针对综掘工作面长压短抽通风方式中单向旋流风幕难以径向覆盖巷道全断面、阻尘效率低、使用不便等问题，本项目拟提出三维多向旋流风幕理论，并研究其阻隔粉尘弥散的机理与应用技术。建立掘进机截割头破碎煤岩体产尘的数学模型，采用EDEM软件数值模拟截割产尘规律，完善掘进机截割产尘机理，并实验测定粉尘颗粒特性；综合连续介质模型与颗粒轨道模型的优点构建气体－粉尘颗粒两相流动数学模型，对综掘工作面压风量、压抽比、轴径比等通风参数影响三维多向旋流风幕风流场形成、运移及阻隔粉尘弥散的规律进行数值模拟，并结合基于长压短抽式通风综掘工作面仿真实验系统的实验结果，得出综掘工作面三维多向旋流风幕影响粉尘流场弥散的规律，优化风幕发生装置性能，确定三维多向旋流风幕阻隔粉尘弥散的机理，提出适合综掘工作面的三维多向旋流风幕阻隔粉尘弥散理论与技术，以有效降低粉尘浓度。

Unidirectional whirling air curtain in fully-mechanized excavated faces with long–pressing and short–pumping ventilation style is difficult to radially cover the whole section of roadway, inefficient on blocking dust and inconvenient in use. In order to solve the above problems, this project intends to put forward the theory of three-dimensional and multi-directional whirling air curtain, also aimed to study the mechanism and application technology about this kind air curtain blocking dust dispersion. A mathematical model which simulates the generation process of cutting dust when roadheader’s cutting heads crush coal and rock mass needs to be established. The generation rule of cutting dust is numerically simulated with the software EDEM, which is helpful to perfect the generation mechanism of cutting dust.Meanwhile dust particle characteristics need measuring through experiment. Integrated the advantages of continuum model and particle rack model, gas and dust particles two-phase flow mathematical model should be established.Furtherly, the rules of each ventilation parameters such as pressure air volume, pressing and pumping air volume ratio and axial and radial air volume ratio affecting the generation, migration and the ability to block dust dispersion of three-dimensional and multi-directional whirling air curtain field is numerically simulated with the above model. Then combined with the experimental results based on the simulation experiment system about fully-mechanized excavated faces with long–pressing and short–pumping ventilation style, the rule of three-dimensional and multi-directional whirling air curtain affecting the dispersion of dust flow field in fully-mechanized excavated faces can be conducted, which is useful to optimize the performance of air curtain generator, determine the mechanism of three-dimensional and multi-directional whirling air curtain blocking dust dispersion and put forward the corresponding dust blocking theory and technology suitable for fully-mechanized excavated faces. Only with these methods can the concentration of dust in fully-mechanized excavated faces be more effectively reduced.