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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ANSYS FLUENT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0.63~0.98之间;压力在轴向逐渐降低,在支承板位置出现突降。
The porous medium model was used to analyze the secondary flow field of the steam generator. The influence of the components in the steam generator is simulated by adding additional momentum source and energy source terms to the governing equations of the porous media model, taking into account the resistance of the descending section, the tube bundle, the support plate and the steam-water separator, the energy source Add a side to the secondary side of the heat release. The governing equations are solved in the ANSYS FLUENT solver, and the velocity field, temperature field, pressure field, density field and gas content distribution in the secondary side of the steam generator are obtained. The results show that the flow rate of hot and cold side, the volume fraction of foam and the density of mixture are quite different in the steam generator. The content of the bubble in the inlet of steam-water separator is distributed between 0.63 and 0.98. The pressure decreases gradually in the axial direction. Suddenly dropped.