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学者姓名：郭航
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Abstract ：
通过实验得到了一体式再生燃料电池(unitized regenerative fuel cell, URFC)模式切换过程中电池内部的两相流观测可视化结果以及同步电压动态变化情况，讨论了温度影响下燃料电池和电解池模式切换过程中的两相流动规律以及同步电池电压的变化规律。实验结果显示：当电解池直接切换到燃料电池模式时，由于水淹的影响，电池电压接近0.0 V,同时受温度影响不大；当电池在运行不供水电解模式下120.00 s后切换时，电池能够在高温状态下切换至燃料电池模式，且温度较高时氧气侧水淹较弱。燃料电池向电解池模式切换时，温度和电流密度的高低同样会影响电解模式下的性能稳定性。
Keyword ：
可视化观测 可视化观测 一体式再生燃料电池 一体式再生燃料电池 模式切换 模式切换 两相流 两相流
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| GB/T 7714 | 刘佳兴 , 郭航 , 叶芳 . 不同温度下URFC模式切换中两相流及电压响应 [J]. | 热科学与技术 , 2023 , 22 (06) : 591-598 . |
| MLA | 刘佳兴 等. "不同温度下URFC模式切换中两相流及电压响应" . | 热科学与技术 22 . 06 (2023) : 591-598 . |
| APA | 刘佳兴 , 郭航 , 叶芳 . 不同温度下URFC模式切换中两相流及电压响应 . | 热科学与技术 , 2023 , 22 (06) , 591-598 . |
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Abstract ：
Oxygen side flow channel structures have significant influence on the dynamic response of relevant parameters in operation mode switching procedures of a unitized regenerative fuel cell. In this paper, an unsteady, non-isothermal, two-phase, two-dimensional unitized regenerative fuel cell model is established to study the dynamic response of two-phase species concentration distributions, current density distributions etc. when the cell mode swiches from the fuel cell mode to the electrolyzer when using orientational flow channel at the oxygen side. The influence of eight oxygen-side channels on the mode switching process is compared. Results show that the required time for each parameter reaching the stable state in the fuel cell mode is longer than the dynamic response time after switching to electrolytic cell mode when using orientational flow channels. In addition, different flow channel structures at the oxygen-side affect the time requirement for stabilizing each parameter during mode switching, while they do not change the characteristics of the stable state mode.(c) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
Mode switching Mode switching Orientational flow channel Orientational flow channel Dynamic response Dynamic response Mass transfer Mass transfer Unitized regenerative fuel cell Unitized regenerative fuel cell
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| GB/T 7714 | Guo, Hang , Song, Jia , Ye, Fang et al. Dynamic response during mode switching of unitized regenerative fuel cells with orientational flow channels [J]. | RENEWABLE ENERGY , 2022 , 188 : 698-710 . |
| MLA | Guo, Hang et al. "Dynamic response during mode switching of unitized regenerative fuel cells with orientational flow channels" . | RENEWABLE ENERGY 188 (2022) : 698-710 . |
| APA | Guo, Hang , Song, Jia , Ye, Fang , Fang, M. A. Chong . Dynamic response during mode switching of unitized regenerative fuel cells with orientational flow channels . | RENEWABLE ENERGY , 2022 , 188 , 698-710 . |
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Abstract ：
Proton exchange membrane fuel cells are widely utilized in the areas of aerospace, military and vehicles. Enhancing the reactant transportation and improving water, heat management can effectively increase the electrochemical reaction rate and power output. Orientated-type flow channels have been proved to be effective on improving mass transporting and enhancing performance. In this study, a flow field plate with transparent observation window, whose channel side wall is designed as transparent side-plates, is fabricated to achieve the side-view observation on liquid movement behaviors inside fuel cells. The visualization results of reactant gas and liquid water generation and flowing behaviors in channel regions are observed through the side direction for the first time. Experimental results infer that: orientated-type flow channels having baffles affect droplet generation, moving and shape in gas flow channels, and higher current densities result in more liquid water generation. The baffle downstream region having sudden expanded region slows down droplet moving, and baffle upstream sides accelerates droplet moving. Moreover, the generated heat of electrochemical reaction cannot satisfy maintaining a higher cell working temperature requirement, and an extra heating procedure is required.(c) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
Side-view observation method Side-view observation method Two-phase flow Two-phase flow Orientated-type gas channel Orientated-type gas channel Mass transportation Mass transportation Proton exchange membrane fuel cell Proton exchange membrane fuel cell
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| GB/T 7714 | Guo, Hang , Zhao, Qiang , Ye, Fang . An experimental study on gas and liquid two-phase flow in orientated-type flow channels of proton exchange membrane fuel cells by using a side-view method [J]. | RENEWABLE ENERGY , 2022 , 188 : 603-618 . |
