The calculation models are set up on average speed and Max speed in back field and jet effect distance, new theoretical reference is provided for effective ventilation in heading fa.
给出了回流区平均速度、最大回流速度及射流作用距离的计算模型，为掘进工作面合理有效通风提供了新的理论依据。
The effect of working parameters on the erosion performance of underwater jet is investigated, such as , simulated depth, stand off distance and exposure time.
试验研究了模拟水深、靶距及冲蚀时间对水下射流性能的影响关系，较全面地揭示了水下射流的特性。
The result indicates that, when the jet is acting on the vortex directly, the effect depends on the original distance and relative strength between them;
结果表明：当喷流直接作用于涡时，其效果主要取决于两者之间的初始距离及相对强度；
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