Rijke型热声自激振荡机理研究进展

Rijke管热致声现象自发现以来得到了广泛的研究和应用,并发展成为高效率的行波型热声热机,但其热声自激振荡机理一直没有被完全揭示清楚。热声激振条件关系到对低品位能源的利用和热声转换效率的提高,因此对自激振荡机理的研究成为热声技术的首要课题。经典线性热声理论作为对小振幅弱非线性现象的一种近似,可以粗略指导热声热机的设计,但不能解决诸如起振、声流和声压饱和等非线性问题。通过对近几十年来Rijke型热声自激振荡机理研究进展的总结,指出最近发展的几种非线性热声理论存在的局限性,并提出了未来在自激振荡机理研究方面的研究方法和研究方向。

Advances in research of mechanism of Rijke-type thermoacoustic self-excited oscillations

Since the thermoacoustic effect in Rijke tube was found, it was widely used and studied, and had been developed into the high efficiency travelling wave thermoacoustic engine. However, the mechanism of the thermoacoustic self-excited oscillations had not been understood expressly. The onset threshold of thermoacoustic engines determined the using of the low grade energy and the rising in the thermal efficiency. So it was essential to understand the serf-excited oscillation mechanism. The classic linear thermoacoustic theory, as a simplification of the weak nonlinear phenomenon, could design the thermoacoustic engine roughly, but it couldn' t solve the nonlinear problems, such as the onset process, the acoustic streaming and the acoustic nonlinear saturation. The recent development of the mechanism of the Rijke-type thermoacoustic self-excited oscillations was introduced and estimated. And the limitations of different nonlinear thermoacoustic theories were indicated. Finally, some novel research methods and directions in the future were advised.