基于气固两相流的反循环潜孔钻头柱齿拓扑优化设计

摘要

In order to manage the poor capability to carry cuttings of the traditional reverse circula-tion down-the-hole (DTH) bit ,a new bit is designed .The distance ,size and number of the bit-cylindrical teeth were optimized in the designed bit .Also a new logarithmic-spiral arrangement form for the bit-cylindrical teeth was proposed .Then ,the flow’s situation at the bottom of a tra-ditional and optimized bit was simulated using the commercial fluent software respectively .Final-ly ,the validity of the simulation model was validated by experiment ,which indicated that ,com-pared to the traditional bit ,the air velocity near the optimized one was changed from 16 .5 m/s to 19 .25 m/s ,and the air velocity of the latter became more uniform .Namely ,the ability of the op-timized bit was stronger and more stable to carry cuttings .The proposed optimized bit can meet the demand of practical engineering better .%为了解决现有反循环潜孔钻头排岩屑效率低的问题，利用几何拓扑方法设计了一种新型钻头．该新型钻头在传统钻头基础上优化了钻头齿间距、齿的数量等，并提出了一种对数螺旋线式齿排列方式．然后，利用大型流体商用软件仿真分析了几何优化前后钻头的气流情况，并利用试验验证了仿真模型的有效性．研究发现，优化前、后钻头附近的气流速度从约16.5 m/s提升到约19.25 m/s ，并且气流速度变得更均匀，即优化后钻头的排岩屑能力更强、更平稳．设计的优化钻头可以更好地满足工程实际需求。