Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model

Onset characteristics of thermoacoustic engines are of great importance for understanding the internal working mechanisms of thermoacoustic conversion. A one-dimensional time-domain network model for predicting the onset characteristics of traveling-wave thermoacoustic engines with helium as working...

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Main Authors: Wang, Kai, Zhang, Jie, Zou, Jiang, Wu, Ke, Qiu, Li Min, Huang, Z. Y., Sun, Da Ming
Other Authors: Energy Research Institute @ NTU (ERI@N)
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/103665
http://hdl.handle.net/10220/25842
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1036652021-01-13T05:02:04Z Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model Wang, Kai Zhang, Jie Zou, Jiang Wu, Ke Qiu, Li Min Huang, Z. Y. Sun, Da Ming Energy Research Institute @ NTU (ERI@N) DRNTU::Science::Physics::Heat and thermodynamics Onset characteristics of thermoacoustic engines are of great importance for understanding the internal working mechanisms of thermoacoustic conversion. A one-dimensional time-domain network model for predicting the onset characteristics of traveling-wave thermoacoustic engines with helium as working gas is built. The acoustic resistance, inertance, compliance, and thermal-relaxation effects of all the acoustic components are included. The viscous and heat transfer terms in the time-domain governing equations of the acoustic tubes and the heat exchangers are deduced from the frequency-domain linear thermoacoustic theory. Combining the time-domain governing equations of the regenerator, numerical simulations of the whole onset process are then conducted in a wide operating condition range. The complete dynamic pressure wave evolution processes are simulated successfully. It is shown that a steady standing-wave acoustic field forms in almost all parts of the traveling-wave thermoacoustic engine except for the regenerator area. Onset temperature, operating frequency, and quality factor are calculated with a relatively high accuracy. The thermal relaxation effects in the regenerator are found to have a remarkable impact on the onset characteristics, especially at high mean pressures. It is also shown that the experimental damping temperature is closer to the calculated onset temperature than the experimental onset temperature. Furthermore, the reasonable distributions of the pressure and volume flow rate and the phase relationship between them in the whole system are obtained and analyzed. Accepted version 2015-06-09T00:41:08Z 2019-12-06T21:17:23Z 2015-06-09T00:41:08Z 2019-12-06T21:17:23Z 2015 2015 Journal Article Wang K., Sun, D. M., Zhang, J., Zou, J., Wu, K., Qiu, L. M., et al. (2015). Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model. International journal of thermal sciences, 94, 61-71. https://hdl.handle.net/10356/103665 http://hdl.handle.net/10220/25842 10.1016/j.ijthermalsci.2015.02.010 185745 en International journal of thermal sciences © 2015 Elsevier Masson SAS. This is the author created version of a work that has been peer reviewed and accepted for publication by International Journal of Thermal Sciences, Elsevier Masson SAS. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.ijthermalsci.2015.02.010]. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Physics::Heat and thermodynamics
spellingShingle DRNTU::Science::Physics::Heat and thermodynamics
Wang, Kai
Zhang, Jie
Zou, Jiang
Wu, Ke
Qiu, Li Min
Huang, Z. Y.
Sun, Da Ming
Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model
description Onset characteristics of thermoacoustic engines are of great importance for understanding the internal working mechanisms of thermoacoustic conversion. A one-dimensional time-domain network model for predicting the onset characteristics of traveling-wave thermoacoustic engines with helium as working gas is built. The acoustic resistance, inertance, compliance, and thermal-relaxation effects of all the acoustic components are included. The viscous and heat transfer terms in the time-domain governing equations of the acoustic tubes and the heat exchangers are deduced from the frequency-domain linear thermoacoustic theory. Combining the time-domain governing equations of the regenerator, numerical simulations of the whole onset process are then conducted in a wide operating condition range. The complete dynamic pressure wave evolution processes are simulated successfully. It is shown that a steady standing-wave acoustic field forms in almost all parts of the traveling-wave thermoacoustic engine except for the regenerator area. Onset temperature, operating frequency, and quality factor are calculated with a relatively high accuracy. The thermal relaxation effects in the regenerator are found to have a remarkable impact on the onset characteristics, especially at high mean pressures. It is also shown that the experimental damping temperature is closer to the calculated onset temperature than the experimental onset temperature. Furthermore, the reasonable distributions of the pressure and volume flow rate and the phase relationship between them in the whole system are obtained and analyzed.
author2 Energy Research Institute @ NTU (ERI@N)
author_facet Energy Research Institute @ NTU (ERI@N)
Wang, Kai
Zhang, Jie
Zou, Jiang
Wu, Ke
Qiu, Li Min
Huang, Z. Y.
Sun, Da Ming
format Article
author Wang, Kai
Zhang, Jie
Zou, Jiang
Wu, Ke
Qiu, Li Min
Huang, Z. Y.
Sun, Da Ming
author_sort Wang, Kai
title Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model
title_short Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model
title_full Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model
title_fullStr Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model
title_full_unstemmed Numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model
title_sort numerical simulation on onset characteristics of traveling-wave thermoacoustic engines based on a time-domain network model
publishDate 2015
url https://hdl.handle.net/10356/103665
http://hdl.handle.net/10220/25842
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