钠冷快堆蒸发器流致振动试验件可行性分析

Feasibility analysis of the fluid-induced vibration experimental prototype for evaporator components of sodium-cooled fast reactor

钠冷快中子反应堆使用的钠水蒸汽发生器采用直管管壳式换热器结构,包括蒸发器和过热器2个组件。在蒸发器组件中,液态金属钠流经壳侧,并与管侧流动的水进行逆向换热。管侧流动的给水被加热为过热蒸汽过程中,经历沸腾与传热等过程,如果蒸发器组件结构设计不当,极易发生管束流致振动并诱发换热管疲劳破损,引起严重钠水反应,影响设备安全和反应堆正常运行。本文对钠水蒸汽发生器中蒸发器组件管束流致振动试验件进行可行性分析论证:采用相似分析方法分析与试验件设计相关的相似准则,初步确定试验件缩尺比例以及试验介质参数;基于相似分析将试验件与蒸发器组件原型样机对比,确定简化的模拟试验件基本结构形式;建立蒸发器试验件简化CFD模型,模拟分析其流场特性和换热管模态特性;论证10组简支的简化蒸发器组件流致振动试验件的可行性,为后续开展流致振动试验奠定基础。

The steam generator of sodium-cooled fast reactor(SFR)was designed by straight tube structure.It was consisted of evaporator and superheater components.For the steam generator,the coolant liquid metal sodium flowed through the shell-side,and the water/steam was located at tube-side.When water was heated to superheated steam,it inevitably experienced boiling and heat transfer deterioration process.Two-phase flow instability phenomenon was occurred in tube-side of steam generator,and this easily caused series of operational and safe issues if the components were poorly designed.The feasibility analysis of the evaporator component fluid-induced vibration experimental prototype was focused on.The main conclusions were as follows:The important similarity criterions related to experimental prototype design were deduced by similarity analysis method;A basic simplified structure of experimental prototype was designed by comparing with the prototype components;Flow field characteristic and modal characteristics were simulated by constructing a CFD model,and the feasibility of fluid-induced vibration experimental prototype was furtherly demonstrated;The feasibilities of ten groups of components were proved,adn it provided the theoretical basis for subsequent superheater experimental prototype design.