Abstract Dust is one of the main disasters in underground tunneling. This study developed and verified a novel dust suppression device, which was systematically tested in laboratory and field conditions. Based on the basic principle of the Coanda effect, with a small amount of compressed air as power supply, and through a uniform layout of circular hole for high-speed jet to drive the center air movement together thus forming the entrainment effect, the main structure of the new dust removal device was designed. The external dusty air is then drawn in and the dust is removed by water spray. According to laboratory experiments, the optimal structural parameters for the inlet inclination angle θ1, the outlet inclination angle θ2, and the number of the compressed drainage gas nozzle n were determined. It was found that when the inlet angle is 15° and the outlet angle is 5°, the Coanda effect is the most significant, and the suction rate of the dust removal device is the highest. With the increase of the number of gas orifices n, the suction rate firstly increased and then decreased. In addition, through numerical simulation, the optimal position of the spray nozzle is determined. In field tests, compared to that of the original dust removal device, the new device improved respirable dust and total dust suppression efficiencies by 30.5% and 11.5% (A: the motorman position), 56.2% and 24.5% (B: Behind the drilling machine), 69.4% and 21.6% (C: 20 m behind the drilling machine), respectively, thus the new technology effectively improves the atmosphere in the mechanized underground coal mines, creating a safer and healthier working environment.

中文翻译：

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一种用于地下隧道的创新抑尘装置

摘要 粉尘是地下隧道施工的主要灾害之一。本研究开发并验证了一种新型抑尘装置，并在实验室和现场条件下进行了系统测试。基于附壁效应的基本原理，以少量压缩空气为动力，通过均匀布置的圆孔高速喷射，带动中心空气一起运动从而形成夹带效应，主体结构设计了新型除尘装置。然后吸入外部含尘空气，并通过喷水去除灰尘。根据室内试验，确定了进口倾角θ1、出口倾角θ2和压缩排水气体喷嘴数量n的最佳结构参数。发现当入口角度为15°，出口角度为5°时，附壁效应最显着，除尘装置的吸入率最高。随着气孔数量n的增加，吸入率先增大后减小。此外，通过数值模拟，确定了喷嘴的最佳位置。在现场测试中，新装置与原除尘装置相比，可吸入粉尘和总抑尘效率分别提高了30.5%和11.5%（A：司机位置）、56.2%和24.5%（B：钻孔后）机）、69.4% 和 21.6%（C：钻机后面 20 m），从而新技术有效改善了机械化地下煤矿的气氛，创造了更安全、更健康的工作环境。