摘要
射频四极场(Radio Frequency Quadrupole,RFQ)加速器在大功率运行时会导致温度升高和热变形。针对其热稳定性的研究,在很多的多物理分析方法中,研究者将模型局限于二维RFQ截面或三维RFQ局部结构,忽略了冷却流体的流动运动。本文提出了一种结合计算流体动力学(Computational Fluid Dynamics,CFD)热流耦合的三维多物理场数值分析方法,包括电磁-流体-热-结构的多物理场耦合分析。基于实验工况,分析了3种(Standard、RNG、Realizable)k-ε湍流模型在同样工况下的换热效果,通过仿真结果与实验结果比较,验证方法的可行性和可靠性。选择合适的湍流模型,分析不同参数下腔体温度、结构和频率的变化规律。结果表明:应用CFD数值模拟方法可以较好的模拟RFQ加速器稳态传热状态,为未来加速器的结构优化、性能改进提供有效的数值模拟平台。
[Background] Radio frequency quadrupole(RFQ) field accelerator causes temperature rise and thermal deformation during high power operation. Among many multi-physical analysis methods for RFQ cavity, these models are limited to 2 D RFQ section or 3 D RFQ local structures whilst the fluid flow motion was ignored.[Purpose] This study aims to propose a noval three-dimensional multi physical field numerical method for coupling analysis of RFQ cavity. [Methods] Combined with computational fluid dynamics(CFD) and heat flow coupling,electromagnetic, fluid, thermal, structure were integrated into electromagnetic multi physical field coupling analysis.A 81.25 MHz RFQ cavity was taken as sample for verification and the heat transfer effects of three(Standard, RNG,Realizable) k-ε turbulence models under the same experimental conditions were analyzed. [Results &Conclusions] The results show that the CFD numerical simulation method can better simulate the steady-state heat transfer of RFQ accelerator. The feasibility and reliability of the method were verified by comparison with the experimental results. The variation of cavity temperature, structure and frequency under different parameters were analyzed using a suitable turbulence model. Hence this study provides an effective numerical simulation platform for the structural optimization and performance improvement of the accelerators in future.
作者
赵博
张斌
陈叔平
王锋锋
朱铁明
金晓凤
ZHAO Bo;ZHANG Bin;CHEN Shuping;WANG Fengfeng;ZHU Tieming;JIN Xiaofeng(Institute of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《核技术》
CAS
CSCD
北大核心
2020年第3期7-12,共6页
Nuclear Techniques
基金
国家自然科学基金(No.11427904)资助~~
关键词
计算流体力学
加速器
耦合
数值模拟
Computational fluid dynamics
Accelerator
Coupled
Numerical simulation
