ACME台架蒸汽发生器传热特性数值模拟

以ACME台架的蒸汽发生器（SG）为研究对象，SG二次侧选用两流体模型，采用计算流体力学软件CFX对ACME台架的SG进行了整体直接模拟。针对稳定试验工况进行了计算，得到了SG一、二次侧的温度分布，二次侧空泡份额分布及传热管的壁温等参数沿U型管高度方向的变化，获得了二次侧较详细的流动和传热特性。计算结果表明，从第2道折流板开始，折流板底部已积聚了部分气泡，随高度的增加，折流板底部积聚的气泡越多，在弯管区附近及以上区域，已全部变为蒸汽。本文计算结果与试验结果符合较好。

Numerical Simulation on Heat Transfer Characteristic of Steam Generator of ACME Facility

Taking the steam generator (SG) of the ACME facility as the study object, two-fluid model was chosen for the secondary side of the SG and a direct simulation was made on the whole SG of the ACME facility with the CFD software CFX. The stable test conditions were calculated. The primary side and secondary side temperature distribution of SG, the secondary side void fraction distribution and the wall temperature of heat transfer tube were obtained. The secondary side detailed flow and heat transfer characteristics were arrived. The results show that bubbles begin to accumulate from the second baffle and bubble amount increases as the tube is higher. Near the bend area and above, they all become steam. The calculated results are all in accordance with the experimental results.