基于高强超声波的电力隧道火灾烟雾颗粒试验研究Experimental Study on Fire Smoke Particles of Power Tunnel by High-power Ultrasonic Wave
吕洪坤,陈云,毛智超,郭玉鑫,余斌,张光学
LYU Hongkun,CHEN Yun,MAO Zhichao,GUO Yuxin,YU Bin,ZHANG Guangxue
摘要(Abstract):
针对地下电缆发生火灾时面临的消烟手段不足问题,采用数值模拟技术,设计了一款能够在空气介质中工作的高强超声波换能器。将此换能器作为超声声源,进行了超声波团聚消除电缆烟雾颗粒试验,研究了在声波作用下固相及液相烟雾的透光率及能见度的变化。结果表明:该换能器工作稳定,谐振频率为20 kHz左右,声压级可达150 dB;高强超声场能够迅速提高电缆火灾烟雾的透光率及能见度,当团聚对象为固相颗粒火灾烟雾时,50 s作用时间后,火场能见度可达到人员逃生阈值;当团聚对象为液相颗粒火灾烟雾时,12 s时即可达到人员逃生阈值。
Given inadequate smoke abatement measures in the case of underground cable fire,a high-power ultrasonic transducer that can work in the air is designed using numerical simulation technology. The transducer is used as an ultrasonic sound source to experimentally investigate the acoustic agglomeration effect of eliminating cable smoke particles. The change of transmittance and visibility of solid and liquid phase fire smoke is studied. The results show that the transducer works stably with resonance frequency being 20 kHz and the sound pressure level up to 150 dB. The high-power ultrasonic field can quickly increase the light transmittance and visibility of the cable fire smoke. When the fire smoke consists of solid-phase particles,after 50 s of action time,the visibility of the fire field can reach the personnel escape threshold. For fire smoke dominated by liquid phase particles,the personnel escape threshold can be reached at only 12 s.
关键词(KeyWords):
超声波;声波团聚;火灾烟雾;电力隧道;透光度;能见度
ultrasonic wave;acoustic agglomeration;fire smoke;power tunnel;transmittance;visibility
基金项目(Foundation): 国家自然科学基金资助项目(51876197);; 国网浙江省电力有限公司科技项目(5211DS190035)
作者(Author):
吕洪坤,陈云,毛智超,郭玉鑫,余斌,张光学
LYU Hongkun,CHEN Yun,MAO Zhichao,GUO Yuxin,YU Bin,ZHANG Guangxue
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- 超声波
- 声波团聚
- 火灾烟雾
- 电力隧道
- 透光度
- 能见度
ultrasonic wave - acoustic agglomeration
- fire smoke
- power tunnel
- transmittance
- visibility