Acoustic agglomeration technology use high-intensity acoustic field to make aerosol particles collide and condense rapidly. Existing studies have shown that 70%–90% of fine particles can be eliminated within minutes using compression drives and air-jet generators. Currently, there are limitations to the sound sources used. In this paper, an airborne ultrasonic transducer with a resonant frequency of 15 kHz is designed, followed by the corresponding numerical simulation and experiments for the evaluation of the vibration modal and sound pressure field. The sound pressure levels (SPL) of the open space and the agglomeration chamber can reach 150 dB and 156 dB, respectively. The agglomeration effect of water droplets, liquid phase smoke, solid phase smoke and mixed smoke is experimentally investigated, and the light transmittance rapidly increases from 8% to 60% within 4 s, 8 s, 5 s and 6 s, respectively. Agglomeration is also effective in the high-frequency range, and we infer that the acoustic wake effect is the predominant mechanism. The elimination effect is promoted with the increasing of SPL until the corresponding secondary acoustic effect is enhanced. Moreover, the agglomeration rate of higher concentration aerosol is significantly better than that of diluted aerosols in ultrasonic agglomeration process.

声学凝聚技术利用高强度声场使气溶胶粒子快速碰撞凝聚。现有研究表明，使用压缩驱动和喷气式发电机可以在几分钟内消除 70%–90% 的细颗粒。目前，对使用的声源有限制。本文设计了一种谐振频率为 15 kHz 的机载超声换能器，随后进行了相应的数值模拟和实验，以评估振动模态和声压场。开放空间和团聚室的声压级 (SPL) 可分别达到 150 分贝和 156 分贝。实验研究了水滴、液相烟气、固相烟气和混合烟气的团聚效应，透光率分别在 4 s、8 s、5 s 和 6 s 内从 8% 迅速增加到 60%。聚集在高频范围内也有效，我们推断声学尾流效应是主要机制。随着声压级的增加，消声效果不断增强，直至相应的二次声学效应增强。此外，在超声波团聚过程中，较高浓度气溶胶的团聚率明显优于稀释气溶胶。