Investigation of a heat driven thermoacoustic prime mover.
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Authors
Lin, Hsiao-Tseng
Subjects
acoustics
thermoacoustic heat transport
thermoacoustic heat transport
Advisors
Atchley, Anthony A.
Hofler, Thomas J.
Date of Issue
1989-12
Date
December 1989
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The goal of this thesis is to investigate the work output of a heat driven
thermoacoustic prime mover. The experimental approach was to measure the
frequency response of both a simple resonant tube and a prime mover for a
variety of values of mean gas pressure and applied temperature difference across
the prime mover stack. A least squares fit to the frequency response yields the
quality factor which can be compared to predictions based on a short stack,
boundary layer approximation theory by Swift [J. Acoust. Soc. Am. 84, 1145-
1180 (1988)]. The results are reported of measurements made on the lowest
three modes of the prime mover in helium for mean gas pressures between
approximately 170 kPa and 500 kPa and the applied temperature differences
between zero and onset. The signal waveforms of the sound generated by the
prime mover above onset at a mean gas pressure of 308 kPa are also reported.
Results for the resonant tube have at most 3% difference with theory. For the
prime mover, the measurements generally agree with predictions for the
fundamental mode except close to onset. This agreement between measured and
predicted results worsens with decreasing mean gas pressure. Agreement is poor
for the second and third modes for all pressures used. Finally, the sound
generated by the prime mover above onset is highly distorted, and the distortion
becomes more serve as the temperature difference increases. The peak positive
pressure amplitude of this signal at temperature difference of 325°C, 368°C and
453°C are 1.1%, 4.4% and 7.9% of mean gas pressure, respectively.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
66 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner