井下巷道变化会对风流产生扰动，对巷道内原稳定的风流状态产生影响，在布置断面风速测点时须考虑避开其影响范围，以保证测定数据的准确性。为研究巷道扰动条件对巷道内风流的影响程度和影响距离，归纳各扰动条件下紊流充分发展所需的流程长度。研究采用数值模拟的方法，分别建立巷道弯曲、巷道断面突变和巷道斜交叉扰动条件下的风流扰动流体模型，并利用FLUENT软件对不同风速条件下扰动模型进行模拟计算。分析结果显示：紊流充分发展流程长度与入风端风速的变化影响较小，巷道内风速的变化对紊流充分发展流程长度影响不大；不同扰动条件在同一巷道粗糙度下紊流充分发展流程长度不同，巷道直角转弯对风流扰动距离为24.14 m，巷道突变（突扩）对风流扰动距离为12.25 m，巷道汇风对风流扰动距离为27.93 m，巷道分风对风流扰动距离为33.45 m。研究成果可为矿山井下通风系统监测点布置提供理论指导，对提高相应条件的通风监测准确性具有重要意义。

Changes in underground roadways can disturb airflow,affecting the original stable airflow state.It is essential to consider avoiding the influence range of such disturbances when placing cross-sectional wind speed monitoring points to ensure data accuracy.To investigate the extent and range of roadway disturbance conditions effect on airflows inside roadways,the required flow lengths for fully developed turbulence under various disturbance conditions were summarized.Numerical simulation was employed to establish airflow disturbance fluid models under different scenarios,including roadway bends,abrupt changes in cross-section,and intersections.FLUENT software was used to simulate and calculate the disturbance models under varying wind speeds.The results indicate that the fully developed turbulence flow length is minimally influenced by variations in wind speed at the inlet,and changes in airflow speed inside the roadway have a minor impact on the fully developed turbulence flow length.However,the disturbance conditions significantly affect the flow length under the same roadway roughness conditions.Specific findings include:airflow disturbance distance due to right-angle bends is 24.14 m;airflow disturbance distance due to abrupt expansions is 12.25 m;airflow disturbance distance due to merging flows is 27.93 m;airflow disturbance distance due to splitting flows is 33.45 m.These results provide theoretical guidance for the layout of monitoring points in underground mine ventilation systems,which is significant in improving the accuracy of ventilation monitoring under corresponding conditions.