Investigation of edge effects in thermoacoustic couple measurements
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Authors
Liu, Wei-Hsin
Subjects
Acoustics
Thermoacoustics
Thermoacoustic Heat Transport
Thermoacoustics
Thermoacoustic Heat Transport
Advisors
Atchley, Anthony A.
Hofler, Thomas J.
Date of Issue
1990-12
Date
December 1990
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics Academic Committee
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
x, 36 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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.