Knife edge nozzle 刀刃喷嘴
The upper edge of spray near the nozzle would ignite first for its appropriate fuel concentration and higher temperature.
油孔附近的油束上边缘处具有合适的燃料浓度和较高的温度，最先发生自燃；
The maximum cutting stress lie of the radial distance of 0.5 double diameter nozzle, while the maximum pull stress lie in the surface edge of the rock.
岩石破坏时最大剪应力位于0.5倍喷嘴直径的径向距离处，同时在固体介质表面边缘产生最大拉应力。
Analysis shows that the reason of improper flow field distribution caused by DTH bit is that the nozzle position is close to the edge of bit.
分析认为，该潜孔钻头导致井底流场分布不合理的原因在于喷嘴安放位置太靠近钻头边缘。
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