中文摘要：

针对船舶某流体管路系统中的控制球阀在工作过程中易产生涡流、液击等现象,应用FLUENT动网格技术和UDF技术,采用RNGk-ε湍流模型封闭的雷诺平均N-S方程组,对球阀流场进行了CFD动态数值模拟,并与实验流量进行了对比分析,验证了该仿真模型的有效性。在此基础上,分析研究了球阀不同启闭规律、阀腔大小等因素对球阀流场动态特性的影响,为球阀在结构和控制上进行减振降噪的优化提供了理论依据。

英文摘要：

The ship piping controlled by ball valve is liable to generate vortex and liquid hammer when it is working.Aimed at this problem,a 3-D flow field of ball valve is numerically simulated with Reynolds average N-S equations closed by RNG turbulence model and by means of technology of dynamic mesh and UDF of FLUENT.And the validity of the model is proved by comparing and analyzing the flow rate from the simulation with that from the experiments.On this basis,the flow field′s dynamic characteristics are analyzed under the conditions of different on-and-off rules and different sizes of cavity,which will provide a theoretical reference for vibration-noise reduction in the structure and control of ball valve.