光滑方环管内超临界水流动与传热特性数值计算研究

CFD Analysis of Flow and Heat Transfer Behavior of Supercritical Water in Square Annular Channel

采用CFD数值模拟方法对光滑方环管内超临界水流动与传热特性进行初步研究。计算结果表明,光滑方环管内超临界水的传热特性存在强烈的周向不均匀性,角通道处的传热状况较窄通道处的好,角通道处的加热壁面温度低于同一截面上窄通道处的加热壁面温度。周向传热不均匀因子随主流焓的增加而增加,在拟临界点附近增长的速度最快。造成方环管内超临界水传热周向非均匀的原因主要是流道的形状。超临界水冷堆中,窄通道处最易出现传热恶化,在堆芯设计中需给予更多关注。

The primary numerical simulation was presented on heat transfer behavior of supercritical water in smooth square annular channel.The simulation results indicate that the heat transfer behavior of supercritical water in smooth square channel is greatly non-uniformity in circumference.The heat transfer of the corner channel is better than that of the narrow channel.The heated wall temperature of the corner channel is lower than the heated wall temperature of the narrow channel at the same cross section.However,this circumferential non-uniformity increases along the axial distance,which increases most rapidly near the pseudo-critical point.It could be concluded that the main reason for the non-uniformity of heat transfer in circumference is the channel shape.It is important to pay more attention to the narrow channel of the SCWR when designing the core.