Studies With Forced Ventilation Airflow Flow Field Numerical Simulation Tunneling Face

In the mining industry of our country, the roadway drivage is one of the most importantworkplaces, worker’s health and safety are directly affected by the environmental conditions ofworkplace, so in the process of forced ventilation in heading face, the study of flowfielddistribution rule and influencing factor is of great importance to dust control and safetyproduction, which has very important practical significance to worker’s life and property security.According to the actual conditions of laneway airflow and flowfield distribution, physicaland mathematical models of airflow field in forced ventilation were established on the basis of jettheories, aerodynamics, fluid mechanics and computational fluid dynamics by software fluent,boundary conditions were also confirmed. Laneway airflow was described by RNG k-ε modeland wall functions, so flowfield distribution and jet velocity variation were obtained throughnumerical simulation on the process of laneway forced ventilation. On the basis of crediblenumerical simulation, flowfield variation and airduct axial velocity were studied through differentcharacteristic parameters of laneway restrained wall-attached jet, parameters include airduct exitlocation, diameter, outlet air velocity and the distance to working face. The effects of theseinfluencing factors on flowfield distribution were obtained.The numerical simulation results show that: the laneway forced ventilation flowfield isdivided into wall-attached jet zone, impinging jet mural zone, recirculation zone and eddy zone;airduct exit located in the laneway vertex angle is conducive to enlarging the jet effective range;jet restrained degree will affect flowfield greatly; the axial velocity is little influenced by airductoutlet air velocity; the effective range should be greater than the distance between airduct exit toheading face in local ventilation; the larger the ratios of width to height, the better the coandaeffect of the jet. The numerical simulation results are in good agreement with site test andtheoretical calculation, which could prove the effectiveness and applicability of models andnumerical method, and offer theoretical basis for airflow transmission process, dust migration lawand ventilation efficiency.The study could offer reliable theoretical reference for preventing dust accumulation in thelaneway, provide theoretical direction and technical support for local ventilation, thus ensuringmine safety production.