In response to the serious dust pollution and excessive gas concentration in fully mechanized excavation face, a multi-phase coupling diffusion model of airflow-dust-gas was established, and the influence of pressure pumping ratio and air volume on dust and gas diffusion was studied. The results showed that the dust of the traditional ventilation mode was diffused to the whole roadway, and the high-concentration gas accumulated obviously. However, after adopting the new ventilation mode of large vortex flow, a quantity of dust was controlled in the eddy field, and high-concentration gas was dissipated by strong airflow, so there was no gas accumulation. As the pressure pumping ratio decreases, the extraction effect increases, the eddy current intensity also increases, and the control effect on dust is enhanced. The pressure pumping ratio with the best dust control effect is 0.6, and there is no dust pollution and no gas accumulation in the driver's location. The fixed pressure pumping ratio is 0.6, and the diffusion of dust and gas is not significantly affected by an increase in air volume, but high-speed airflow can dilute and reduce the concentration of dust and gas. When = 600.0 mg/m³, the high-speed airflow can dilute the dust concentration, accelerate the dispersion of high-concentration gas, keep the gas below the safe level, and have a good dust control effect. The increase of air volume will further reduce the dust and gas concentration. This study provides a theoretical basis for the promotion and utilization of new ventilation method on-site.

中文翻译：

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大涡流技术下气流-尘-气耦合扩散多重影响机理研究

针对综采工作面粉尘污染严重、瓦斯浓度过高的问题，建立气流-粉尘-瓦斯多相耦合扩散模型，研究压抽比和风量对粉尘、瓦斯扩散的影响。结果表明，传统通风方式的粉尘向整个巷道扩散，高浓度瓦斯积聚明显。而采用大涡流新通风方式后，涡流场中控制了一定量的粉尘，高浓度气体被强气流驱散，不存在气体积聚。随着压力抽气比的减小，抽气效果增强，涡流强度也增大，对粉尘的控制效果增强。抑尘效果最好的压抽比为0.6，驾驶员所在位置无粉尘污染，无瓦斯积聚。定压抽气比为0.6，粉尘和气体的扩散不受风量增加的明显影响，但高速气流可以稀释和降低粉尘和气体的浓度。当=600.0mg/m3时，高速气流可稀释粉尘浓度，加速高浓度气体的分散，使气体保持在安全水平以下，具有良好的抑尘效果。风量的增加将进一步降低粉尘和气体浓度。本研究为新型通风方式的现场推广应用提供理论依据。