船用细水雾灭火喷头结构优化与分析

根据液体的雾化和灭火机理，对细水雾的液滴形成和破碎过程、影响液体雾化的因素、多种船用细水雾喷头结构的优劣进行分析，得到细水雾雾化对喷头的基本要求。设计船用喷头采用螺旋内流道，使液体在室内进行强烈的旋转，以提高水雾动能，加强离心雾化效果，增强灭火能力。运用STAR-CCM+对直射式喷头和改进的离心喷头进行对比分析，得到流场以及流场内有关面上的压力、速度、流动迹线以及液相水的体积分数。结果表明，螺旋流道的离心结构喷头可以增大喷雾半径、扩大保护范围、提升灭火效果。

Structure optimization and analysis of marine water mist fire extinguishing nozzle

According to the atomization and fire extinguishing mechanism of the liquid, analyze the droplet formation and breaking process of the water mist, the factors that affect the atomization of the liquid, and the advantages and disadvantages of various marine water mist nozzle structures to obtain the basic requirements of water mist atomization for nozzles. The design of marine sprinklers uses spiral internal flow channels to make the liquid rotate strongly at indoors to increase the kinetic energy of the water mist, enhance the centrifugal atomization effect, and enhance the fire extinguishing capability. Using STARCCM+to compare and analyze the direct jet nozzle and the improved centrifugal nozzle, the flow field and the pressure, velocity, flow trace and the volume fraction of liquid water on the relevant surface in the flow field are obtained. The results show that the nozzles with a centrifugal structure with spiral flow channel can increase the spray radius, expand the protectionrange, and enhance the fire extinguishing effect.