通过对稳定悬浮在冲击水柱上方的轻质球形物体进行预实验猜想，判断出其稳定悬浮条件与水柱冲击点位置相关.在对水柱冲击点进行速度方向的分解后，由康达效应得知流体流经弯曲物体表面过程中存在相互作用力，遂试图利用边界层理论对物体进行受力分析，进而给出物体横向受力的表达式.解释了物体在水柱冲击点稍偏离平衡冲击位置时，物体所受到的类似“回复力”的现象.通过实验测量结果验证了此理论的自洽性.

Through the preparatory experiment conjecture of the light spherical object suspended

above the im- pact water column，it is judged that the stable suspension condition is related to

the impact point position of the water column. After decomposing the impact point of water column

in the direction of velocity，it is known from the Coanda effect that there is interaction force in

the process of fluid flowing through the curved object surface. Therefore，the boundary

layer theory is used to analyze the force on the object，and then the expression of the transverse

force on the object is given. The similar“recovery force”is explained when the impact point of water column

slightly deviates from the equilibrium impact position. The self-consistency of the theory is

verified by the experimental results.