| MLA | Guo, Hang et al. "An experimental study on gas and liquid two-phase flow in orientated-type flow channels of proton exchange membrane fuel cells by using a side-view method" . | RENEWABLE ENERGY 188 (2022) : 603-618 . |
| APA | Guo, Hang , Zhao, Qiang , Ye, Fang . An experimental study on gas and liquid two-phase flow in orientated-type flow channels of proton exchange membrane fuel cells by using a side-view method . | RENEWABLE ENERGY , 2022 , 188 , 603-618 . |
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Abstract ：
Orientated-type flow channels of proton exchange membrane fuel cells having baffles increase the cell performance, however, the higher power loss accounted by baffles, is a non-ignorable disadvantage. Previous literature proves that the baffles in channels cause the increase in power losses, while how the baffles affect the power losses, including the frictional losses and local losses, are still not analyzed before. Therefore, in this paper, a two-dimensional model is developed to study the friction loss and local loss in the flow channels with baffles. The numerical model, which couples the non-Darcy flow effect, is validated by comparing with self-conducted experimental results. Experimental and simulation results reveal that: orientated-type flow channels facilitate enhance the power output, and with the enlargement of baffles, the performance is further enhanced. In addition, the frictional losses and local losses in the orientated-type flow channels are comparatively studied by a numerical approach for the first time. It is found that using the materials with low surface roughness can decrease the friction loss; and avoiding sudden expanded segments at leeward sides of baffles can reduce the local loss. The experimental results and simulation results can further help improve the flow channel design. (c) 2021 Elsevier Ltd. All rights reserved.
Keyword ：
Orientated-type flow channel Orientated-type flow channel Local loss Local loss Frictional loss Frictional loss Flow channel design Flow channel design Proton exchange membrane fuel cell Proton exchange membrane fuel cell
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. Cell performance and flow losses of proton exchange membrane fuel cells with orientated-type flow channels [J]. | RENEWABLE ENERGY , 2022 , 181 : 1338-1352 . |
| MLA | Chen, Hao et al. "Cell performance and flow losses of proton exchange membrane fuel cells with orientated-type flow channels" . | RENEWABLE ENERGY 181 (2022) : 1338-1352 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Fang, Chong . Cell performance and flow losses of proton exchange membrane fuel cells with orientated-type flow channels . | RENEWABLE ENERGY , 2022 , 181 , 1338-1352 . |
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Abstract ：
通过数值模拟的方法，从稳态和驾驶循环2种工况对供氢系统辅助供冷方案进行评价。仿真结果表明：氢气的高膨胀比有利于空调系统能耗的下降。当环境温度为45℃，在中国乘用车驾驶工况下，辅助供冷方案可使空调系统能耗下降5.4%。但辅助供冷方案会给空调系统的稳定运行和座舱温度的控制带来一定的挑战。
Keyword ：
热管理 热管理 燃料电池汽车 燃料电池汽车 数值模拟 数值模拟 高压供氢 高压供氢 氢气 氢气
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| GB/T 7714 | 宋泽华 , 叶芳 , 陈浩 et al. 燃料电池汽车高压供氢系统辅助供冷仿真 [J]. | 太阳能学报 , 2022 , 43 (06) : 530-535 . |
| MLA | 宋泽华 et al. "燃料电池汽车高压供氢系统辅助供冷仿真" . | 太阳能学报 43 . 06 (2022) : 530-535 . |
| APA | 宋泽华 , 叶芳 , 陈浩 , 郭航 , Zhang Weibo . 燃料电池汽车高压供氢系统辅助供冷仿真 . | 太阳能学报 , 2022 , 43 (06) , 530-535 . |
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Abstract ：
In this study, a two-dimensional, two-phase, non-isothermal and steady-state modified model of proton exchange membrane fuel cells is developed. The Forchheimer's effect (Non-Darcy effect) is coupled in the model, and its impact on liquid water removing process in flow channels with baffles having different shapes is discussed. Simulation results show that the liquid water is able to be removed more at the regions around baffles. At the same time, the baffle shapes reform the liquid water distribution. When using the baffles having larger dimensions (e.g. using rectangular baffles or trapezoidal baffles), the flow spaces around baffles decrease more and the liquid water is removed more because of the increase in local flow velocity. As a result, the concentration polarization is weakened and cell performance is improved more. Moreover, a streamline baffled flow channel that is designed for the purpose of both increasing the cell performance and avoiding excessive increase in pressure drops is discussed. Simulation results show that this flow channel design can both avoid too much increase in pressure drop and facilitate the liquid water removing out from the fuel cell. © 2020 Hydrogen Energy Publications LLC
Keyword ：
Drops Drops Liquids Liquids Channel flow Channel flow Proton exchange membrane fuel cells (PEMFC) Proton exchange membrane fuel cells (PEMFC) Flow velocity Flow velocity Pressure drop Pressure drop Water supply systems Water supply systems
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. Forchheimer's inertial effect on liquid water removal in proton exchange membrane fuel cells with baffled flow channels [J]. | International Journal of Hydrogen Energy , 2021 , 46 (3) : 2990-3007 . |
