钻井液连续波信号发生器转阀水力转矩分析

转子运动过程中在转子背面产生的回流以及随转子的转动而不断变化的入口速度角导致了转阀的水力转矩变化较大,影响了转阀的动态性能.利用动量矩定理建立转阀水力转矩的理论模型,然后利用CFD方法,针对所设计的实验样机进行三维流场仿真,对转阀水力转矩的几种影响因素进行仿真分析.研究结果表明:在转阀关闭的起始阶段,水力转矩使转阀趋于打开,其余阶段,水力转矩使转阀趋于关闭;采用曲线阀VI可以使水力转矩变化平缓;适当增大定转子轴向间隙、增加转阀阀瓣个数、减小转子阀瓣厚度可以减小水力转矩,改善电机的控制性能.

Analysis on rotary valve hydraulic torque of drilling fluid continuous wave signal generator

The backflow occurred behind the rotor blades when the rotor rotated and the inlet velocity angle of the rotor varied with rotor's motion,which lead to the great change of the hydraulic torque on the rotary valve, and the dynamic performance of the rotary valve was influenced. A theoretical calculation model of the hydraulic torque on the rotary valve was established based on the theorem of momentum moment, and then the three-dimensional flow field inside the experimental prototype was simulated by CFD method, and the simulation analysis of several influence factors of the hydraulic torque on the rotary valve was made. The results show that the hydraulic torque on the rotary valve tends to open the rotary valve in the starting stage of the closure, and tends to close the rotary valve in other stages. The hydraulic torque can be changed mildly using the curved orifice, and the hydraulic torque can be decreased and the control performance of the motor can be improved by increasing the gap between the stator and rotor or increasing the number of the valve lobe or decreasing the thickness of the valve lobe.