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.