摘要
为了解决细水雾喷头喷雾保护半径小的问题,研制了一种新颖的两级雾化高压细水雾灭火喷嘴。计算了索太尔雾滴直径D_(SM)、喷嘴流速、流量和充分雾化距离。在CFD仿真中,将两级雾化喷嘴的速度场和水体积分数分布与单级雾化喷嘴的对应仿真结果分别进行对比,并优化了两级雾化喷嘴的结构参数。试验测量了D_(SM)、喷雾速度、喷雾密度分布并和仿真结果进行对比验证。研究表明。优化设计后两级雾化喷嘴的喷雾保护半径为0．34m,喷雾密度分布均匀：具有多喷嘴的两级雾化细水雾喷头的喷雾保护半径可以超过2m,在消防领域具有实用价值。
A new kind of two-stage atomizing high pressure spray nozzle for fire suppression is developed, which provides a way to solve the problem that the spray protecting diameter of spray is small. The sauter mean diameter （DsM）, flow velocity of the nozzle, flux and jet breakup length are computed.. In the computational fluid dynamics （CFD） simulation, the spray velocity field and water volume-fraction distribution of the two-stage atomizing nozzle are compared with those of the one-stage atomizing nozzle, respectively, then the struetural parameters of the two-stage atomizing nozzle are optimized. The DSM, spray velocity and spray density distribution are measured to verify the simulation results. The research shows that the optimized two-stage atomizing nozzle has a 0.34 m protection diameter and its spray density distribution is uniform. The protection diameter of the two-stage atomizing spray head with multi-nozzle is more than 2 m, which＇is very practical in fire protection.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2006年第12期122-127,共6页
Journal of Mechanical Engineering
基金
国家'十五'科技攻关项目(2002BA208804)
国家自然科学基金(50005019)资助项目。
关键词
细水雾
喷嘴
雾化
CFD
灭火
Water mist Spray nozzle Atomization Computational fluid dynamics （CFD） Fire suppression
