A thermoacoustic-Stirling heat engine: Detailed study
A thermoacoustic-Stirling heat engine: Detailed study
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DOI：
10.1121/1.429343
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发表时间：
2000-06-01
影响因子：
2.4
通讯作者：
Swift, GW
中科院分区：
文献类型：
--
作者：
Backhaus, S;Swift, GW
介绍了一种基于行波和理想可逆传热的新型热声发动机。对其性能进行了测试和分析。这种新发动机比以前的热声发动机（基于驻波和本质上不可逆的传热）性能好50%以上。在其最有效的工作点，它以0.30的热效率向其谐振器提供710 W的声功率，相当于卡诺效率的41%。在其最强大的工作点，它提供890 W的热效率为0.22的谐振器。这种发动机的效率会被两种类型的声流所降低。通过适当减小发动机关键表面的锥度以及使用额外的非线性来诱导相反的时间平均压差，可以抑制这些影响。给出的数据表明，流对流热负荷几乎完全消除。对这些和其他不可逆性的分析表明，发动机的哪些部件需要进一步研究以达到更高的效率。此外，这些数据表明，动力学和声功率流被很好地理解，但流抑制和相关热对流的细节只是定性的理解。(C) 2000美国声学学会。[s0001 - 4966 (00) 00206 - x)。
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. [S0001-4966(00)00206-X].