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。
Mine ventilation frequency wet dust removal system for the heading face of coal mine dust in air.
矿用通风湿式变频除尘系统，用于对煤矿井下掘进工作面的空气进行除尘。
Mine local ventilation facilities failure is one of the main reason which leads to the accident of gas explosions in heading face.
矿井局部通风设备故障是导致掘进工作面较易发生瓦斯爆炸事故的主要理由之一。
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