人员对巷道风速测量影响的数值模拟分析

Numerical Simulation Analysis of Pedestrian's Influence on Airflow Velocity Measuring in Roadway

为探究造成矿井风速测量读数振荡的原因,更准确地选择测量位置与测量方法,利用数值模拟的手段,根据现场实际,选取了测风点之前有行人干扰的5个情况,对在其影响下的风流速度场进行数值模拟。揭示了不同干扰情况下的巷道风流速度分布特征,分析了人的阻碍对风速测量的影响范围。其中,当单人站在巷道侧时,身后迎风向左侧的振荡区域充分发展,在其后20 m处测点的风速差依然有0.76 m/s;情况5为3个人在其身后形成的振荡区域互相影响抵消,在其后20 m处的速度差只有0.04 m/s。结果表明:由于人的存在,在人后方会形成风流的速度振荡区域,其正后方速度减小,两侧速度增大,若振荡充分发展则其衰减较慢。模拟结果对井下风速测量有一定的实际应用与参考价值。

To explore the cause of airflow velocity reading disorder and accurately select the surveying location and meth- ods, the numerical simulation was adopted to selecting five typical situations that are disturbed by the pedestrian to simulate the airflow field affected by the pedestrian. Then the distributive characteristic of airflow velocity was revealed in different situa- tion, and the range of the pedestrian＇s itffluence on the airflow velocity measuring was analyzed. Among them, when one person stands on the side of roadway, the oscillating area the behind the wind to the left has full development, and the velocity differ- ence is still to be 0.76 m/s at the monitoring line 20 m behind the people. At situation 5, the oscillation areas behind three people are balanced out with each other, and the velocity difference is only to be 0.04 m/s at the monitoring line 20 m behind the people. The conclusions showed that due to the person＇s existence,there will be a velocity disorder region behind the per- son. The velocity will be slow down behind person but it will be increased at his side. The oscillation will be attenuated slowly if let it grow freely. The simulation result has certain reference and practical application value for measuring airflow velocity at underground.