蒸汽发生器二次侧三维两相流场稳态计算

Three-Dimensional Steady Calculation on Two-Phase Flow in Secondary Side of Steam Generator

采用多孔介质模型对蒸汽发生器二次侧流场进行分析。通过在多孔介质模型控制方程中添加附加的动量源项和能量源项来模拟蒸汽发生器内构件影响，动量源项中考虑下降段、管束、支承板和汽．水分离器的阻力；能量源项中添加一次侧对二次侧的释热。将控制方程在ANSYSFLUENT求解器中求解，得到蒸汽发生器二次侧区域的速度场、温度场、压力场、密度场和含气率分布。结果表明，蒸汽发生器内冷热侧流速、空泡份额、混合物密度相差很大；汽．水分离器进口空泡份额分布在0．63-43．98之间；压力在轴向逐渐降低，在支承板位置出现突降。

Secondary side two-phase flow in steam generator was simulated based on the porous media model. Additional momentum and energy source terms were appended to the momentum and energy equations of porous media region, respectively. The additional momentum source contained the resistances of downcomer, tube bundle, support plate and separator. The additional energy source included the heat transfer from primary side to secondary side fluid. Solving the control equations by ANSYS FLUENT solvers yielded the distributions of velocity, temperature, pressure, density and quality. The distributions of velocity, void fraction and mixture density in hot side vary significantly from these in cold side; the void fraction at the inlet of separator differs from 0.63 to 0.98; pressure descends along axial direction, while at the positions of support plates, pressure declines sharply.