模糊贴近度方法在超临界水堆换热关系式选择中应用

摘要

以超临界水堆换热关系式为基础,利用模糊数学中贴近度的概念,并引入变异系数法确定各影响因素的权重.比较了确定工况与各经验公式适用范围的贴近程度,获得了该工况下最为适用的经验关系式.结果表明,采用Hamming贴近度、Euclid贴近度及最大最小贴近度等三种方法的计算结果基本一致,模糊数学中贴近度的应用,为超临界水堆的流动换热问题提供了一种可以在已知关系式的基础上,做出针对特定工况的最优关联式选择方法,使计算结果更加精确.%Background: Supercritical water-cooled reactor (SCWR) is the only water-cooled reactor among the fourth generation reactors. And its thermal hydraulic process is the key to the study of SCWR, which is directly related to the safety and economy of the reactor. Purpose: The degree of closeness between the determined working condition and the applicable range of empirical formula is compared to get the most suitable empirical relation. Methods: Based on the concept of closeness degree in fuzzy mathematics, the coefficient of variation method is used to determine the weight of each factor. Results: The calculation results by Hamming closeness degree, Euclid closeness degree and maximum minimum closeness degree are basically the same. Conclusion: For the problem of flow and heat transfer of supercritical water reactor, a kind of optimal correlation selection method is proposed based on the known correlation.