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Study on Flow field of the Large Via Open-closed Bit Based on CFD
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chongqing research institute of china coal technology and engineering group

Clc Number:

P634.4 1

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    Abstract:

    The computational fluid dynamics (CFD) method is employed for numerical simulating the flow field in the bit which can be opened and closed with large via. Analysis was made on the speed field under different flow conditions, the optimum drilling air volume is acquired and the “obstruction vortex” is found in the flow field. And through the analysis on the pressure field under the optimal flow conditions, the existence of “suction pressure difference” is found in the flow field. The influence mechanism of “obstruction vortex” and “suction pressure difference” to the heat dissipation and slag discharge is realized, which can be the references to the optimized design of the bit and will lay a foundation for the popularization and application of the technology of gas drainage with screen pipe protection for the whole borehole in soft outburst coal seam.

    Reference
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    [2]候红,凌标灿,罗维等.松软突出煤层中三角形钻杆成孔技术研究[J].煤炭科学技术,2012(8):67-70
    [3]杨明艳.三棱钻杆在松软突出煤层中的应用[J].煤矿机械,2012(5):218-220
    [4]孙新胜,王力,方有向,等.松软煤层筛管护孔瓦斯抽采技术与装备[J].煤炭科学技术,2013(3):74-76
    [5]杨华,谢一伦.气力输送工程[M].北京:机械工业出版社.2006:107- 116
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History
  • Received:August 05,2013
  • Revised:August 06,2013
  • Adopted:August 13,2013
  • Online: October 08,2013
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