摘要
对声波耦合水雾消除火灾烟雾的声团聚技术进行了实验研究,并且深入探究了声团聚的作用机理及微观团聚体结构的样貌,通过改变声波频率、声功率、水雾浓度和初始烟雾浓度等参数比较其对消烟效果的影响。结果表明,声波耦合水雾技术提高了气溶胶分散性,并且水雾产生的液桥力保证了团聚体结构的稳定性,团聚效率得到提高。在初始烟雾浓度为50 g·m^(-3)、水雾浓度为30 g·m^(-3)、声功率10 W和声波频率1.5 kHz的条件下,烟雾颗粒数目减少了80%以上。添加水雾后颗粒间的相对挟带系数增大,相对运动增强,最佳团聚频率范围得到扩大,透光率最高可达95.1%。然而,水雾浓度需进行一定控制,过高的水雾浓度可能还会造成光线的阻挡。此外,初始烟雾浓度越高,颗粒间距越小,团聚效果也就越明显,该技术适合于烟雾浓度较大的场合。
In this paper,the elimination effect of the acoustic agglomeration technology by acoustic wave coupling water mist on carbon black aerosol is studied through experiments.The results show that the aerosol dispersion is improved by this technology,the liquid bridge force generated by the water mist ensures the stability of the agglomerate structure,and the number of smoke particles decreases by more than 80%at the frequency of 1.5 kHz,sound power of 10 W,initial carbon black aerosol concentration of 50 g·m^(-3 ) and water mist concentration of 30 g·m^(-3).The relative entrainment coefficient between particles increases and the relative motion enhances after adding water mist,meanwhile the best agglomeration frequency range is extended and the transmittance reaches up to 95.1%.However,the excessive concentration of water mist may block the light due to scattering and absorption.In addition,it is found that the agglomeration rate of thick aerosol is much higher than that of thin aerosol.This technology is more suitable for occasions with high aerosol concentration.
作者
姚辉辉
张光学
吴林陶
陈子越
庞颖钢
林宸煜
YAO Huihui;ZHANG Guangxue;WU Lintao;CHEN Ziyue;PANG Yinggang;LIN Chengyu(Institute of Energy Engineering,China Jiliang University,Hangzhou 310018,Zhejiang,China)
出处
《声学技术》
CSCD
北大核心
2022年第1期7-13,共7页
Technical Acoustics
基金
国家自然科学(51876197)
浙江省属高校基本科研业务费专项资金
浙江省新苗人才计划(2020R409045)
中国计量大学学生科技专项(2020YW44)资助项目。
关键词
声波团聚
水雾
火灾烟雾
能见度
透光率
团聚效率
acoustic agglomeration
water mist
fire smoke
visibility
transmittance
agglomeration efficiency
