微孔间距和孔径对PEMFC气体扩散层表面液滴流动传输特性的影响

doi:10.19562/j.chinasae.qcgc.2024.06.009

Abstract

Abstract:

Proton exchange membrane fuel cell （PEMFC） is considered as one of the most promising power devices for new energy vehicles， whose performance is affected by the droplet formation and dynamic transport properties on the surface of the gas diffusion layer （GDL）. In this paper， based on the pseudo-potential model of the lattice-Boltzmann method （LBM）， the dynamic processes of droplet emergence， growth， and shedding from the GDL surface are simulated， and the effect of micro pore spacing and micro pore size on the dynamic characteristics of droplets on the surface of the GDL as well as the pressure drop in the flow channel are analyzed in detail. The research results show that in the case of dual inlet holes， when the distance between two micropores is less than a certain value， the two droplets will merge. The merged droplet will increase the pressure drop in the airflow channel and shorten the time for droplet discharge. When the two micropore spacing is sufficiently large， there is almost no interaction between the two droplets， with the same droplet exclusion time， and the pressure drop inside the flow channel decreases with the increase of the micropore spacing. And the pressure drop in the flow channel decreases with the increase of micropore spacing. The motion of droplets with different micropore sizes on the surface of GDL is mainly affected by the gas-actuated shear force， and the motion period of droplets with upstream micropore size larger than downstream micropore size is shorter compared to the motion period of droplets with larger downstream micropore size.

Key words: PEMFC, gas diffusion layer, lattice-Boltzmann method, pseudo-potential model

Binyan Yu,Jian Ma,Yisong Chen,Limin Geng,Qian Wang. Analysis on Influence of Micropore Spacing and Size on Droplet Flow Transport Characteristics on Gas Diffusion Layer in PEMFC[J].Automotive Engineering, 2024, 46(6): 1025-1033.

Figures/Tables 16

工况	$G W 1$	$G W 2$	接触角 $θ$
（a）	-0.3	0.3	40.6°
（b）	-0.2	0.2	59.5°
（c）	-0.1	0.1	75.3°
（d）	0.1	-0.1	103.2°
（e）	0.2	-0.2	117.0°
（f）	0.3	-0.3	135.1°

工况	上游孔径/ $μ m$	下游孔径/ $μ m$	$U i n / (m · s - 1)$	$U l / (m · s - 1)$
1	50	30	3.0	0.1
2	50	50	3.0	0.1
3	50	80	3.0	0.1
4	80	30	3.0	0.1
5	80	50	3.0	0.1
6	80	80	3.0	0.1

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Analysis on Influence of Micropore Spacing and Size on Droplet Flow Transport Characteristics on Gas Diffusion Layer in PEMFC

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References 27

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工况	上游孔径/ $μ m$	下游孔径/ $μ m$	$U i n / (m · s - 1)$	$U l / (m · s - 1)$
1	50	30	3.0	0.1
2	50	50	3.0	0.1
3	50	80	3.0	0.1
4	80	30	3.0	0.1
5	80	50	3.0	0.1
6	80	80	3.0	0.1

工况	上游孔径/ $μ m$	下游孔径/ $μ m$	$U i n / (m · s - 1)$	$U l / (m · s - 1)$
1	50	30	3.0	0.1
2	50	50	3.0	0.1
3	50	80	3.0	0.1
4	80	30	3.0	0.1
5	80	50	3.0	0.1
6	80	80	3.0	0.1

工况	上游孔径/ $μ m$	下游孔径/ $μ m$	$U i n / (m · s - 1)$	$U l / (m · s - 1)$
1	50	30	3.0	0.1
2	50	50	3.0	0.1
3	50	80	3.0	0.1
4	80	30	3.0	0.1
5	80	50	3.0	0.1
6	80	80	3.0	0.1