Specific acoustic impedance measurements of an air-filled thermoacoustic prime mover

Journal Article · Tue Dec 01 00:00:00 EST 1992 · Journal of the Acoustical Society of America; (United States)

DOI:https://doi.org/10.1121/1.404167· OSTI ID:6629167

Arnott, W P; Bass, H E; Raspet, R ^[1]

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1. Univ. of Mississippi, University (United States)

Thermoacoustic heat engines can be used to produce sound from heat and to transport heat using sound. The air-filled prime mover studied is a quarter wavelength resonator that produces sound at nominally 115 Hz for a temperature difference of [Delta]T = 176 K. Specific acoustic impedance at the mouth of the prime mover was measured as a function of the temperature difference between the hot and cold heat exchangers. The real part of the impedance changes sign for sufficiently large temperature differences, indicating the possibility of sound production. The theoretically predicted radiation impedance of an open pipe was compared to the measured impedance curves. The operating point was confirmed from the intersection of these experimental and theoretical impedance curves. These measurements allow for analysis of the prime mover as a sound source as discussed in a recent theoretical paper [T. B. Gabrielson, J. Acoust. Soc. Am. 90, 2628-2636 (1991)]. 11 refs., 2 figs.

• OSTI ID: 6629167
• Journal Information: Journal of the Acoustical Society of America; (United States), Vol. 92:6; ISSN 0001-4966
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
HEAT ENGINES
IMPEDANCE
HEAT EXCHANGERS
ACOUSTICS
BENCH-SCALE EXPERIMENTS
EXPERIMENTAL DATA
TEMPERATURE DISTRIBUTION
THEORETICAL DATA
WAVE PROPAGATION
DATA
ENGINES
INFORMATION
NUMERICAL DATA
300800* - Direct Energy Conversion- Miscellaneous Converters
661300 - Other Aspects of Physical Science- (1992-)