CAJ | 학술논문

棒束内超临界水流动传热是超临界水堆堆芯热工水力研究的重要内容，但对其认识还十分有限。本文针对四棒束内超临界水的流动传热现象开展数值模拟，特别分析了定位格架对棒束通道内流动和传热的影响。结果表明，采用SSG湍流模型计算所得到的棒束壁面温度和实验结果吻合良好，定位格架的存在影响下游流体的速度分布，显著提高格架下游的传热特性，交混系数有大幅上升，使得加热棒周向壁面温度分布更加平均，最高温度出现位置发生改变。
봉속내초림계수류동전열시초림계수퇴퇴심열공수력연구적중요내용，단대기인식환십분유한。본문침대사봉속내초림계수적류동전열현상개전수치모의，특별분석료정위격가대봉속통도내류동화전열적영향。결과표명，채용SSG단류모형계산소득도적봉속벽면온도화실험결과문합량호，정위격가적존재영향하유류체적속도분포，현저제고격가하유적전열특성，교혼계수유대폭상승，사득가열봉주향벽면온도분포경가평균，최고온도출현위치발생개변。
T he investigation on the thermal-hydraulic behavior in SCWR fuel bundles is a very significant content of SCWR research . However , there is still a lack of understanding to predict the flow heat transfer behavior of supercritical fluid .In this paper ,the heat transfer behavior of supercritical fluid in 4-rod bundle with spacer was numerically simulated .The effect of grid structure on the flow and heat transfer was discussed particularly .The numerical simulation using the SSG turbulent model gives a reasonable prediction compared with the experimental results .The calculation results show that the spacer significantly changes the velocity profile in the dow nstream ,and enhances turbulent mixing and heat transfer .Consequently ,the rod wall temperature appears more uniform in the circumferential direction and the peak wall temperature spot also shifts .