Study on noise and atomization dust suppression performance of a low-noise supersonic atomization device

doi:10.16265/j.cnki.issn1003-3033.2026.08.1307

Abstract

Abstract:

To reduce the high-frequency noise generated by supersonic atomization dust suppression technology, a low-noise supersonic atomization dust suppression technology equipped with foam metal nozzles was developed. Multi-physical field simulations were conducted on the sound field of nozzles. Combined with experiments, this study explored the influences of foam metal material parameters and aerodynamic pressure on spray noise, droplet particle size and dust removal efficiency, analyzed the noise reduction mechanism of porous foam metals in the noise generation process of transonic flow, and selected preferable materials for noise-reducing nozzles. The results show that among various materials, porous aluminum foam delivers superior noise reduction performance, cutting noise by approximately 16.3% in the sound radiation direction to below 60 dB, which is far below national standards. For the same material, the sound pressure level in medium and high frequency bands at sound sources and sound radiation positions rises with the increase of average equivalent pore diameter. Rising pressure also leads to increased sound pressure levels across all frequency bands of different nozzles. Under identical working conditions, the droplet particle size of all nozzles is around 11 μm at the 50% quantity distribution, and the total dust removal efficiency exceeds 84% within 3 minutes of dust suppression. The intricate pore structure inside foam metal Laval nozzles effectively absorbs vibration conduction energy generated during pneumatic atomization, markedly lowering the sound pressure level of sound sources propagating radially through nozzle side walls.

Key words: supersonic atomization, porous foam metal, high-frequency noise, noise reduction performance, dust suppression characteristics

CLC Number:

Tao Shuang, Zhang Tian, Tong Linquan, Ge Shaocheng, Li Sheng, Wang Changyou. Study on noise and atomization dust suppression performance of a low-noise supersonic atomization device[J]. China Safety Science Journal, 2026, 36(8): 160-168.

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边界参数	数值	边界参数	数值	边界参数	数值
入口速度V₁/(m/s)	1.7	比气体常数R_s/(J/(kg/K))	287	比热率γ	1.4
温度T/K	300	方位角模数m	0	流体密度ρ₀/(kg/m³)	3.48
多孔材料密度ρ_c/(kg/m³)	1 000、4 047	声速c₀/(m/s)	347	孔隙率ϕ	0.5、0.8
杨氏模量E/Pa	1.5×10¹¹、2×10¹¹	普朗特数P_r	0.72	泊松比n	0.3、0.4
渗透率k_p/m²	1×10^-11、1×10^-12	Biot-Willis系数α_B	0.3	曲折因子α_∞	3.636 9、4.044 5