摘要
从声通量的观念阐明Higgins-Rijke管的热声现象机理。由于热源处的温度梯度、管内驻波场的质点振速和脉动压力之间的相位差偏离90°,因此有声通量。流出和流入热源区的声通量之差为正值时,该热源区是声源;若声通量之差为负值,则是声壑。用本模型不仅合理地解释了热源位置在管中的重要性,也较好地解释了 Higgins-Rijke管中的其他各种现象。
A new mechanism of Higgins-Rijke heat-driven sound is expounded based upon sound energy flux in present paper. Due to temperature gradient of heat source, the phase angle between pressure and particle velocity in standing wave field within Higgins-Rijke tube deviates from 90° and therefore there is sound energy flux in the tube. If the difference of sound intensity between outing from and entering into heat source is positive, this heat source is a sound source; and contrarily the heat source is a sound absorber. The present mechanism can explain not only the importance of heat source location but also almost all phenomena in Higgins-Rijke tubes.
出处
《声学学报》
EI
CSCD
北大核心
2002年第5期420-424,共5页
Acta Acustica
基金
国家自然科学基金资助项目
