Transient characteristics investigation of the integrated ejector-driven hydrogen recirculation by multi-component CFD simulation

Han, Jiquan; Zhao, Bin; Pang, Zihui; Feng, Jianmei; Peng, Xueyuan

doi:10.1016/j.ijhydene.2022.06.236

Cited by 17 publications

(3 citation statements)

References 44 publications

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“…Nitrogen may cross from cathode to anode through membrane due to the concentration gradient, and its accumulation negatively impacts the ER [62]. At the same time, a high purging frequency increases hydrogen consumption and leads to pressure fluctuations that may damage the membrane [82,83]: keeping the pressure difference within the threshold with fast transient responses is a crucial issue for the safe operation of PEM fuel cell system [84]. For what regards ejector integration in the overall energy system, as shown in the previous chapter, different geometries have been proposed through years since the simple design suffers of low range coefficient.…”

Section: System Integration and Controlmentioning

confidence: 99%

State of the Art of Modelling and Design Approaches for Ejectors in Proton Exchange Membrane Fuel Cell

Antetomaso

2024

Modelling and Simulation in Engineering

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Proton exchange membrane fuel cell (PEMFC) has a promising future in the power generation and transportation fields. Recirculation of unused anodic gases is fundamental to achieve a high-performance energy system, and this is usually attained employing ejectors or pumps. With respect to the latter, ejectors present no moving parts, thus resulting in both higher overall efficiency of the system and lower maintenance cost. Their main drawback is represented by the narrow optimal operative range: the entrainment ratio (ER) greatly depends on primary pressure, working pressure, and operative condition in general. In the last decade, numerous authors focused their efforts on fully comprehending and correctly simulating their working principles and analyzing how geometrical parameters influence ER and design different geometries to enlarge the operative range. The aim of this paper is to present in an ordered and clear manner the state of the art of ejector design, both from simulative (turbulence model, single or multiphase stream, etc.) and empirical (commonly used “rule of thumb”) points of view.

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Section: System Integration and Controlmentioning

confidence: 99%

State of the Art of Modelling and Design Approaches for Ejectors in Proton Exchange Membrane Fuel Cell

Antetomaso

2024

Modelling and Simulation in Engineering

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“…Han et al [99] focused on exploring the characteristics of phase transition and two-phase flow in hydrogen recycling ejectors and established a two-phase CFD model with phase transition based on the classical theory of nucleation and droplet growth. In the same year, Han et al [100] also created a three-dimensional multicomponent model to calculate the dynamics model of the fluid to study the synergistic transient properties of hydrogen recycling components (hydrogen ejector, and purge valve) in 80 kW PEMFC. The results showed that the entrainment performance of the ejector decreased under unsteady purging.…”

Section: An Overview Of the Numerical Simulation Of An Ejectormentioning

confidence: 99%

A Review of the Research Progress and Application of Key Components in the Hydrogen Fuel Cell System

Li,

Wu,

Cheng

et al. 2024

Processes

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The hydrogen cycle system, one of the main systems used for hydrogen fuel cells, has many advantages. It can improve the efficiency, the water capacity, and the management of thermal fuel cells. It can also enhance the safety of the system. Therefore, it is widely used in hydrogen fuel cell vehicles. We introduce the structure and principles of hydrogen cycle pumps, ejectors, and steam separators and analyze and summarize the advantages of the components, as well as reviewing the latest research progress and industrialization status of hydrogen cycle pumps and ejectors. The technical challenges in hydrogen circulation systems and the development direction of key technologies in the future are discussed. This paper aims to provide a reference for research concerning hydrogen energy storage application technology in hydrogen fuel cell systems.

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“…Chen et al [16] optimized the key geometrical parameters, such as the nozzle diameters of the big nozzle (BN) and small nozzle (SN), as well as the axial distance between the two nozzles through CFD simulation. Han et al [17] developed a three-dimensional multicomponent CFD model to investigate the synergistic transient characteristics of the hydrogen recirculation components (hydrogen injector, ejector, and purge valve) in an 80 kW PEMFC. However, CFD is time-consuming and cannot be implemented in real-time control.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Control of Ejector-Based Hydrogen Circulation System for Proton Exchange Membrane Fuel Cell Systems

Xu,

Liu,

Tong

et al. 2024

Energies

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Ejector-based proton exchange membrane fuel cells (PEMFCs) are of great interest due to their simplicity and feasibility. Thus, proton exchange membrane fuel cells are considered the most suitable technology for in-vehicle systems, industrial applications, etc. Despite the passive characteristics of the ejector, active control of the hydrogen supply system is needed to ensure sufficient hydrogen, maintain the stack pressure, and ensure effective entrainment. In this research, a novel semi-empirical model is proposed to accurately predict the entrainment performance of the ejector with an 80 kW fuel cell system. According to the precise semi-empirical model, the hydrogen supply system and the anode channel are modeled. Then, a fuzzy logic controller (FLC) is developed to supply sufficient and adequate gas flow and maintain the rapid dynamic response. Compared to the conventional proportional–integral–derivative controller, the fuzzy logic controller could reduce the anode pressure variability by 5% during a stepped case and 2% during a dynamic case.

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Transient characteristics investigation of the integrated ejector-driven hydrogen recirculation by multi-component CFD simulation

Cited by 17 publications

References 44 publications

State of the Art of Modelling and Design Approaches for Ejectors in Proton Exchange Membrane Fuel Cell

State of the Art of Modelling and Design Approaches for Ejectors in Proton Exchange Membrane Fuel Cell

A Review of the Research Progress and Application of Key Components in the Hydrogen Fuel Cell System

Modeling and Control of Ejector-Based Hydrogen Circulation System for Proton Exchange Membrane Fuel Cell Systems

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