通过改变喷嘴入口压力、钻头保径宽度、喷嘴直径等影响因素，来研究井底流场的变化。
By changing the nozzle inlet pressure, drill gage width, nozzle diameter factors, to study the changes in these flow fields.
分析了流场的总体特点，得出了喷嘴孔径对PDC钻头井底流场的各种影响。
The overall characteristics of flow field are analyzed and various influences of nozzle diameter on the downhole flow field of PDC bits are obtained.
以井底速度和压力作为目标函数，对旋转射流喷嘴结构参数进行了优化。
Taken the velocity and pressure at the bottom as the objective function, the structure parameters of rotary nozzle were optimized.
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