随钻测井用涡轮发电机叶轮组水力性能分析

Hydraulic Performance Analysis of Turbine Impeller Assembly for LWD

采用CFD方法对某型随钻井下涡轮发电机叶轮组进行数值分析,计算叶片的水力特性,预测叶轮的输出性能。首先,提取叶轮模型的几何特征参数,采用CFD分析软件FINE/Turbo建立仿真模型,并对叶轮组进行全三维数值仿真模拟,得出静子叶片出口流动角和转子叶片进口流动角沿径向分布规律,以及转子叶片压力系数沿径向分布等水力特性参数。然后通过计算得到叶轮的输出功率、输出扭矩和效率等宏观特性参数,并解释了叶轮输出特性与叶片水力特性之间的关系。最后通过试验验证数值仿真叶轮的转速误差在6%以内。研究结果可为叶片改型和叶轮输出性能的改进提供参考。

To gain the hydraulic characteristics of the blades and predict the output performance of the impel- ler, numerical analysis was conducted on a set of impellers of a turbine generator used for LWD by using CFD method. The geometric parameters of the impeller model are obtained to establish the simulation model by CFD anal- ysis software FINE / Turbo. Then, a full three-dimensional numerical simulation of the impeller group is carried out. Hydraulic characteristics parameters like the distribution of outlet flow angle of stator and rotor along the radial direction, and the pressure coefficient distribution of each section of rotor blade are obtained. The macroscopic pa- rameters like impeller output power, output torque and efficiency are calculated. The relationship between the out- put characteristics of the impeller and the hydraulic characteristics of the blades is explained. Finally, a comparison test is made and the result shows that the numerically simulated impeller speed has an error of less than 6%. The research results could provide reasonable suggestions for the impeller blade modification and output performance im- provement, and has explored a numerical method to accurately simulate downhole mud impeller hydraulic perform- ance.