| MLA | Chen, Hao et al. "Forchheimer's inertial effect on liquid water removal in proton exchange membrane fuel cells with baffled flow channels" . | International Journal of Hydrogen Energy 46 . 3 (2021) : 2990-3007 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Ma, Chong Fang . Forchheimer's inertial effect on liquid water removal in proton exchange membrane fuel cells with baffled flow channels . | International Journal of Hydrogen Energy , 2021 , 46 (3) , 2990-3007 . |
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Abstract ：
Orientated-type flow channels of proton exchange membrane fuel cells cause non-Darcy effect occurring in flow regions. Therefore, the species transportation is affected by inertial effect. However, how the inertial force affects convection and diffusion of different species has not been discussed before. Thus, a modified two-dimensional, non-isothermal, two-phase and steady state model considering non-Darcy effect is employed in this study, and reactants and products transportations through diffusion and convection under inertial effects are quantitatively analyzed for the first time. Simulation results reveal that the convective transportation of reactants increases more under the influence of inertial force; water vapor transportation through convection increases the water content in porous regions. At the same time, liquid water expels more rapidly from gas diffusion layers under baffle regions, and enlarging baffle volumes increases the regions where the liquid water is rapidly removed under the inertial effect. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Orientated-type flow channel Orientated-type flow channel Reactant utilization rate Reactant utilization rate Non-Darcy flow effect Non-Darcy flow effect Proton exchange membrane fuel cell Proton exchange membrane fuel cell Two-phase mass transfer Two-phase mass transfer
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. Improving two-phase mass transportation under Non-Darcy flow effect in orientated-type flow channels of proton exchange membrane fuel cells [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (41) : 21600-21618 . |
| MLA | Chen, Hao et al. "Improving two-phase mass transportation under Non-Darcy flow effect in orientated-type flow channels of proton exchange membrane fuel cells" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 41 (2021) : 21600-21618 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Ma, Chong Fang . Improving two-phase mass transportation under Non-Darcy flow effect in orientated-type flow channels of proton exchange membrane fuel cells . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (41) , 21600-21618 . |
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Abstract ：
Orientated-type flow channels having porous blocks enhance the reactant transfer into gas diffusion layers of proton exchange membrane fuel cells. However, because of the blockages accounted by baffles and porous blocks in channel regions, pumping power increases. In this study, with the aim of further reducing the pumping power in flow channels with porous-blocked baffles, an orientated-type flow channel with streamline baffles having porous blocks is proposed. By employing an improved two-fluid model, cell performance, liquid water distribution and pumping power in a single flow channel are numerically studied. The simulation results show that the baffles with porous blocks increase the cell performance, and the streamline baffles with larger volumes further increase the performance; the produced water in porous regions is ejected more under inertial effect, especially at the regions near to baffles in gas diffusion layers and inside porous blocks. In addition, by using the streamline baffles, the excessive increase in power loss is further reduced. Moreover, the location and porosity effects of baffles with porous blocks are analyzed. Simulation results show that the location exhibits obscure effects on reactant transfer and cell performance, while the liquid water can be removed more when the porous blocked baffles are concentrated at downstream. The net power is enhanced more when using three porous blocks with the porosity of 0.00. (c) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Forchheimer's effect Forchheimer's effect Proton exchange membrane fuel cell Proton exchange membrane fuel cell Flow channel design Flow channel design Mass transfer Mass transfer Orientated-type flow channel Orientated-type flow channel
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. A numerical study of orientated-type flow channels with porous-blocked baffles of proton exchange membrane fuel cells [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (57) : 29443-29458 . |
