涡轮钻具涡轮中的能量损失分析

分析φ240型涡轮钻具的试验效率曲线表明，涡轮中的能量损失主要是水力损失。水力损失包括叶型损失、冲击损失和瑞壁损失等。为了减少和预防各种能量损失，应合理选择涡轮叶栅的相对节距、定转子的径向间隙和轴向间隙：叶栅相对节距（叶栅节距与叶型弦长之比）应为0．65－075；定转子径向间隙应为1mm；轴向间隙应为14－16mm。同时还应使涡轮在最佳工况下工作，并采用先扩张后收缩的叶片通道。铸造涡轮时，应尽量使叶片表面光滑。

Enery loss of turbine of turbodrills

An analysis of the test efficiency curve of φ240 turbodrill shows that the energy loss of the turbine lies mainly in the hydraulic loss, which includes the loss of hlade contour, impact loss and end wall loss. To decrease and eliminate all kinds of energy loss, the relative pitch of the bladings, the radial and axial clearances between the stator and the rotor must be rationally selected And the turbine must work under the best working condition, and the surface of the blades should be as smooth as possible.