摘要
连续铸造二次冷却(连铸二冷)中常用的喷嘴为内混式气水雾化喷嘴。其所喷射的二冷水对铸坯的质量有着重要的影响。根据某钢厂所用的内混式喷嘴数据,介绍了喷嘴雾化的原理,对常用工况下喷嘴内部的喷射芯喷出的液柱破碎情况进行了理论计算。采用CFD软件建立了喷嘴的物理模型,对其内部流场进行了数值模拟。根据模拟结果,分析了液柱在不同工况下的形态变化;计算了液柱We数的模拟值并与理论值进行了对比。综合考虑液柱形态及We数,表明增加进气压力能有效提升液柱破碎的程度,工况3(水压0.2 Mpa,气压0.2 Mpa)及工况4(水压0.2 Mpa,气压0.25 Mpa)具有较好的雾化效果。
The internal air-water mixing atomizing nozzle, by spraying secondary cooling water which has an important influence on the quality of billet, is commonly used in the continuous casting secondary cooling zone. According to the nozzle data of a steel plant, the atomization principle of the nozzle was introduced and the breaking of liquid column injected by the jet core inside the nozzle in common working conditions was calculated through breaking theory. A physical model of nozzle was built and the internal flow field was simulated by CFD software. According to the simulation results, the shape of liquid column in different working conditions was analyzed. A couple of We numbers of liquid column were calculated and were compared with the theoretical ones. Considering the liquid column shape and we number, it indicates that an increasing air intake pressure can effectively improve the breaking of liquid column. Working condition 3 （water pressure 0.2 Mpa, air pressure 0.2 Mpa） and Working condition 4 （water pressure 0.2 Mpa, air pressure 0.25 Mpa） have better atomization effect..
出处
《广东化工》
CAS
2014年第14期7-9,共3页
Guangdong Chemical Industry
关键词
连铸二冷
内混式喷嘴
数值模拟
雾化
液柱破碎
CC secondary cooling
internal mixing nozzle
numerical simulation
atomization
breaking of liquid column
