基于大涡模拟(LES)的格架外条带区域压力和速度瞬态特性研究

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LES Calculations for Pressure and Velocity Transient Characteristics on Spacer Grids Outer Ribbons

Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610041

摘要: 分别运用雷诺平均模拟(RANS)方法和大涡模拟(LES)方法对燃料组件格架外条带区域的流场和压力场进行瞬态求解。分析发现:采用2种方法所计算出的速度分布大体一致,但是RANS方法不能捕捉到速度和压力的瞬态变化特性,而LES方法能够有效观察到流场的瞬态特性。通过2种方法的对比,可发现部分局部区域计算结果有较大差异。LES计算结果呈现出计算域内明显的压力波动,频谱分析发现格架不同区域具有不同的压力波动特性。
- 大涡模拟(LES) /
- 压力和速度 /
- 瞬态特性
Abstract: Pressure and velocity transient characteristics was analyzed by CFD based on RANS and LES.Both calculations showed the macroscopical results were similar with each other.The transient characteristics can not be obtained by RANS calculations,while LES calculations could show transient pressure and velocities effectively.Different results could be found in detail between RANS and LES.LES calculations also gave the pressure fluctuations.Frequency spectrum analyzing showed that in different area the pressure fluctuations characteristics were different,which could be used for mechanics design.
- LES /
- Pressure and velocity /
- Transient characteristics