CFD study on mean flow engine for wind power exploitation
CFD study on mean flow engine for wind power exploitation
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DOI：
10.1016/j.enconman.2010.12.046
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发表时间：
2011-06
影响因子：
10.4
通讯作者：
Y. Yu;Da-ming Sun;Ke Wu;Ya Xu;Haijun Chen;Xue-jun Zhang;L. Qiu
中科院分区：
文献类型：
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作者：
Y. Yu;Da-ming Sun;Ke Wu;Ya Xu;Haijun Chen;Xue-jun Zhang;L. Qiu
当主管道中的平均气流通过分支管的开口时，可以在封闭的分支管中诱发声振荡。基于这一原理，可以制造出新型的气动发电机和热声制冷机。采用湍流大涡模拟（LES）方法，对交叉连接平均流发动机（MFE）内气动驱动的声振荡进行了数值模拟。结果表明，在一定的平均流速下，封闭分支管内形成驻波声场。不同的声学和流体动力学模式出现的平均流速的增加。此外，斯特劳哈尔数有很大的影响，声学和流体动力模式的MFE。在目前的计算条件下，在第一和第五声学模式的临界声压幅值分别发生时，St=0.39和St=0.94。设计在第三声学模式下操作的MFE以获得强声学振荡将是有益的。
Acoustic oscillation can be induced in a closed branch tube by a mean gas flow in a trunk tube passing the opening of the branch tube. Based on this principle, novel aerodynamically driven generator and thermoacoustic refrigerator can be manufactured. Large-eddy simulation (LES) of turbulence was applied to simulate aerodynamically driven acoustic oscillation in a mean flow engine (MFE) with a cross-junction configuration. It is shown that a standing-wave acoustic field is established inside the closed branch tube at certain mean flow velocities. Different acoustic and hydrodynamic modes occur with the increase of mean flow velocity. Furthermore, Strouhal number has strong effects on acoustic and hydrodynamic modes of the MFE. Under present computational conditions, critical acoustic pressure amplitudes in the first and fifth acoustic modes occur when St=0.39 and St=0.94 respectively. It would be beneficial to design MFEs operating in the third acoustic mode to obtain strong acoustic oscillation.