结构化的复合声场及其操纵颗粒有效性的实验研究

发布时间：2019-03-25 20:31

【摘要】：基于装置各部件固有频率相等的方法,设计制作了一种在平面声腔侧壁离散对称布置16极Helmholtz声源的实验装置,研究了平面声腔内由16极Helmholtz声源构造的复合声场及其对颗粒的操纵特性.通过理论和实验研究了Helmholtz声源的频率特性、平面声腔的谐振特性、平面声腔内复合声场的时空变化特性以及复合声场对平面声腔内充注的烟气颗粒操纵的有效性.结果表明:运行频率为1.805 k Hz时,16极Helmholtz声源耦合的平面声腔能够实现同步谐振;平面声腔内形成了声压幅度逐渐衰减的环形复合声场;烟气颗粒被聚集在靠近壁面约0.5个波长的环形区域内,在平面声腔的中部形成了无颗粒区,颗粒聚集区与无颗粒区的面积比约为16∶9.
[Abstract]:Based on the method of equal natural frequency of each part of the device, an experimental device is designed and fabricated, in which a 16-pole Helmholtz sound source is dispersed and symmetrically arranged on the side wall of the plane acoustic cavity. The composite acoustic field constructed by a 16-pole Helmholtz sound source in a plane acoustic cavity and its maneuvering characteristics on particles are studied. The frequency characteristics of the Helmholtz sound source, the resonance characteristics of the plane sound cavity, the spatio-temporal variation of the composite sound field in the plane sound cavity and the effectiveness of the composite sound field on the control of the smoke particles filled in the plane sound cavity are studied theoretically and experimentally. The results show that when the operating frequency is 1.805 k Hz, a planar cavity coupled with a 16-pole Helmholtz sound source can achieve synchronous resonance, and a ring compound sound field with gradual attenuation of sound pressure amplitude is formed in the plane cavity. The smoke particles are concentrated in an annular region with about 0.5 wavelengths near the wall, and a particle-free zone is formed in the middle of the plane acoustic cavity. The area ratio of the particle aggregation area to the non-particle area is about 16 ~ 9.
【作者单位】：东南大学能源与环境学院;东南大学能源热转换及其过程测控教育部重点实验室;
【基金】：中央高校基本科研业务费专项资金资助项目(3203005101) 江苏省普通高校研究生科研创新计划资助项目(KYLX15_0069)
【分类号】：TB5

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