean pressure of the gas), where prominent irregularities in the data series appear. In the previous work, the measurements were made with thermopiles having junctions that were located along the leading and trailing edges of the TAC plates. Because of its proximity to the edge, the thermopile may have been sensitive to effects which, though perhaps causing local deviations in the temperature profile, do not affect the temperature profile in interior regions of the plate. To investigate whether edge effects are the cause of any of these discrepancies, we have constructed a TAC with two thermopile, whose conjunction do not lie along the edge, and repeated some of the previous measurements. Measurements were also made with a stack of long plates to probe how far the irregularities extend in to the interior of the plate. It was found that the irregularities are not isolated to the edge of the TAC. The temperature profile of interior portions of the plates mimic that measured along the edge.

Department dc:contributor.department

Engineering Acoustics Academic Committee

Grantor dc:publisher

Monterey, CA; Naval Postgraduate School

Year dc:date.issued

1990

Author dc:creator

• Liu, Wei-Hsin

Advisors dc:contributor.advisor

• Atchley, Anthony A.
• Hofler, Thomas J.

Statement dc:rights

• This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.

Handle dc:identifier.uri

https://hdl.handle.net/10945/27624

OAI identifier oai:identifier

oai:calhoun.nps.edu:10945/27624