CFD simulation of diamond bit's bottomhole flow field
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摘要: 运用计算流体力学(computational fluid dynamics,CFD)理论,采用RNG k-ε模型及连续性方程对常规ϕ75/ϕ49 mm钻头的井底流场进行了数值模拟,分析了井底压力、流速、剪力分布特征及水口涡流对唇面流场的影响,针对钻齿的冷却不充分部位及冲蚀严重部位提出了金刚石匹配优化设计建议。模拟结果表明:常规ϕ75/ϕ49 mm钻头模型唇面压力分布梯度是由内沿指向外沿逐级递减的,由于水口涡流的存在,其介质流速云图、剪力等高云图呈扭曲"凸"形分布。Abstract: Based on the theory of computational fluid dynamics(CFD),the bottomhole flow field of the ϕ75/ϕ49 mm diamond bits is simulated using the RNG k-ε model.Meanwhile,the effects of bottomhole pressure,flow velocity,shear strain and the eddy of water gap on the crown surface are analyzed.The diamond arrangement is optimized in the insufficient cooling location and serious erosion area.The simulation results show that the pressure distribution gradient on the ϕ75/ϕ49 mm diamond bit's crown surface declines from the inner edge to the outside edge.Because of the eddies in the water gap,the medium flow nephogram and the shear force vector nephogram show a distorted convex form.
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