激光空泡诱导自由面水花动力学特性研究  

Study on dynamics characteristics of splash sheet generated by laser-induced cavitation bubble

作　　者：王广航 王傲 王静竹 王一伟 WANG Guang-hang;WANG Ao;WANG Jing-zhu;WANG Yi-wei(School of Future Technology,University of Chinese Academy of Sciences,Beijing 100049,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Mechanics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大学未来技术学院,北京100049 [2]中国科学院大学工程科学学院,北京100049 [3]中国科学院力学研究所,北京100190

出　　处：《水动力学研究与进展（A辑）》2021年第6期788-792,共5页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(11802311、12122214);中国科学院青年创新促进会优秀会员(Y201906)。

摘　　要：空泡与自由面相互作用涉及自由面的强非线性变化和空泡非定常演化,是前沿的基础科学问题。该文通过实验观测和理论建模相结合的方式,分析了激光空泡诱导自由面水花动力学特征。在实验中,利用脉冲激光在水中聚焦的光学击穿原理生成空泡,建立了基于物距补偿原理的两相联合观测的实验方法,可以同时清晰获得自由面水花和水下空泡的成像。在理论建模方面,借鉴光滑粒子建模(SPH)思想,建立了自由面水花演化动力学模型,能够分析空泡通气膨胀过程中自由面水花的演化过程,与实验观测结果吻合较好。The interaction between a cavitation bubble and the free surface,involving the nonlinear deformation of the free surface and the unsteady evolution of a cavitation bubble,is a frontier scientific issue in the field of the fluid mechanics and bubble dynamics.In this paper,experimental observation and theoretical analysis are combined to investigate the dynamic characteristics of the splash sheet induced by an expanding cavitation bubble.In the experiment,the cavitation bubble is generated by focusing the pulsed laser in water due to the optical breakdown principle.An experimental setup based on the object distance compensation method is designed to obtain images of the splash sheet and the cavitation bubble clear simultaneously.To analyze the evolution of the splash sheet with the expansion of the cavitation bubble,a dynamic model is developed referring to the idea of Smooth Particle Hydrodynamics model(SPH).The results o btained by the analytical model show good agreements with experimental observation.

关 键 词：激光空泡 水花动力学 水花闭合 

分 类 号：O359.1[理学—流体力学]