Abstract:In order to study the law of airflow distribution and provide guidance for accurate measurement of airflow in roadways, this paper studies the distribution law of airflow cross-section in circular roadways by means of self-renovation experimental system. The results show that the trend of airflow variation in the same roadway cross-section has nothing to do with the wind speed, and the wind speed decreases gradually along the central line of the roadway to the roadway wall and about 20% of the distance exists a sudden drop area of wind speed. The influence of this area on wind measurement should be taken into account in actual wind speed measurement. At the same time, this paper uses curve fitting method to further analyze the distribution of wind flow in roadways. The fitting has high reliability and can be used to calculate the wind speed at any point in the roadway.