Numerical studies on mode transition and performance of the thermoacoustic engine coupled with acoustic pressure amplifier tube and load

Yafeng Niu, Haomai Zhang, Hantao Jiang, Lulu Hu and Yingwen Liu

Energy, 2024, vol. 307, issue C

Abstract: Acoustic pressure amplifier tubes (APAT) have shown excellent performance in thermoacoustic engine (TAE) systems when coupled with loads. Nonetheless, the oscillatory mode transition caused by the introduction of APAT and loads can significantly influence system performance. In order to investigate the effect of APAT dimensions and load impedances on the mode transition and system performance, the TAE system coupled with APAT and load was numerically solved by CFD software. Combined with the nonlinear dynamic methods, three oscillatory states are found in the coupled system: low frequency limit cycle oscillation, quasi-periodic oscillation, and high frequency limit cycle oscillation. The parameter selection scheme favoring the excitation of high frequency modes is also given. There are the optimal APAT length, diameter, position and acoustic resistance, to allow the load to obtain the maximum acoustic power. Comparing the system performance under different oscillatory modes, it is found that the existence of high frequency modes is helpful to take full advantage of the APAT's acoustic pressure amplification effect. Furthermore, the correspondence between the oscillatory modes, the pressure distributions and the stream directions are identified. Based on this, the principle of APAT's acoustic pressure amplification under different modes is explained, and the change tendency of high frequency and low frequency with APAT length and position is predicted reasonably. We believe that this work will provide a reference for the design and optimisation of the couple between TAE and load.

Keywords: Thermoacoustic; Mode transition; System performance; Acoustic pressure amplifier tubes; Load (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544224025209
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:307:y:2024:i:c:s0360544224025209

DOI: 10.1016/j.energy.2024.132746

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().