Research on Multi-Scale Coupling Simulation of Natural Circulation System With 3x3 Petal-Shaped Fuel Rod Assembly
Petal-shaped rod assembly has attracted extensive attention at home and abroad due to its excellent heat transfer performance.In order to obtain flow characteristics of petal-shaped rod as-sembly under natural circulation flow conditions,multi-scale coupling simulations were carried out on a natural circulation system with 3x3 petal-shaped rod assembly.Firstly,based on one-dimensional user program and STAR-CCM+,a one-dimensional and three-dimensional coupled numerical model of natural circulation system was constructed,and the model was verified by combining experimen-tal results.Then,the effects of heating power and height difference on natural circulation capacity and resistance coefficient of the petal-shaped rod assembly were analyzed emphatically.The results showed that the systemic exhaust power and the height difference between the cold and heat sources satisfies a power function distribution.By introducing a viscosity correction factor and a structural influence factor,a general expression form for the resistance coefficient of petal shaped fuel assembly under wide Re number ranges,different pitches,heating,and cold conditions was obtained.Its reliability was verified based on simulation and open experimental data.
natural circulation systempetal-shaped rod assemblynatural circulation capacitymulti-scale coupling simulationresistance coefficient
NETL
NSTL
万方数据
维普
