Abstract: The velocity distribution of centre axis jet flow with sub-hole pressure0.12～0.20 MPa,the effect of sub- hole pressure and  ambient temperature(300~2000 K) on velocity distribution of jet cross section,and the effect of ambi- ent temperature on rule of velocity attenuation at centre axis jet have been analyzed by commercial software Fluent and using numerical simulation method. Results showed that the amount of entrapped and absorbed ambient medium could obviously decreased as centre jet flow was protected by high temperature and low-density concomitancy flow and the attenuation of ve- locity of centre axis jet flow was slowed down to markedly increase the length of core zone.

Key words: Numerical Simulation,Low Density Concomitancy,Turbulence Jet

摘要： 借助商业软件Fluent,采用数值模拟的方法,分析了副孔压力0.12～0.20 MPa时中心射流轴线上速度分布,副孔压力和环境温度(300～2000 K)对射流横截面速度分布的影响,以及环境温度对中心射流轴线上速度衰减规律的影响。结果表明,中心射流在高温低密度伴随流保护下,可显著减少对周围介质的卷吸量,更大程度减缓轴线上速度衰减,使核心区长度明显增加。

关键词: 数值模拟, 低密度伴随, 湍流射流