液控智能转换接头的数值分析及优化设计

Numerical analysis and optimal design of intelligent transformation joint based on hydraulic control

为了验证液控智能转换接头设计的合理性,优化其内部流道结构,利用Pro/E构建了该智能转换接头的三维模型,划分了非结构网格,根据该装置工作原理和特点,采用标准k-ε模型及壁面函数法,确定了控制方程及边界条件,利用有限元分析软件对装置内部的单向阀在4个不同开度下的内部流场进行了数值模拟,分析了4个不同开度下内部流场的速度分布图及湍动能分布图,并搭建了试验台对装置在4个开度下的出口流量及进出口压差进行了测试,通过数值分析及试验数据的对比确定装置水力损失较小的最佳开度.试验结果表明,智能接头基于液压控制原理可以实现采油状态和测试状态的智能转换,满足功能要求;单向阀在50 mm开度下内部流动损失较小且流速较大,内部流动状态最佳.数值分析与试验结果基本吻合,该结果为改进装置内部结构、提升装置采油作业生产效率提供了依据.

In order to validate the design of an intelligent transformation joint based on hydraulic control and optimize the geometry of flow passages in the joint,a three-dimensional model of the joint is constructed in Pro / E and an unstructured grid is generated in the fluid domain. Then the fluid flow governing equations and boundary conditions are chosen according to the device working principle and characteristics. The standard k- ε turbulence model and wall-function are used to simulate the internal flow field in the joint at four openings of the one-way valve. The distributions of velocity and turbulent kinetic energy are obtained and analyzed using CFD software. Moreover,an experimental device is built to measure the outlet flow rate and the pressure difference between the inlet and the outlet at those openings. By a comparison of numerical analysis and experimental validation,the best opening with lower energy consumption is determined. The experimental results show that the intelligent joint based on hydraulic control can realize an intelligent conversion between the oil production status and the tes-ting states,meeting the requirement on function. Besides,the best internal flow condition,in which the hydraulic loss is small and the velocity is high,is achieved at 50 mm opening. The numerical results are consistent with the experimental data. The results provide a basis for improving device internal structure and enhancing oil production efficiency.