摘要
声波可以提高固体颗粒的流化质量是因声波振动破坏粒子间的作用力以及影响气体介质的流动特性。因此了解床内声场分布特性,对分析声波对气体介质的作用,从而应用声波技术改善流化质量具有重要意义。实验研究了声波频率、扬声器功率和布风板开孔率等参数对无颗粒情况下床内声场的影响。实验研究表明,当声波频率低于截止频率时,床内声压级随频率增大而增大;声波频率高于截止频率时,床内声压级随频率增大而减小;且扬声器功率越大,床内声压级也增大,扬声器功率由75 W提高到125 W时,床内整体声压级可以增加10 d B以上;而布风板开孔率对床内驻波场的分布影响较小,且不影响声压级的整体大小。
Sound waves can improve the fluidization quality of solid particles because acoustic vibration destroys the forces between particles and affects the flow characteristics of gas medium.Therefore,understanding the distribution characteristics of sound field in the bed is of great significance for analyzing the effect of acoustic wave on gas medium and applying acoustic technology to improve fluidization quality.The effects of acoustic frequency,loudspeaker power and air distributor aperture ratio on the sound field in the bed without particles were studied experimentally.Experimental research shows that when the acoustic frequency is lower than the cut-off frequency,the sound pressure level increases with the increase of frequency;when the sound wave frequency is higher than the cut-off frequency,the sound pressure level in the bed decreases with the increase of the frequency;and the higher the speaker power,the higher the sound pressure level in the bed.When the speaker power is increased from 75 W to 125 W,the overall sound pressure level in the bed can be increased by more than 10 dB.However,the opening ratio of air distributor has little effect on the distribution of standing wave field in the bed,and does not affect the overall size of sound pressure level.
作者
兰江
傅永平
杨光弟
LAN Jiang;FU Yongping;YANG Guangdi(College of mathematics and physics,Dianxi normal university of science and technology,Lincang 677000,China)
出处
《黑龙江电力》
CAS
2021年第2期150-155,共6页
Heilongjiang Electric Power
关键词
流化床
驻波
频率
功率
开孔率
fluidized bed
standing wave
frequency
power
open porosity
