环氧温度对超音速主射流特性的影响

Effect of shrouding oxygen temperature on characteristics of supersonic oxygen jet

超音速氧气射流喷吹工艺是炼钢过程的重要技术,通过在主氧周围增加环状高温伴随流是改善主氧射流特性、提高冶炼效率的重要途径。通过数值模拟的方法研究集束射流条件下环氧温度对超音速氧气射流特性的影响。研究结果表明,高温环氧可抑制超音速主射流速度的衰减,环氧温度越高,速度衰减越慢,射流核心区长度明显延长;不同环氧温度下,主射流温度均呈现先增大后减小的趋势,环氧温度的升高使得主射流温度的快速增长受到抑制;环氧在主射流周围形成高温低密度区域,将主射流与环境介质隔离,延缓主射流与周围介质的掺混,对主射流起到封套作用。

The process of supersonic oxygen jet injection is an important technology in steelmaking. Accompanied by high temperature flow around the supersonic jet is a good way to improve the velocity and enhance the smelting effi- ciency. The effect of shrouding oxygen temperature on characteristics of supersonic coherent jet has been studied by the numerical simulation. The results show that shrouding oxygen with high temperature can inhibit the velocity de- cay, that is, the higher the shrouding oxygen temperature, the lower the velocity decay. And the length of the jet core area has been prolonged obviously. The static temperature of supersonic coherent jet at the jet centerline increases at first and then decreases at different shrouding oxygen temperature. The shrouding oxygen temperature increasing also inhibits the rapidly increase of the static temperature. The high temperature-low density region,which is formed by the shrouding oxygen around the main jet, separates the supersonic jet from the surrounding environment which will delay the blending of the main jet and the surrounding environment,and play a role in sleeving the main jet.