自相似声压驱动下气泡的振动  

Bubble oscillations driven by self-similar sound

作　　者：王文杰[1] 陈伟中[1] 姜李安[1] 魏荣爵[1] 

机构地区：[1]南京大学声学研究所近代声学国家重点实验室,南京210093

出　　处：《声学学报》2005年第1期31-36,共6页Acta Acustica

基　　金：国家自然科学基金项目(10174036)教育部跨世纪优秀人才培养计划资助课题

摘　　要：单泡声致发光来自于气泡经过缓慢膨胀之后的急剧塌缩的过程,而这种急剧塌缩是高阶谐波振动的结果。基于线性叠加的思想,提出了自相似驱动的概念,即用与半径振动相似的声压来驱动气泡。数值模拟表明,自相似驱动声压能够有效地加剧气泡的塌缩过程。与正弦驱动比较,包含基波和二次谐波的自相似驱动显著地提高光辐射强度。这为多频最优化驱动提升发光强度提供了一个直观的物理图景,也给出了一种可用于实验的提升声致发光的方法。Single-bubble sonoluminescence occurs at the rapid collapse of the bubble after a long and slow expansion, and the bubble oscillation in the higher harmonic modes leads to the rapid collapse. Based on the idea of linear superposition, the concept of self-similar driving, driving the bubble by the sound pressure similar to its oscillation, has been put forward. The numerical simulation indicates that the rapid collapse of the bubble can be enhanced under the drive of the self-similar sound. Compared to sinusoidal driving, the self-similar sound consisting of the fundamental and its second harmonic, results in a remarkable increase of light emission. The investigation gives an intuitionistic picture for the optimized multi-frequency driving and proposes an experimental method to upscale the sonoluminescence.

关 键 词：塌缩 单泡声致发光 线性叠加 声压 气泡 高阶 自相似 驱动 多频 发光强度 

分 类 号：O32[理学—一般力学与力学基础]