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RISS 인기검색어
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- 저자 : Guoling Wang (검색결과 3 건)
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Yang Guogang,Wang Hao,Su Fengmin,Li Shian,Zhang Guoling,Sun Juncai,Shen Qiuwan,Jiang Ziheng,Liao Jiadong,Chen Pengyu 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Proton exchange nembrane fuel cells (PEMFCs) are highly promising energy devices for future transportation and distributed power stations. The electrochemical performance of PEMFCs assembled with gas diffusion layer (GDL) of different porosity gradient distributions has been analyzed using the lattice Boltzmann method. A single-phase multi-component lattice Boltzmann model employing the active approach was developed to investigate the reactive gas flow within the GDL. Two types of GDLs with the same porosity, namely multilayer porosity gradient GDLs and linear porosity gradient GDLs, were generated to investigate the effect of the porosity gradient of the GDL on the electrochemical performance of PEMFC. The results show that the two types of porosity gradient GDL improve oxygen starvation problems and enhance water management, and that the GDLs with smaller porosity gradients can increase the mean current density. This paper develops the study of pore-scale analysis of PEMFC performance and can provide guidance for the design of GDL structures.
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Short‑circuit fault detection scheme for DC microgrids on offshore platforms
Zhenyu Li,Huiran Sui,Ruifang Zhang,Guoling Wang,Huiyin Cai 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.5
DC microgrids present a very effective solution that enables the power systems of offshore platforms to achieve increased integration of renewable sources. Since the areas of offshore platforms are limited, the associated DC microgrids have lower line impedances, and short-circuit faults cause fault currents to rise rapidly. Thus, fault detection is a challenging issue due to the strict time limits for interruption imposed by these rapid rising fault currents. According to the fault characteristics and the ring structure of DC microgrids, this paper proposes a rapid detection scheme based on the differential current and current derivative without de-energizing the entire DC microgrid. It achieves rapid and selective fault detection and ensures an uninterruptible load power. The synchronization issues of the current differential and a rapid processing method for fault currents are investigated. The tripping threshold settings are discussed. Implementation of the fault detection scheme is also presented in detail. The proposed scheme is verified on a physical experimental platform. It is shown that here are some advantages such as good selectivity, low cost, and rapid fault detection. The scheme provides a strong guarantee for the uninterruptible operation of important equipment on offshore platforms.
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Yang Guogang,Liao Jiadong,Shen Qiuwan,Li Shian,Jiang Ziheng,Wang Hao,Li Zheng,Zhang Guoling,Huang Naibao 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Droplet purging in the gas diffusion layer (GDL) is the key to improving the performance of proton exchange membrane fuel cells (PEMFCs). Lattice Boltzmann method (LBM) is used to study the dynamic behavior of multiple droplets randomly distributed in the GDL under air purging. The GDL is randomly reconstructed. The effects of rib width, initial water content, contact angle and air velocity are studied. By analyzing the dynamic distribution of droplets in the GDL and the change of the remaining water content with time, it is found that the droplets are only a small amount under the rib and accumulated mostly on both sides of the GDL at stabilization, which is caused by the large velocity under the rib. The residual water content in the GDL increases with the increase of the initial water content, and decreases with the increase of the rib width, contact angle and air velocity. However, when the rib to channel width ratio exceeds 1, the improvement of purging effect is not obvious, the purging time increases significantly, and the increase of air velocity does not help much to remove the droplets accumulated on both sides of the GDL.
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