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；
2
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。
3
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.