CAJ | 학술논문

基于两流体欧拉数学模型结合RPI壁面沸腾模型，利用大型商用CFD软件ANSYS CFX 12.0对蒸汽发生器传热管束过冷沸腾区一次侧、壁面和二次侧耦合传热过程进行了数值模拟。研究了三叶梅花孔支撑板和不同入口过冷度条件下蒸汽发生器传热管束内的流动沸腾现象，得到一、二次侧流场与温度场，二次侧空泡份额分布，支撑板梅花孔局部的流动状况及不同入口过冷度对蒸汽发生器热工水力特性的影响。数值模拟结果表明，三叶梅花孔支撑板的存在及不同入口过冷度对蒸汽发生器传热管束过冷沸腾区域的热工水力特性影响显著。
기우량류체구랍수학모형결합RPI벽면비등모형，이용대형상용CFD연건ANSYS CFX 12.0대증기발생기전열관속과랭비등구일차측、벽면화이차측우합전열과정진행료수치모의。연구료삼협매화공지탱판화불동입구과랭도조건하증기발생기전열관속내적류동비등현상，득도일、이차측류장여온도장，이차측공포빈액분포，지탱판매화공국부적류동상황급불동입구과랭도대증기발생기열공수력특성적영향。수치모의결과표명，삼협매화공지탱판적존재급불동입구과랭도대증기발생기전열관속과랭비등구역적열공수력특성영향현저。
Based on two fluid Euler model combining with RPI wall boiling model ,the coupled heat transfer among the primary side ,the tube wall and the secondary side in the subcooled boiling region of the heat transfer tube bundle of steam generator (SG) was simulated by using ANSYS CFX 12.0 code .The flow boiling phenomenon occurred in the heat transfer tube bundle of SG under trefoil orifice plate and different inlet subcooling conditions was researched . The velocity and temperature distributions of both the primary and the secondary sides ,the void fraction distribution of the secondary side ,the local flow characteristics around trefoil orifice plate ,and the effect of different inlet subcoolings on thermal-hydraulic characteristics of SG were acquired .Numerical simulated results show that the existence of trefoil orifice plate and inlet subcooling have a significant influence on thermal-hydraulic characteristics in the subcooled boiling region of the tube bundle of SG .