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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 ：
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 ：
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 ：
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 ：
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 ：
本发明公开了一种平行流场与蛇形流场自动切换的燃料电池自适应流场板，流场板的结构包括：反应物进口和出口，进口总管和出口总管，流场板上设有若干条脊、流道和四周的流场板壁，总管两侧壁面上的凹槽以及布置的自适应结构。当总管中有积存的液态水时，流场中的自适应结构吸水膨胀，总管局部横截面积逐渐变小，甚至堵住总管，使流场板局部或全部从平行状流场变为蛇形流场；当总管中不再有积存的液态水时，在电池运行温度下受到气流吹扫，内部水分蒸发，自适应结构脱水收缩，变为平行流场。本发明能够根据总管中液态水含量发生自适应变化，适应不同的工况，加快液态水的移出，避免水淹现象，并减小泵功消耗，提升电池净功率的效果。
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| GB/T 7714 | 郭航 , 牟禹辉 , 叶芳 . 平行流场与蛇形流场自动切换的燃料电池液态水自适应流场板 : CN202111178528.4[P]. | 2021-10-10 . |
| MLA | 郭航 et al. "平行流场与蛇形流场自动切换的燃料电池液态水自适应流场板" : CN202111178528.4. | 2021-10-10 . |
| APA | 郭航 , 牟禹辉 , 叶芳 . 平行流场与蛇形流场自动切换的燃料电池液态水自适应流场板 : CN202111178528.4. | 2021-10-10 . |
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Abstract ：
In this paper, the experimental study on the forced convection heat transfer between molten salt and heat transfer oil was carried out by using the binary mixed molten salt (KNO3-Ca(NO3)2) prepared by our group. The total heat transfer coefficient of the molten salt-heat transfer oil under different working conditions was obtained. The convective heat transfer coefficient and the convection criterion number correlation of the molten salt in the tube and the molten salt side under the fully developed turbulent flow and transitional flow in the tube were obtained respectively by the Wilson's Separation Method and the Least Squares Method. The results show that the maximum deviation of turbulent experimental data is +23% compared with the classical correlation. By considering the variable properties of high-temperature molten salt, the viscosity equation is used to correct the Dittus-Boelter equation correlation. It is found that the maximum deviation between the modified Dittus-Boelter equation and the experimental test results is -15%. The deviation value is significantly reduced. The maximum deviation of the transitional flow experimental data from the Hausen equation and the Gnielinski equation is 10%. The test shows that the experimental results of this work are in good agreement with the classical heat transfer formula mentioned above, which isdications that the heat transfer relationship is still applicable to high temperature molten salt. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
Keyword ：
Heat transfer coefficients Heat transfer coefficients Calcium compounds Calcium compounds Forced convection Forced convection Potassium Nitrate Potassium Nitrate Transition flow Transition flow Fused salts Fused salts Least squares approximations Least squares approximations Potash Potash
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| GB/T 7714 | Chen, Hu , Wu, Yuting , Guo, Hang et al. Experimental study on forced convection heat transfer with low melting point molten salt in smooth tube [J]. | Acta Energiae Solaris Sinica , 2021 , 42 (2) : 25-30 . |
| MLA | Chen, Hu et al. "Experimental study on forced convection heat transfer with low melting point molten salt in smooth tube" . | Acta Energiae Solaris Sinica 42 . 2 (2021) : 25-30 . |
| APA | Chen, Hu , Wu, Yuting , Guo, Hang , Chen, Xia , Lu, Yuanwei , Ma, Chongfang . Experimental study on forced convection heat transfer with low melting point molten salt in smooth tube . | Acta Energiae Solaris Sinica , 2021 , 42 (2) , 25-30 . |
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Abstract ：
利用课题组自行配制的二元混合熔融盐(KNO_3-Ca(NO_3)_2)开展导热油与低熔点熔融盐的管内强制对流实验研究。通过实验得到导热油与低熔点熔融盐的总换热系数,并通过最小二乘法和Wilson分离法得到了管内低熔点熔融盐侧的对流换热系数及其准则关联式。与不同的经典传热关联式对比,最大偏差为+23%。考虑高温熔融盐的变物性特征,利用黏度项对Dittus-Boelter方程关联式进行修正。经过修正后的Dittus-Boelter方程与实验测试结果最大偏差为-15%,偏差值明显减小。过渡流实验数据和Hausen方程及Gnielinski方程的最大偏差均为10%,实验结果验证了传热关系式仍适用于高温...
Keyword ：
太阳能 太阳能 蓄热 蓄热 熔融盐 熔融盐 换热器 换热器 传热 传热 强迫对流 强迫对流
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| GB/T 7714 | 陈虎 , 吴玉庭 , 郭航 et al. 低熔点熔融盐管内强迫对流换热的实验研究 [J]. | 太阳能学报 , 2021 , 42 (02) : 25-30 . |
| MLA | 陈虎 et al. "低熔点熔融盐管内强迫对流换热的实验研究" . | 太阳能学报 42 . 02 (2021) : 25-30 . |
| APA | 陈虎 , 吴玉庭 , 郭航 , 陈夏 , 鹿院卫 , 马重芳 . 低熔点熔融盐管内强迫对流换热的实验研究 . | 太阳能学报 , 2021 , 42 (02) , 25-30 . |
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