破坏出现的主要位置应是钻头头部多喷嘴之间的区域、喷嘴本身及其周围区域和筋板及流道的逆压力梯度区。
Bit damage maybe occur on the area of bit wall around the nozzles, nozzles area and inverse pressure gradient area.
在零压力梯度下，这个局部的动量损失几乎是一个附加的常量，而逆压梯度则会扩大这种动量损失。
In zero pressure gradient flow, this local momentum loss is Minost an additive constant quantity. On the other hand, adverse pressure gradient results in amplification of this momentum loss.
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