中文摘要：

Oscillation phenomena in far field region of plane jets are studied by lattice Boltzmann method over a range of Reynolds numbers ( Re ) from 16to 65.Numerical results show that the instantaneous centerline velocities show periodic oscillation behavior in far field region when Re>38.In contrast , the periodic behavior is invisible in corresponding flow field when Re≤38.For the cases of Re≤38 , the exchange of momentum due to straining motion gradually dominates the downstream flow filed , which qualitatively suggests the possibility of jet instability.

英文摘要：

Oscillation phenomena in far field region of plane jets are studied by lattice Boltzmann method over a range of Reynolds numbers （Re） from 16 to 65. Numerical results show that the instantaneous centerline velocities show periodic oscillation behavior in far field region when Re〉38. In contrast, the periodic behavior is invisible in corresponding flow field when Re≤38. For the cases of Re≤38, the exchange of momentum due to straining mo- tion gradually dominates the downstream flow filed, which qualitatively suggests the possibility of iet instability.