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运用计算流体力学(computational fluid dynamics,CFD)理论,采用RNGk–ε模型及连续性方程对常规75/49mm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75/49mm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。
The bottom hole flow field of a conventional 75 / 49mm drill is numerically simulated by using computational fluid dynamics (CFD) theory, RNGk-ε model and continuity equation. The effects of bottom hole pressure, flow velocity, shear force Distribution characteristics and the influence of nozzle vortex on the flow field of the lip surface, aiming at the insufficient cooling of the drilling teeth and the severe erosion site, a diamond optimization design proposal is proposed. The simulation results show that the gradient of the lip pressure distribution in the conventional 75 / 49mm drill bit model decreases step by step from the inner edge to the outer edge. Due to the vortex flow in the outlet, the velocities of “ ”Shape distribution.