垂直管内含不可凝气体蒸汽的冷凝换热MELCOR数值模拟

Simulation of Steam Condensation Inside Vertical Tube with Noncondensable Gases Using MELCOR

采用MELCOR程序建模,对垂直管内含有空气的冷凝传热过程进行模拟计算,并将数值模拟结果与Kuhn的实验进行比较。结果表明,MELCOR模拟结果基本与实验结果基本吻合,验证了MELCOR模型的合理性。但是,MELCOR模拟蒸汽传质和液膜累积过程偏大,使得总换热系数偏大。通过对MELCOR模型参数进行修正,调整后计算得到的液膜厚度和换热系数比调整前减小,且结果与实验吻合得很好。

Using MELCOR, the numerical simulation of steam condensation inside vertical tube in the presence of noncondensable gases is carried out. Calculated results are compared with Kuhn＇s experimental results. Generally the agreement is satisfactory except that the heat transfer process and condensed film accumulation were overestimated, leading to the larger heat transfer coefficient. After modification of parameters of MELCOR model, the thickness of film and the overall heat transfer coefficient were decreased and agreed well with experiment data. Thus the MELCOR model is valid.