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为有效控制硬岩综掘面产生的高浓度粉尘向有人作业区域扩散,应用Fluent软件,基于欧拉-拉格朗日(Eulerian-Lagrangian)气-尘颗粒两相流动数学模型,通过数值模拟研究旋流风幕扰动硬岩综掘面风-尘流场的变化。结果表明:旋流风幕的扰动使距硬岩综掘面0~15 m区域内的风流场,由紊乱转变为在掘进机司机前方形成均匀压向掘进工作面的风幕,将掘进工作面产尘有效控制在司机前方区域。根据模拟结果,研制新型硬岩综掘面旋流风幕控尘系统。现场试验结果表明:粉尘浓度实测值和模拟值的相对误差小于8.72%,验证了模拟结果的准确性。旋流风幕扰动后,现场有人作业区域的最高粉尘质量浓度降至23.5 mg/m3,平均降尘率高达95.18%。
In order to effectively control the diffusion of high-concentration dust generated from the hard rock encaustment surface into the manned working area, a numerical simulation was carried out using Fluent software based on the Eulerian-Lagrangian gas-dust particle two-phase flow mathematical model Vortex wind curtain perturbation of hard rock comprehensive face air - dust flow field changes. The results show that the turbulence of the swirling air curtain changes the wind field from 0 ~ 15 m away from the hard rock excavation face into a wind screen with a uniform pressure to the heading face in front of the driver of the boring machine, Dust effective control in the driver’s front area. According to the simulation results, a new type of hard rock comprehensive excavation surface swirling curtain air curtain dust control system was developed. The field test results show that the relative error between the measured value and the simulated value of dust concentration is less than 8.72%, which verifies the accuracy of the simulation results. After the swirling air curtain perturbed, the highest dust concentration in the work area of the site was reduced to 23.5 mg / m3 and the average dustfall rate was as high as 95.18%.