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首页> 外文期刊>Arabian Journal for Science and Engineering >Optimal Design of Novel Drill Bit to Control Dust in Down-the-Hole Hammer Reverse Circulation Drilling
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Optimal Design of Novel Drill Bit to Control Dust in Down-the-Hole Hammer Reverse Circulation Drilling

机译：新型潜孔锤反循环钻进中控制粉尘的钻头优化设计

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摘要

In pneumatic down-the-hole hammer drilling with reverse circulation, dusty air often escapes from the borehole due to the adverse effects of reverse circulation, which not only pollutes the surrounding environment, but also affects workers' health. In order to address this issue, a new type of drill bit, designed with a swirling generator, has been developed. The computational fluid dynamics code ANSYS Fluent was used to simulate the swirling flow phenomena inside the drill bit, and the simulation results indicate that a stronger swirling flow field can be formed in the drill bit's center passage. This swirling flow has a high entrainment effect, so that negative pressure is generated in the nearest area, which is helpful for improving the reverse circulation effects. Furthermore, a series of experiments were carried out to test the actual performance of the drill bit, and the experimental results exhibit reasonable agreement with the simulation data. The maximum error between the simulated and experimental results is only 9.05%. The mass flow rate of the sucked air increases with an increase in air supply, regardless of whether flushing nozzles are designed for the drill bit. Moreover, the amount of air sucked into the swirling drill bit is greater than that sucked into the annular drill bit under the same conditions; therefore, the swirling drill bit exhibits superior performance.
机译：在具有反向循环的气动潜孔锤钻中，由于反向循环的不利影响，尘土飞扬的空气经常从钻孔中逸出，这不仅污染周围的环境，而且还影响工人的健康。为了解决这个问题，已经开发了一种新型的，设计有旋流发生器的钻头。计算流体动力学代码ANSYS Fluent用于模拟钻头内部的旋流现象，仿真结果表明，在钻头的中心通道中可以形成更强的旋流场。该回旋流具有高的夹带作用，从而在最近的区域产生负压，这有助于改善反向循环效果。此外，进行了一系列的实验来测试钻头的实际性能，并且实验结果与模拟数据显示出合理的一致性。模拟结果与实验结果之间的最大误差仅为9.05％。无论是否为钻头设计了冲洗喷嘴，吸入的空气的质量流量都会随着供气量的增加而增加。此外，在相同条件下，被吸入旋流钻头的空气量大于被吸入环形钻头的空气量。因此，回旋钻头具有优越的性能。

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  • 来源
    《Arabian Journal for Science and Engineering》 |2018年第3期|1313-1324|共12页
  • 作者

    Cao Pinlu; Chen Yunwang; Liu Miaomiao; Chen Baoyi;

  • 作者单位

    Jilin Univ, Coll Construct Engn, 938 Ximinzhu St, Changchun 130061, Jilin, Peoples R China;

    Jilin Univ, Coll Construct Engn, 938 Ximinzhu St, Changchun 130061, Jilin, Peoples R China;

    Jilin Univ, Coll Construct Engn, 938 Ximinzhu St, Changchun 130061, Jilin, Peoples R China;

    Jilin Univ, Coll Construct Engn, 938 Ximinzhu St, Changchun 130061, Jilin, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Drill bit; CFD; Reverse circulation; Swirling flow; Swirler;

    机译：钻头;CFD;反向循环;旋流;旋流器;

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