To address the problem of erosion around the ball seat in the control sub of drilling reamer,the flow field around the ball seat is simulated using Fluent software to optimize the flow pass structure.The simulation results show that,before ball drop,the erosion mainly occurs at the contraction of the ball seat.The optimized parameters are:inlet diameter of 60 mm,axial height of 46 mm and flow pass convergence angle of 80°.For after ball drop,optimized parameters using simulation are r1 =49 mm,r2 =62 mm,β=45°,and h =13 mm.The optimized ball seat and the ball seat outer sliding sleeve can effectively reduce the erosion of the fluid on the ball seat and the inner wall of the ball seat outer sliding sleeve with smooth flow field.The study results could provide a new engineering optimization idea for the flow channel structure design.%为解决随钻扩眼器控制短节中球座的周边冲蚀问题,采用Fluent软件对随钻扩眼器控制短节中球座周边流场进行仿真,并优化流道结构.仿真结果表明:未投球状态下,冲蚀影响较大位置出现在球座收缩处,优化后的参数为流道入口直径60 mm、轴向高度46 mm、收敛角度80°:已投球状态下,对冲蚀会影响控制短节再次使用的流道结构进行模拟和优化,结果为流道入口半径r1=49 mm,球座上端外部新流道环形空间部分的外径r2=62 mm,β=45°,流道轴向高度h=13 mm.采用优化后的球座结构以及球座外滑套结构,能够有效减小流体对球座和球座外滑套内壁的冲蚀,平缓流场.研究结果可为工程上流道结构设计提供一种新的优化思路.
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