环境压力对超音速氧气射流特性影响的数值模拟

Numerical simulation on effect of environment pressure on supersonic oxygen jet characteristics

超音速氧气射流技术是炼钢精炼过程中的重要环节,关于常压条件下超音速氧气射流的特性已进行了大量的研究,但对真空精炼过程中低压环境下的超音速氧气射流特性目前研究较少。通过数值模拟的方法研究了不同环境压力条件下超音速氧气射流的特性,并与试验结果进行了对比分析。研究结果表明:低压环境条件与高压环境条件相比,超音速氧气射流速度的衰减受到抑制,射流核心段的长度得到延长;不同环境压力条件下,射流压力与射流速度分布趋势一致,均沿轴向不断降低,但压力衰减程度大于速度衰减的程度;不同环境压力条件下,氧气射流的温度随着氧气射流的扩散不断升高,最终趋于环境温度。

Supersonic oxygen jet technology is an important part in the steel refining process. The characteristics of supersonic oxygen jet under the atmospheric pressure have been studied abundantly, however, supersonic oxygen jet under the low pressure in the vacuum refining process has only been studied insufficiently. The characteristics of supersonic oxygen jet under different atmospheric pressure were researched by numerical simulation and compared with the experimental results. The results show that the velocity attenuation of supersonic oxygen jet was inhibited and the jet core length was extended under low pressure compared with that under high pressure conditions; the pressure distribution of jet under different environment pressures reduced along the axis. It showed the same trend with the velocity distribution, while the degree of pressure attenuation was greater than that of velocity; the temperature of supersonic oxygen jet under different environment pressure became increasingly higher in the diffusion of oxygen jet, and finally tended to environment temperature.