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国内的涡轮钻具通常采用直叶片涡轮。针对准178 mm高速涡轮钻具,用UG软件建立一种扭曲叶片涡轮,采用和直叶片涡轮相同的型线(Bezier曲线)。通过数值模拟方法对比了扭曲叶片涡轮和直叶片涡轮的水力性能,并对扭曲叶片涡轮的内流场进行了分析。同时通过台架实验得出了涡轮的水力性能,并验证了CFD数值模拟结果的正确性。扭曲叶片涡轮和具有相同型线的直叶片涡轮相比,输出扭矩基本不变,最优工况点压耗降低了12.5%,水力效率提高了11.7%。扭曲叶片涡轮的水力性能更优,工况适应能力更强,对涡轮钻具综合性能的提升提供了一种途径。
Domestic turbine drill is usually used straight blade turbine. For the quasi-178 mm high-speed turbine drill, a twisted-blade turbine was built with UG software using the same profile (Bezier curve) as a straight-bladed turbine. The hydraulic performance of twisted blade turbine and straight blade turbine is compared by numerical simulation method and the internal flow field of twisted blade turbine is analyzed. At the same time, the hydraulic performance of the turbine was obtained through bench test, and the correctness of the CFD numerical simulation results was verified. Compared with straight vane turbine with the same profile, the twisted vane turbine has the same output torque, the optimal working point pressure loss is reduced by 12.5% and the hydraulic efficiency is increased by 11.7%. Turbofan turbine blades have better hydraulic performance and stronger adaptability to working conditions, providing a way to improve the overall performance of turbine drilling tools.