Evolution of the temperature profile in a simple thermoacoustic stack
By: Arthur R. Salindong and David D. Hebert
Contributors: Hebert, David D.
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1996
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 124
Description: The purpose of this thesis is to provide data on the evolution of the temperature profile in a      simple thermoacoustic stack. These measurements are made to support the development of      nonlinear time-dependent models of thermoacoustics. An acoustic resonator and driver is      used with a five plate stainless steel stack. The center plate of the stack is instrumented with      nine thermocouples, one in the midpoint and four near each end of the plate. The edge      thermocouples are located within an acoustic displacement amplitude of one another at high      amplitude drive conditions. Temperature evolution data is recorded for both argon and      helium gases at several mean pressures and several drive ratios with the stack located      between a pressure node and antinode. This data showed a deviation from linear theory at      drive ratios above 1.5%. A crossover of gradient magnitudes is evident during gradient      formation with edge thermocouple pairs initially forming larger gradients but dropping in      magnitude to less than those of the inner thermocouple pairs after 25-50 seconds. As the      gradients approached steady state conditions, they split into two groups of gradient pairs      that appeared independent of displacement amplitude. Measurements are also made with      the stack positioned in the vicinity of a pressure node and a pressure antinode. This data      will be used for future study.
Notes: Thesis advisor(s): A.A. Atchley, Thomas J. Hofler, Robert Keolian.

"December 1996."

Thesis (M.S. in Physics and M.S. in Engineering Acoustics) Naval Postgraduate School, December 1996.

Co-author's thesis (M.S. in Applied Physics) Naval Postgraduate School, December 1996.

Includes bibliographical references (p. 121)

Approved for public release; distribution unlimited.

Also available online.

Mode of access: World Wide Web.

System requirements: Adobe Acrobat Reader.

US Navy (USN) authors.

dk/dk cc:9116 5/15/97