本文通过数值方法对三种热边界下管内SCO2的换热特点进行了研究,结果表明,不同于常物性流体,SCO2在三种不同的热边界下局部换热性能有明显差异.研究发现,第一类热边界(恒定壁温)下流体的温升明显快于第二类(恒定热流密度)和第三种热边界条件(与H2O耦合换热),而第二类和第三种热边界条件虽然壁面热流分布有差异,但SCO2的温升过程及沿程的换热系数分布具有一定相似性.以SCO2为工质,在对管壳式换热器管侧进行简化时,与定壁温边界相比,采用定壁热流边界与实际的双流体耦合换热工况更加接近.
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