波纹管对气体离心机流场影响的数值研究  

Numerical Study of Bellow Effect on the Flow Field of a Gas Centrifuge

作　　者：安明 路昕 曾实[1] AN Ming;LU Xin;ZENG Shi(Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Research Institute of Physical and Chemical Engineering of Nuclear Industry,Tianjin 300180,China)

机构地区：[1]清华大学工程物理系,北京100084 [2]核工业理化工程研究院,天津300180

出　　处：《同位素》2022年第1期61-66,共6页Journal of Isotopes

基　　金：国家自然科学基金资助项目(No.11575097,No.11911530087)。

摘　　要：波纹管是超临界气体离心机的核心部件,可改变转子流场的空间结构。为了研究波纹管对气体离心机流场的影响,在单向关联水力学模型和Iguassu离心机模型基础上,在交错网格上离散二维N-S方程组,并使用同伦算法和牛顿迭代法求解,对包含内、外波纹管的流场分别进行数值模拟。结果表明,外波纹管对环流几乎没有影响,但在不改变贫取料压强的情况下,为避免UF_(6)气体发生冷凝,其允许径向凹陷深度很小。而内波纹管会对环流产生阻碍作用,导致分离性能下降,其径向凸起高度是影响分离性能的主要因素;在贫取料压强一定的情况下,径向凸起高度越大,分流比越低,分离性能越低。在设计含内波纹管的超临界气体离心机的过程中,应选择合适的内波纹管径向凸起高度,既要尽量减少分离功率的损失,又要保证能够在安全工况下达到合适的分流比。Bellow is key component of a supercritical gas centrifuge,which has changed the construction of the rotor’s wall and impacted the flow field inside the rotor.In order to analyze the impact of the bellow on the flow field in a gas centrifuge,numerical simulations have been carried out for flow fields with an inner bellow and an outer bellow respectively.The simulations of the flow field are based on the uni-connected hydraulic model and the Iguassu centrifuge model,and 2-D N-S equations are criticized and solved on the staggered grid by a homotopic method and the Newton iteration method.The simulation results show that the outer bellow has almost no effect on circulation flow,but allowable radial height of the outer bellow is very small in order to avoid the possible condensation of the UF_(6) gas when keeping the waste withdrawal pressure constant.In addition,the inner bellow blocks circulation flow and results in the decrease of the separative power.According to the pareto analysis,the radial height of the inner bellow is the major impacting factor.Another result shows that,when the waste withdrawal pressure is constant,the radial height of the inner bellow is larger,the cut and the separative power is lower.In conclusion,during the design process of a supercritical gas centrifuge with inner bellows,it is necessary to properly design the radial height of the inner bellow to both lower the loss of separative power and ensure an achievable proper cut under safe working conditions.

关 键 词：波纹管 气体离心机 流场 数值模拟 分流比 

分 类 号：TL252[核科学技术—核燃料循环与材料]