双尘源耦合下呼吸性粉尘扩散的紊流系数求解

发布时间：2018-06-04 15:03

本文选题：呼吸性粉尘质量浓度 + 紊流系数　；参考：《哈尔滨工业大学学报》2017年08期

【摘要】：为完善综采工作面呼吸性粉尘扩散模型,解决模型中紊流扩散系数和紊流纵向弥散系数无法求解问题,根据气溶胶力学和流体动力学理论,结合综采工作面实际环境和呼吸性粉尘二次飞扬特点,建立综采工作面移架产尘点与割煤产尘点耦合下的呼吸性粉尘扩散模型,其中,呼吸性粉尘二次飞扬采用镜像法.再通过相似实验,按照原模比3∶1,搭建综采工作面实验场地,确定采样点,分别测出3种场景下各采样点的风速值与粉尘质量浓度值;结合实验数据,采用梯度下降法求解紊流系数,求解结果用于呼吸性粉尘质量浓度计算.将理论值与实验值对比,结果表明,在258个采样点中,扩散模型的理论值与实测值的平均绝对误差率为29.66%,证明了该理论模型的有效性,可用于实际矿井下工作面呼吸性粉尘质量浓度的预测.
[Abstract]:In order to perfect the breathing dust diffusion model of fully mechanized coal face and solve the problem that the turbulent diffusion coefficient and the turbulent longitudinal dispersion coefficient can not be solved in the model, according to the theory of aerosol mechanics and hydrodynamics, Combined with the actual environment of fully mechanized coal mining face and the characteristics of breathing dust secondary flying, a model of respiratory dust diffusion is established under the coupling of dust producing point of moving frame and dust producing point of cutting coal in fully mechanized coal mining face, in which the second uplift of respiratory dust adopts mirror image method. Through similar experiments, according to the original model ratio of 3: 1, the experimental site of fully mechanized mining face is built to determine the sampling points, and the wind speed and dust mass concentration of each sampling point in three scenarios are measured respectively. The turbulent coefficient was calculated by gradient descent method, and the result was used to calculate the mass concentration of respiratory dust. Comparing the theoretical value with the experimental value, the results show that the average absolute error rate of the theoretical value and the measured value of the diffusion model is 29.66 in 258 sampling points, which proves the validity of the theoretical model. It can be used to predict the quality concentration of breathing dust in actual coal face.
【作者单位】：北京科技大学土木与资源工程学院;首都经济贸易大学安全与环境工程学院;
【基金】：国家自然科学基金(51274024)
【分类号】：TD714.2

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