基于气固两相流的反循环潜孔钻头柱齿拓扑优化设计

The cylindrical teeth's topology optimization design of reverse circulation DTH bit based on gas-solid two-phase flow

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16.5m/s提升到约19.25m/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.

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 .