Study on Measurement and Change Law of Wind Speed in Cross Section of Coal Mine Ventilation Roadway

In this paper, the Prandtl turbulent mixing length theory and the Boussinesq theory were used to analyze the distribution law of the wind speed field in the roadway, the logarithmic distribution formula of the wind speed field under the turbulent flow pattern of the roadway was obtained. The wind speed of the roadway in Gucheng Coal Mine was tested by CFD15 ultrasonic wind meter. The results show that the instantaneous wind speed shows typical pulsation characteristics in the steady flow motion of the roadway, and the average pulsation amplitude can be up to 67% of the average wind speed; the logarithmic distribution formula ideally describes the variation law of the wind speed field of the roadway section, the correlation between the test results of the wind measurement station in 1306 return airway and the logarithmic function is as high as 96%.