A cross-section whose axial distance from the round jet spout is thrice the spout diameter was studied, and the distribution of velocity vector at the cross section was obtained.

• 采用3种粒径的玻璃微珠作为示踪粒子，获得了距喷口出口截面轴向距离为3倍喷口内径处的示踪粒子速度矢量分布。