CAJ | 학술논문

超临界水冷堆（SCWR）开发的关键是棒束内超临界水（SCW ）的热工水力特性。本文针对超临界水四棒束流动传热实验进行CFD数值模拟，SSG湍流模型的计算结果与实验结果吻合良好。分析结果表明，流动方向对棒束截面内流量分布有显著影响。与下降流相比，尽管上升流时棒束间流动搅混较弱，但上升流时棒束截面流量及壁面周向温度分布更加均匀，加热棒壁面温度更低。可见，棒束横截面上的流量分布是影响加热棒壁面流动传热的主要因素。
초림계수랭퇴（SCWR）개발적관건시봉속내초림계수（SCW ）적열공수력특성。본문침대초림계수사봉속류동전열실험진행CFD수치모의，SSG단류모형적계산결과여실험결과문합량호。분석결과표명，류동방향대봉속절면내류량분포유현저영향。여하강류상비，진관상승류시봉속간류동교혼교약，단상승류시봉속절면류량급벽면주향온도분포경가균균，가열봉벽면온도경저。가견，봉속횡절면상적류량분포시영향가열봉벽면류동전열적주요인소。
A key issue of SCWR development is the thermal hydraulic characteristics of supercritical water (SCW) flowing in rod bundles .The heat transfer of SCW in a 4‐rod bundle was numerically simulated by CFD in this study .The SSG turbulent model was selected and a reasonable prediction was achieved comparing with the experimental data . The simulated results show that the flow direction has great impact on the flow rate dis‐tribution at cross section .Comparing with the downward flow ,the upward flow has more uniform flow rate distribution and circumferential temperature distribution w hich results in lower wall temperature ,though its flow mixing in the bundle is relatively weak .It indicates that the convective heat transfer on heating wall is mainly influenced by flow rate distribution in the cross‐sectional flow area of bundles .