整体试验台架非能动换热器的比例模化及设计

Scaling analysis and design of passive heat exchanger in integral effect test facility

针对整体试验台架中非能动换热器(PHX)的缩比设计问题,本文对不同核电堆型、不同事故中PHX的工作特点进行了分析。通过建立PHX控制方程并进行模化分析,获得了PHX模拟体与原型PHX之间应满足的通用相似准则,确定了缩比PHX参数设计应满足的比例关系,并以ACME台架为例进行了缩比PHX的模化设计和失真评估。结果表明:通流面积比和热源数是整体台架PHX设计应遵循的主要相似准则,浮升数和阻力数主要通过PHX系统回路阻力调节来满足;根据通流面积比和热源数相似准则设计的PHX可以满足整体台架对破口和非破口等不同类型事故的模拟要求,且具有较小的比例失真。

Considering the problem of scaling down design of passive heat exchangers(PHXs)in an integral effect test facility(IETF),this study analyzed the performance characteristics of different PHXs for different nuclear power plants.The general similarity criteria that should be preserved equal among PHXs in the test facility and prototype were obtained from non-dimensionalized equations by establishing the governing equations for PHXs and performing scaling analysis.The scaling relationships that should be satisfied in the parameter design of scaled PHX were finally determined.Taking the ACME test facility as an example,the design of the scaled PHX was conducted,and the distortions were evaluated.The flow area ratio and heat source number are the dominant similarity criteria for the design of scaled PHXs in IETFs.The Richardson number and friction number could be satisfied by adjusting the loop resistance of the test facility.The scaled PHX,designed according to flow area ratio and heat source number,can satisfy the demands for simulating different accidents,such as loss of coolant accidents(LOCAs)or non-LOCAs of the integrated facilities,and has relatively small distortions.