Experimental Study on Fire Smoke Particles of Power Tunnel by High-power Ultrasonic Wave

Abstract

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.

Keywords

• ultrasonic wave
• acoustic agglomeration
• fire smoke
• power tunnel
• transmittance
• visibility