炼钢转炉顶吹氧气射流特性的CFD数值分析

联合标准的k~ε湍流模型，建立了转炉顶吹可压缩氧气射流的CFD模型.对氧气在拉瓦尔喷管内外的射流行为进行了数值模拟研究，考察了不同操作压力以及环境温度下氧射流的流动行为，并分析了射流激波现象.实验结果表明，当操作压力小于设计压力时，喷管出口处形成斜激波，压缩波与膨胀波交替进行；当操作压力大于设计压力时，喷管出口形成扇形膨胀波，膨胀波与压缩波交替进行.模拟结果也表明，环境温度增加，射流动压基本不变，但超音速区长度增加.通过回归分析，给出了射流核心长度与操作压力的定量关系.

Numerical Analysis on Oxygen Jet Characteristic for BOF Convertor Top-Blown Process Based on CFD Method

Considering standard k~ε model， a CFD model of compressible oxygen jet was developed for BOF convertor top blown process. Jet behaviors inside and outside de Laval nozzle were simulated. Flow characteristics of oxygen jet on the condition of various operating pressures and ambient temperatures were investigated and shock waves of jet were expounded. The numerical simulation results showed that when the operating pressure is under the design pressure， the oblique shocks are formed from the nozzle corner and alternate between compression waves. When the operating pressure is beyond the design pressure， a fan of expanding wave is released from the nozzle corner and expansion and alternate between expansion and compression waves. Simultaneously， the numerical simulation also showed that the length of supersonic region of jet increases with the increased ambient temperature， but kinetic pressure of jet is not influenced. Finally， the quantitative relationship between the length of supersonic region of jet and operating pressure is obtained.