恒流量控制阀结构优化及流场数值仿真

Numerical Simulation and Optimal Design of Constant Flow Control Valve

针对现有的机械自力式恒流量控制阀阀芯受力-位移曲线在小位移范围非线性变化的问题,影响流量的稳定性。为解决上述问题,对恒流量控制阀阀芯、挡环进行结构改进,并利用二维数值仿真技术对改进之后的流场进行计算,最终得到了阀芯受力-位移曲线呈线性变化的控制阀模型。为了验证二维数值仿真结果的可信性,对包括出口支撑板在内的控制阀全流场进行三维数值仿真计算。结果可知,阀芯和挡环的结构以及支撑板的位置对恒流量控制阀的阀芯受力有一定影响。同时,通过三维流场数值仿真证明,采用二维流场数值仿真即可较好地得到控制阀的流场特性。

Focusing on the nonlinearity of valve core force - displacement curve of existing self - acting constant flow control valve in minor displacement, this paper accomplished the structural modifying of valve core and the baffle ring, and calculated the flow field of the improved control valve by 2D numerical simulation. Finally, a control valve model with linear valve core force - displacement curve was obtained. For the purpose of verifying the results by 2D numerical simulation, the 3D numerical simulating of the whole flow field including outlet frame was completed. The results show that the valve core, the structure of baffle ring and the position of outlet frame make big difference to the force of the valve core. The 3D simulating result proves that the analysis of the optimized control valve flow fields by 2D numerical simulation is feasible.