Andersen Bonnie J, Symko Orest G
Department of Physics, University of Utah, Salt Lake City, Utah 84112-0830, USA.
J Acoust Soc Am. 2009 Feb;125(2):787-92. doi: 10.1121/1.3050263.
In a thermoacoustic prime mover, high acoustic output power can be achieved with a large-diameter stack and with a cavity with a large volume attached at the open end of the resonator containing the stack. The combination of resonator and cavity makes the device Helmholtz-like, with special characteristics of the resonant frequencies and quality factor, Q. Analysis of its acoustic behavior based on a model of a closed bottle presents features that are useful for the development of such prime movers for energy conversion from heat to sound. In particular, the arrangement produces in the cavity a high sound level, which is determined by the Q of the system. Comparison with a half-wave resonator type of prime mover, closed at both ends, shows the advantages of the Helmholtz-like device.
在热声原动机中，通过使用大直径的叠层以及在包含叠层的谐振器开口端连接一个大容积的腔体，可以实现高声功率输出。谐振器和腔体的组合使该装置类似亥姆霍兹共振器，具有特定的共振频率和品质因数Q。基于封闭瓶子模型对其声学行为进行分析，呈现出的特性有助于开发这种用于将热能转换为声能的原动机。特别地，这种布置在腔体中产生高声强，其由系统的品质因数Q决定。与两端封闭的半波谐振器型原动机相比，展示了类似亥姆霍兹共振器装置的优势。
