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中文摘要：
采用两相非等温模型，分别针对具有27条流道的全电池和典型单元的稳态工作过程进行了三维数值模拟，并着重对比和分析了2种模型液态水饱和度、相变源项和温度的计算结果。发现在相同计算工况和计算条件下，目前文献中广为采用典型单元模型和伞电池模型的模拟结果无论是变化趋势还是变化幅度均存在很大差异，如典型单元模型中液态水饱和度远低于全电池模型的情形。这些差别丰要是由于两种模型边界条件的设置所引起的。因此即使在相同的计算条件下目前文献中广为采用的典型单元模型和全电池模型所模拟出的PEMFC过程并不是同一过程。
英文摘要：
Three-dimensional numerical simulations of a typical unit （TU） of Polymer Electrolyte Membrane Fuel Cell （PEMFC） and a 27-channel entire-cell （EC） were respectively conducted with a steady and nonisothermal and two-phase model. Results comparisons were conducted focusing on the distribution of the liquid water saturation, phase-change source terms and temperature in TU and EC. It is found that, there exist significant differences between the numerical predictions either in variation trend or in parameter range of TU and EC. For example the water saturation in TU is far less than that in EC under the same operational and computational conditions. This might be mainly resulted from the set up of boundary conditions in the computational domains. Thus the computational results by the methods of TU（which is widely adopted in present literatures） and EC represent different processes even under the same computational conditions.
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