声悬浮高温小球轴向稳定性研究  

Study of the axial stability of a sphere with high temperature in acoustic levitation

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作  者:王晓振 常钦 吴鹏飞[1,2] 徐德龙 王祥达[1,4] 张丽 林伟军 WANG Xiaozhen;CHANG Qin;WU Pengfei;XU Delong;WANG Xiangda;ZHANG Li;LIN Weijun(Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049;China Nuclear Power Engineering Co.,Ltd,Beijing 100840;Ruyuan Yao Autonomous Dongyangguang Industrial Development Co.,Ltd,Shaoguan 512721)

机构地区:[1]中国科学院声学研究所,北京100190 [2]中国科学院大学,北京100049 [3]中国核电工程有限公司,北京100840 [4]乳源瑶族自治县东阳光实业发展有限公司,韶关512721

出  处:《声学学报》2024年第1期129-136,共8页Acta Acustica

基  金:国家自然科学基金项目(11904384,11474305);中国科协青年人才托举工程项目(2022-2024QNRC001);中国科学院基础前沿研究计划项目(ZDBS-LY-SLH037)资助。

摘  要:针对驻波声悬浮高温小球的轴向稳定性,建立了声−热−流−重力场耦合的物理模型,采用有限元方法计算了高温小球周围空间的不均匀温度场和声场,分析了驻波声场中直径2 mm的氮化硅小球在300~2000 K温度区间的轴向悬浮稳定性,并通过常温下声悬浮实验验证了仿真模型的准确性。结果表明在初始悬浮间距满足谐振并保持不变的条件下,随着悬浮小球的温度升高,小球的平衡位置降低,并且存在能保持稳定悬浮状态的温度最大值。在小球升温的过程中,通过反馈调节发射端−反射端间距和发射端激励电压,可以在一定程度上保持高温小球的轴向悬浮稳定性。Aiming at the axial stability of a high-temperature sphere levitated in a standing wave field,the physical model coupled with the sound field,heat field,flow field and gravity field is established.Based on the finite element method,the non-uniform temperature field and sound field in the space around the sphere are calculated.The axial levitation stability of a silicon nitride sphere with a diameter of 2 mm in the standing wave acoustic field are analyzed when the temperature increases from 300 K to 2000 K.The accuracy of the simulation model is verified by the experiments of acoustic levitation at normal atmospheric temperature.The results show that under the condition that the initial levitation spacing satisfies resonance and remains constant,the equilibrium position of the sphere decreases with increasing temperature of the sphere,and there exists a maximum temperature for stable levitation of the sphere.With increasing temperature,the axial stability of the levitated sphere can be maintained to a certain extent by adjusting the emitter-reflector distance and emitter excitation voltage through feedback.

关 键 词:声悬浮 高温小球 非均匀温度场 轴向稳定性 

分 类 号:TB5[理学—物理]

 

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