CAJ | 학술논문

超临界水冷堆是以超临界水作为冷却剂和慢化剂的第4代核能系统之一，超临界水在拟临界区附近剧烈的物性变化会给通道内的压降特性带来影响。本文分析了超临界条件下重力压降、加速压降和摩擦压降的特点，并对具体的计算方式提供了一些建议和参考：重力压降需考虑沿程的积分效应；基于隐式PKN公式得到了显式PKN公式，用于求解等温流动摩擦系数；采用CFD数值分析工具比较了超临界条件下不同摩擦关系式的异同，发现Kirillov公式与CFD计算结果较为接近。
초림계수랭퇴시이초림계수작위냉각제화만화제적제4대핵능계통지일，초림계수재의림계구부근극렬적물성변화회급통도내적압강특성대래영향。본문분석료초림계조건하중력압강、가속압강화마찰압강적특점，병대구체적계산방식제공료일사건의화삼고：중력압강수고필연정적적분효응；기우은식PKN공식득도료현식PKN공식，용우구해등온류동마찰계수；채용CFD수치분석공구비교료초림계조건하불동마찰관계식적이동，발현Kirillov공식여CFD계산결과교위접근。
Supercritical water-colded reactor (SCWR) is one of the fourth generation nuclear energy systems with the supercritical water as the reactor coolant and moderator .The sharp variation of fluid property near the pseudo-critical point will have influence on the pressure drop characteristics of the flow channel .In this study ,the pressure drops due to gravity , acceleration and friction were investigated under supercritical conditions and some suggestions were provided as reference .The flow path integration effect in gravity pressure drop needed to be accounted for .The explicit PKN formula was obtained based on the implicit PKN form which could be applied into isothermal flow .The comparison of different frictional pressure drop correlations with CFD numerical simulation results was made ,and it is found that the Kirillov correlation is close to CFD calculation results .