Flow velocity oscillations in a PEM fuel cell cathode channel induced by harmonic pressure perturbations

被引：5
|
作者：
Kulikovsky, Andre [1 ,2 ]
机构：
[1] Forschungszentrum Julich, Inst Energy & Climate Res, Theory & Computat Energy Mat IEK13, D-52425 Julich, Germany
[2] Lomonosov Moscow State Univ, Res Comp Ctr, Moscow 119991, Russia
来源：
JOURNAL OF POWER SOURCES | 2023年 / 558卷
关键词：
EPIS; cFRA; PEM fuel cell; Modeling; ALTERNATING FREQUENCY-RESPONSE;
D O I：
10.1016/j.jpowsour.2022.232544
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
To measure electrochemical pressure impedance spectra, oscillating pressure gradient is applied at the PEM fuel cell channel inlet or outlet. A model for air flow velocity oscillations induced by the AC pressure gradient is developed. The Nyquist spectrum of velocity oscillations has a form of a parallel RC-circuit electric impedance. Due to viscous forces, the amplitude of oscillations decays with the frequency. Analytical solution allows one to estimate this amplitude and the characteristic frequency of damping. A dominating effect of velocity oscillations on the pressure impedance at low air flow stoichiometries is demonstrated.
引用
收藏
页数：6
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