By changing the nozzle inlet pressure, drillgage width, nozzle diameter factors, to study the changes in these flow fields.
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。
2
The overflow tank level and the speed of both the role of Chip can be changed by changing the factors such as the nozzle inlet pressure, drillgage width, nozzle diameter of the PDC bit.
改变喷嘴入口压力、钻头保径宽度、喷嘴直径等影响因素对改变井底漫流层和排屑槽内的速度都有作用；
3
Its main functions are maintaining borehole gage, improving drill string stability and protecting lower drill string from excessive wear.