Investigation of a heat driven thermoacoustic prime mover above onset of self-oscillation
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Authors
Bowers, Earl Clayton
Subjects
Acoustics
Thermoacoustsics
Prime mover
Thermoacoustic heat transfer
Thermoacoustsics
Prime mover
Thermoacoustic heat transfer
Advisors
Atchley, Anthony A.
Gaitan, Felipe
Date of Issue
1991-09
Date
September 1991
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The goal of this thesis is to investigate the work output of a heat riven thermoacoustic prime mover above onset of self-oscillation. The exponentially growing sound wave, generated when a prime mover is initially "turned on," was digitally sampled for a helium filled prime mover at pressures ranging from 238 kPa to 500 kPa and at temperatures differences ranging from onset to 400 K. This data was then digitally filtered by a 100 Hz band pass filter centered on the prime mover's fundamental frequency. A least mean squares fit was applied to the envelope of the filter's output in order to determine the temporal absorption coefficient (B). From (B) the quality factor was computed. These quality factors were then compared with thermoacoustic theory. The agreement between the theoretical predictions and the measured results is extremely good at high mean gas pressures. As the mean gas pressure decreases, however, the agreement between the theoretical value of onset and the predicted slope of the data, increasingly deviate.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics Academic Committee
Antisubmarine Warfare Academic Group
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funding
Format
56 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.