随着近些年综采工艺的快速革新，选用大采高综采的煤矿越来越多。大采高综采面因其采煤机滚筒直径大，截割粉尘产生量也远高于普通采高，且各类大型设备的存在使得风流分布变化规律复杂，工作面空间内不同高度，不同区域的粉尘浓度分布情况也均有不同。粉尘会对矿工的健康和煤矿的安全开采造成严重的危害。由此可见，研究确定综采工作面内粉尘浓度分布的沿程变化趋势，能够帮助找到重点防尘区域，为降低粉尘危害提供理论基础。

本文以气固两相流、粉尘性质等理论为基础，通过现场测定、理论研究、相似实验和数值模拟相结合的方法，对大采高综采工作面粉尘运移和分布规律进行研究。主要研究内容和成果如下:

首先，通过现场观测，测定了综采面粉尘样品的产尘能力、粉尘分散度和浓度等参数，以实测数据分析计算结果为依据，确定模型边界条件、离散相及连续相参数，为搭建综采面相似实验平台和模拟整个综采工作面空间内的粉尘运移扩散规律建立了基础。

其次，基于相似理论和流体力学相关知识，得出了综采面相似实验需要满足的相似准则，自行设计搭建了1:5的大尺寸综采面相似模拟实验系统。根据实验台实际尺寸，设计了相似实验的内容和具体实验步骤。通过开展相关实验，得到了综采面巷道内风流分布规律以及不同风速情况下不同粒径粉尘在巷道沿程上的粉尘浓度分布情况。

最后，开展数值模拟，研究了风速为2.0 m/s时大采高综采工作面的风流分布情况、采煤机截割粉尘质量浓度分布规律和主要影响因素。并通过调整参数，模拟不同风速对呼吸带粉尘质量浓度、风流分布的影响以及综采面多尘源粉尘分布规律。

根据研究结果，大采高综采工作面风流的变化及分布受工作面障碍物影响明显，在规程范围内，风速越大，越有利于降低工作面粉尘浓度，但风速过大容易造成二次扬尘，得出6m大采高工作面入口风速不应低于2m/s，因此该矿工作面的风速设定是合理的。

With the speedy innovation of thoroughly mechanized mining technological know-how in latest years, extra and extra coal mines select giant mining top entirely mechanized mining. Due to the giant diameter of the shearer drum in the totally mechanized mining face with massive mining height, the quantity of slicing dirt is additionally a great deal greater than that in the normal mining top, and the existence of various large-scale equipment makes the variation law of air flow distribution complex. The dust concentration distribution in different heights and regions in the working face space is also different. Dust will cause serious harm to the health of miners and the safe mining of coal mines. It can be seen that studying and determining the variation trend of dust concentration distribution in fully mechanized mining face can help to find key dust-proof areas and provide a theoretical basis for reducing dust hazards.

Based on the theories of gas-solid two-phase waft and dirt properties, this paper research the migration and distribution regulation of flour dirt in wholly mechanized mining with massive mining peak via the aggregate of area measurement, theoretical research, comparable test and numerical simulation. The principal lookup contents and outcomes are as follows:

Firstly, via discipline observation, the parameters such as dirt manufacturing capacity, dirt dispersion and awareness of dirt samples in totally mechanized mining face are measured. Based on the evaluation and calculation effects of measured data, the mannequin boundary conditions, discrete segment and non-stop segment parameters are decided, which establishes a foundation for building a similar experimental platform in fully mechanized mining face and simulating the dust migration and diffusion law in the whole fully mechanized mining face space.

Secondly, based totally on the similarity principle and associated expertise of hydrodynamics, the similarity criteria that need to be met in the similarity experiment of fully mechanized mining face are obtained, and a 1:5 large-scale similarity simulation experiment system of fully mechanized mining face is designed and built. According to the actual size of the test-bed, the contents and specific experimental steps of similar experiments are designed. Through relevant experiments, the air go with the flow distribution regulation in the roadway of absolutely mechanized mining face and the dirt awareness distribution of exceptional particle sizes alongside the roadway below exclusive wind speeds are obtained.

Finally, the numerical simulation is carried out to find out about the air drift distribution in the entirely mechanized mining face with giant mining top, the distribution law of dust mass concentration cut by shearer and the main influencing factors when the wind speed is 2.0m/s. By adjusting parameters, the consequences of extraordinary wind speeds on dirt mass attention and air drift distribution in respiratory region and the distribution regulation of multi dirt supply dirt in wholly mechanized mining face are simulated.

According to the lookup results, the alternate and distribution of air glide in the thoroughly mechanized mining face with giant mining peak are for sure affected with the aid of the limitations in the working face. Within the scope of regulations, the higher the wind speed is, the more conducive it is to reduce the dust concentration of working flour. However, immoderate wind pace is effortless to reason secondary dust. It is concluded that the top of the line air flow wind velocity of 6m excessive mining face is about 2.0 m/s. Therefore, the wind speed setting of the working face of the mine is reasonable.

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