In order to study the inlet relative humidity (RH) effects on the performance of proton exchange membrane fuel cell (PEMFC), the inlet humidification efficiency (IHE) model is proposed. The total water content of PEMFC is consisted of two parts including the internal electro-migration water content and the external water content of the humidified gas. The dynamic inlet humidification efficiency is derived. The current density of PEMFC is calculated by the incorporating parameters including inlet humidification efficiency and water content of the humidified gas in the IHE model. Firstly, the schedule diagram of calculation is given and the geometric model is established according to actual size of PEMFC. The computational meshes are partitioned by using the software (Gambit). The IHE model is imported into the computational fluid dynamics software (Fluent). Secondly, the experimental system is established and experiments have been done at the operating temperature of 70 °C and at 40% RH, 55% RH, 70% RH, 85% RH and 100% RH, respectively. Finally, the contours of ${\text{H}}_2\text{O}$ molar concentrations (both in anode channels and cathode channels), membrane water content (MWC) and polarization curves of the IHE model, the Fluent model and experimental are compared and analyzed at above experimental conditions. The results show that the species distribution uniformities of the IHE model such as ${\text{H}}_2\text{O}$ molar concentrations (both in anode channels and cathode channels) and MWC are the best when the PEMFC at 100% RH. When the operating temperature is 70 °C (40% RH and $350\text{mA}/{\text{cm}}^2$), the accuracy of the IHE model is improved by 79% compared with the Fluent model. When the operating temperature is 70 °C (40% RH and $350\text{mA}/{\text{cm}}^2$), the inlet humidification efficiency reaches 57%.

为了研究进口相对湿度（RH）对质子交换膜燃料电池（PEMFC）性能的影响，提出了进口加湿效率（IHE）模型。PEMFC的总水含量由两部分组成，包括内部电迁移水含量和加湿气体的外部水含量。得出动态入口加湿效率。在IHE模型中，PEMFC的电流密度是通过合并参数来计算的，这些参数包括入口加湿效率和加湿气体的水含量。首先给出了计算进度图，并根据PEMFC的实际尺寸建立了几何模型。通过使用软件（Gambit）对计算网格进行分区。IHE模型将导入到计算流体动力学软件（Fluent）中。其次，建立了实验系统，并分别在70°C的工作温度和40％RH，55％RH，70％RH，85％RH和100％RH的工作温度下进行了实验。最后，${\text{H}}_{\mathrm{2个}}\text{Ø}$在上述实验条件下，对IHE模型，Fluent模型和实验的摩尔浓度（阳极通道和阴极通道中的摩尔浓度），膜水含量（MWC）和极化曲线进行了比较和分析。结果表明，IHE模型的物种分布均匀性如。${\text{H}}_{\mathrm{2个}}\text{Ø}$当PEMFC在100％RH时，摩尔浓度（阳极通道和阴极通道中）和MWC最好。当工作温度为70°C（40％RH和$350\text{嘛}/{\text{厘米}}^{\mathrm{2个}}$），与Fluent模型相比，IHE模型的准确性提高了79％。当工作温度为70°C（40％RH和$350\text{嘛}/{\text{厘米}}^{\mathrm{2个}}$），入口加湿效率达到57％。