Optimization design for turbodrill blades based on a twisting method
Yuguang He, Yu Wang, Delong Zhang, Yuxiang Xu
Abstract
Turbodrills are essential tools used for deep drilling at high temperatures, but have the drawbacks of high rotation speed and low torque. The stator and rotor blades are the most critical hydraulic parts in turbodrill structures, as the blade profiles determine the efficiency of the turbodrill. A methodology for enhancing the output performance of a turbine blade is proposed. First, a quasi-three-dimensional method is proposed to design the blade, which considers that the tangential scale of the blade is proportional to the radius while the axial scale remains the same. Second, a mathematical model for calculating the torque of the blade is established. Furthermore, different blades are built by adjusting the three-dimensional parameter of the presented method. Finally, a numerical simulation of the blades is carried out using Computational Fluid Dynamics (CFD). The results show that the blades designed by the method can effectively improve the output torque. Taking a Φ178 turbodrill as an example, the blade designed by the methodology proposed in this work increases the torque by 31.4%. The methodology can improve the hydraulic performance and provide theoretical guidance for the design of turbodrill blades.