Study on Flow field of the Large Via Open-closed Bit Based on CFD
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摘要: 采用计算流体力学方法对大通孔开闭式钻头[1]的流场进行数值模拟。对不同工况下的速度场进行分析,获得了最佳钻进风量,并发现流场中存在“阻塞漩涡”。对最佳流量工况下的压力场进行分析,发现流场中还存在“抽吸压差”。获得了“阻塞漩涡”和“抽吸压差”对排渣和散热的影响机理,为钻头的优化设计提供了一些参考依据,为松软突出煤层全孔筛管护孔瓦斯抽采技术在煤矿中推广应用奠定了基础。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 op-timum 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.
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