基于CFX的调节阀空化数值模拟及结构优化

Numerical Simulation of Cavitation and Structure Optimization of a Control Valve Based on CFX

为减少某核电站调节阀最高运行参数工况下的空化损伤,基于CFX软件采用多相流模型和空化模型对结构优化前后的调节阀的空化情况进行数值模拟,分析了阀门内部不同结构对空化区域分布和空化程度的影响。结果表明:作为关键部位的阀芯密封线处易受空化损伤;优化后的阀门结构可以使阀芯密封线处的空化发生一定的转移,有效降低了阀芯密封线附近的空化率,保护了阀芯密封线的完整性。

In order to reduce the cavitation damage of a control valve in a nuclear power plant under maximum operating condition,multiphase flow model and cavitation model were used to simulate the cavitation of the control valve before and after optimization based on CFX software.And the influence of different structures in the control valve on cavitation distribution and degree was analyzed.Results show that the sealing line of the control valve spool,as the key part,is vulnerable to be damaged by cavitation.Part of cavitation near the sealing line of the control valve spool can be transferred by the optimized structure,and thus the degree of cavitation near the sealing line is reduced effectively,which is helpful to protect the integrity of the sealing line.