建立了喷管潜入段二维两相冷流实验设备，进行了相应的实验。实验清晰地显示了在潜入喷管进口背壁凹区旋涡的产生、稳定、消失，以及粒子的冲刷、粘贴、脱落、沉积等反复作用的复杂现象，它们与流动的雷诺数、粒子的含量和尺寸、潜入喷管进口处的形状和潜入深度、背壁型面等因素有关。 A two-dimensional two-phase cold flow experimental equipment of the nozzle submerged section was established and corresponding experiments were carried out. Experiments clearly show the complex phenomena of vortex generation, stability, disappearance, and repeated actions of vortexing, adhering, dropping and deposition of vortices in the dorsal recess of the inlet of the nozzle. They are related to the Reynolds number of flow, the content of particles and Size, sneak into the nozzle at the entrance shape and the depth of infiltration, back wall profile and other factors.