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用数值模拟的方法研究了符合井底边界条件的轴对称单喷嘴淹没非自由射流流场，给出了不同喷嘴直径、不同喷速、不同喷距下的流场矢量图，并研究了上述工况下的射流轴心速度衰减规律。结果表明，除射流区、撞击区、漫流区、返回区之外，还存在一明显的回流旋涡区，射流出口雷诺数对轴心速度衰减的影响很小，而漫流的存在使得射流轴心速度在靠近井底的区域内受到很大程度的影响．数值模拟结果和有关实验数据有较好的一致性。
The flow field of submerged non-free jet with axisymmetric single nozzle which meets well bottom boundary conditions was studied by numerical simulation. The flow field vector of different nozzle diameter, different jet velocity and different jet pitch was given. Under the condition of the jet axis velocity decay law. The results show that in addition to the jet zone, the impact zone, the diffusive zone and the return zone, there is an obvious backflow vortex zone. The Reynolds number of the jet outlet has little influence on the axial velocity decay. The presence of the diffusive flow makes the jet axial velocity In the area near the bottom of the well is greatly affected. The numerical simulation results are in good agreement with the experimental data.