| MLA | Chen, Hao et al. "A numerical study of orientated-type flow channels with porous-blocked baffles of proton exchange membrane fuel cells" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 57 (2021) : 29443-29458 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Ma, Chong Fang . A numerical study of orientated-type flow channels with porous-blocked baffles of proton exchange membrane fuel cells . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (57) , 29443-29458 . |
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Abstract ：
Improving energy utilization efficiency and exploiting renewable energy source have become more crucial with the growing concern on energy crisis and environmental problem. Organic Rankine cycle, a clean, low-cost, and efficient energy utilization technology, is eliciting increasing attention. In this study, the recent research studies on organic Rankine cycle configuration modifications integrated with pure organic fluid are summarized from the perspectives of nomenclature, configuration modifications, theoretical and numerical methods, and experimental development. Results reveal that the nomenclature on the common organic Rankine cycle configurations is confusing; the research studies on organic Rankine cycle configurations are mainly focused on numerical research studies, and theoretical and experimental research studies are relatively limited. The experimental and numerical studies are mostly related to organic Rankine cycle with a recuperator due to its higher thermal and exergy efficiencies. Most experimental research studies are contributed by Chinese scholars, which indicate that China has paid much attention to improving the global environment. More theoretical and experimental research studies on other organic Rankine cycle configurations are urgently needed.
Keyword ：
reheat reheat regenerative regenerative cycle configuration cycle configuration recuperator recuperator ejector ejector organic Rankine cycle organic Rankine cycle
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| GB/T 7714 | Li, Jun Fen , Guo, Hang , Lei, Biao et al. An overview on subcritical organic rankine cycle configurations with pure organic fluids [J]. | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2021 , 45 (9) : 12536-12563 . |
| MLA | Li, Jun Fen et al. "An overview on subcritical organic rankine cycle configurations with pure organic fluids" . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH 45 . 9 (2021) : 12536-12563 . |
| APA | Li, Jun Fen , Guo, Hang , Lei, Biao , Wu, Yu Ting , Ye, Fang , Ma, Chong Fang . An overview on subcritical organic rankine cycle configurations with pure organic fluids . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2021 , 45 (9) , 12536-12563 . |
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Abstract ：
Reactants and products distribute unevenly in flow channels of proton exchange membrane fuel cells, therefore, the baffle heights and locations in flow channels exhibit effects on species transportation. In this study, a two-dimensional, two-phase, non-isothermal, and steady state model is developed to study the baffle heights and locations effects on mass transportation and performance of the fuel cells with orientated-type channels. Simulation results show that: uniformly distributing baffles in a flow channel can both enhance the reactants transportation and help expel more liquid water, resulting in higher net powers; although using a big baffle at the upstream segment of a channel enhances the performance more, while the water accumulating is also increased more. Reducing the baffle heights accounts for weaker reactants transfer enhancements and worse liquid water expelling; moving the baffles backwardly also causes the decrease in reactant transportation, while the liquid water expelling process is increased. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Keyword ：
Two-phase mass transfer Two-phase mass transfer Proton exchange membrane fuel cell Proton exchange membrane fuel cell Baffle location Baffle location Baffle dimension Baffle dimension Orientated-type flow channel Orientated-type flow channel
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| GB/T 7714 | Chen, Hao , Guo, Hang , Ye, Fang et al. A numerical study of baffle height and location effects on mass transfer of proton exchange membrane fuel cells with orientated-type flow channels [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (10) : 7528-7545 . |
| MLA | Chen, Hao et al. "A numerical study of baffle height and location effects on mass transfer of proton exchange membrane fuel cells with orientated-type flow channels" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 10 (2021) : 7528-7545 . |
| APA | Chen, Hao , Guo, Hang , Ye, Fang , Ma, Chong Fang . A numerical study of baffle height and location effects on mass transfer of proton exchange membrane fuel cells with orientated-type flow channels . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (10) , 7528-7545 . |
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