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Title: A thermoacoustic-Stirling heat engine: Detailed study

Abstract

A new type of thermoacoustic engine based on traveling waves and ideally reversible heat transfer is described. Measurements and analysis of its performance are presented. This new engine outperforms previous thermoacoustic engines, which are based on standing waves and intrinsically irreversible heat transfer, by more than 50%. At its most efficient operating point, it delivers 710 W of acoustic power to its resonator with a thermal efficiency of 0.30, corresponding to 41% of the Carnot efficiency. At its most powerful operating point, it delivers 890 W to its resonator with a thermal efficiency of 0.22. The efficiency of this engine can be degraded by two types of acoustic streaming. These are suppressed by appropriate tapering of crucial surfaces in the engine and by using additional nonlinearity to induce an opposing time-averaged pressure difference. Data are presented which show the nearly complete elimination of the streaming convective heat loads. Analysis of these and other irreversibilities show which components of the engine require further research to achieve higher efficiency. Additionally, these data show that the dynamics and acoustic power flows are well understood, but the details of the streaming suppression and associated heat convection are only qualitatively understood. (c) 2000 Acoustical Societymore » of America.« less

Authors:
 [1];  [1]
  1. Condensed Matter and Thermal Physics Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216523
Resource Type:
Journal Article
Journal Name:
Journal of the Acoustical Society of America
Additional Journal Information:
Journal Volume: 107; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0001-4966
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; STIRLING ENGINES; TRAVELLING WAVES; HEAT TRANSFER; CONVECTION; HEAT ENGINES; ACOUSTICS; EFFICIENCY; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Backhaus, S., and Swift, G. W. A thermoacoustic-Stirling heat engine: Detailed study. United States: N. p., 2000. Web. doi:10.1121/1.429343.
Backhaus, S., & Swift, G. W. A thermoacoustic-Stirling heat engine: Detailed study. United States. doi:10.1121/1.429343.
Backhaus, S., and Swift, G. W. Thu . "A thermoacoustic-Stirling heat engine: Detailed study". United States. doi:10.1121/1.429343.
@article{osti_20216523,
title = {A thermoacoustic-Stirling heat engine: Detailed study},
author = {Backhaus, S. and Swift, G. W.},
abstractNote = {A new type of thermoacoustic engine based on traveling waves and ideally reversible heat transfer is described. Measurements and analysis of its performance are presented. This new engine outperforms previous thermoacoustic engines, which are based on standing waves and intrinsically irreversible heat transfer, by more than 50%. At its most efficient operating point, it delivers 710 W of acoustic power to its resonator with a thermal efficiency of 0.30, corresponding to 41% of the Carnot efficiency. At its most powerful operating point, it delivers 890 W to its resonator with a thermal efficiency of 0.22. The efficiency of this engine can be degraded by two types of acoustic streaming. These are suppressed by appropriate tapering of crucial surfaces in the engine and by using additional nonlinearity to induce an opposing time-averaged pressure difference. Data are presented which show the nearly complete elimination of the streaming convective heat loads. Analysis of these and other irreversibilities show which components of the engine require further research to achieve higher efficiency. Additionally, these data show that the dynamics and acoustic power flows are well understood, but the details of the streaming suppression and associated heat convection are only qualitatively understood. (c) 2000 Acoustical Society of America.},
doi = {10.1121/1.429343},
journal = {Journal of the Acoustical Society of America},
issn = {0001-4966},
number = 6,
volume = 107,
place = {United States},
year = {2000},
month = {6}
}