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本文应用考虑浮升力的湍流标准Ｋ－ε模型和Ｐｒｔ经验修正式，对液钠空腔内非稳态热分层流动进行了全隐式数值计算，比较研究了一阶迎风、乘方（ＰＬＤＳ）、ＭＰＬ（ＶａｎＬｅｅｒ＇ｓ格式），二阶迎风（ＳＯＵＤＳ）、ＭＳＯＵ（单调二阶迎风）、ＯＵＩＣＫ，ＳＨＡＲＰ和三阶ＱＵＩＣＫ格式，数值计算以ＳＩＭＰＬＥＣ算法为基础．通过与实验的比较分析，结果表明：对液钠空腔内伴有热分层的回流流动的全隐式数值计算应采用高阶单调格式或ＱＵＩＣＫ系列格式，低阶格式无法预言其热分层现象；本文建议选用三阶ＱＵＩＣＫ格式．
In this paper, the implicit turbulence standard K-ε model and the Prt empirical modified formula are used to calculate the implicit non-steady-state thermal stratified flow in a liquid-liquid sodium cavity. The first order windward, ), MPL (VanLeer’s format), second order upwind (SOUDS), MSOU (monotonic second order upwind), OUICK, SHARP and third order QUICK formats. Numerical calculations are based on the SIMPLEC algorithm. The results show that the full implicit numerical calculation of the backflow flow with thermal stratification in the liquid sodium-sodium cavity should adopt the high-order monotone format or the QUICK series format. The low-order format can not predict the thermal stratification Phenomenon; This paper recommends the use of third-order QUICK format.