Phase change characteristics and their effect on the performance of hydrogen recirculation ejectors for PEMFC systems

Han, Jiquan; Feng, Jianmei; Peng, Xueyuan

doi:10.1016/j.ijhydene.2021.10.049

Cited by 23 publications

(6 citation statements)

References 55 publications

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“…In [14], results showed an increase in temperature (due to latent heat of vaporization), lower velocity, and higher pressure of the gas phase due to condensation, resulting in a lower entrainment performance and better agreement with experimental results. In [34], the authors took into account both the homogeneous and the heterogeneous condensation. The two crucial factors that seem to influence the most droplet size were residence time and subcooling degree.…”

Section: Ejector Simulationmentioning

confidence: 79%

“…However, both Wang et al [32] and Ariafar et al [33] confirmed that the wet steam model is able to better capture flow patterns inside the ejector. Han et al [14,34] performed two-phase simulations to weigh the effect of liquid water on the ejector efficiency. In [14], results showed an increase in temperature (due to latent heat of vaporization), lower velocity, and higher pressure of the gas phase due to condensation, resulting in a lower entrainment performance and better agreement with experimental results.…”

Section: Ejector Simulationmentioning

confidence: 99%

“…Han et al [14,34] performed two-phase simulations to weigh the effect of liquid water on the ejector efficiency. In [14], results showed an increase in temperature (due to latent heat of vaporization), lower velocity, and higher pressure of the gas phase due to condensation, resulting in a lower entrainment performance and better agreement with experimental results. In [34], the authors took into account both the homogeneous and the heterogeneous condensation.…”

Section: Ejector Simulationmentioning

confidence: 99%

“…The hydrogen is primarily supplied to the PEMFC from the high-pressure hydrogen tank; the gas travels through the serpentine, and then, the exceeding part is recovered in a secondary circuit. It is worth noting that the nature of this "recovered" flow, two-phase multispecies, poses one of the major issues with ejector simulation [14].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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: Ejector Simulationmentioning

confidence: 79%

Section: Ejector Simulationmentioning

confidence: 99%

Section: Ejector Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…The results show that in order to reduce the demand for high pressure hydrogen, optimized ejectors can be used, thus reducing the energy consumption and refueling time. 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.…”

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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Development of an ejector for passive hydrogen recirculation in PEM fuel cell systems by applying 2D CFD simulation

Singer¹,

Köll²,

Pertl³

et al. 2023

Automot. Engine Technol.

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The anode subsystem is a major energy consumer of polymer-electrolyte-membrane (PEM) fuel cell systems. A passive hydrogen recirculation system, like an ejector, is an excellent solution to maximize hydrogen utilization while maintaining low parasitic losses. However, high development efforts are necessary to maximize the performance of the ejector for the entire operating range. This research paper provides part of a toolchain for ejector development, consisting in particular of a multi-parameter simulation based on rotational symmetric 2D CFD. The 2D CFD greatly helps optimize the design of the ejector, reducing development effort, and increasing accuracy. In addition, the main correlations between thermodynamic states and geometry on the entrainment ratio are evaluated. Subsequently, an ejector is designed for a PEM fuel cell application using 2D CFD and the results show in which operating range a single ejector can be applied. This toolchain enables rapid design and optimization of ejector geometry, saving development time and cost while increasing accuracy and extending the operating range.

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Phase change characteristics and their effect on the performance of hydrogen recirculation ejectors for PEMFC systems

Cited by 23 publications

References 55 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

Development of an ejector for passive hydrogen recirculation in PEM fuel cell systems by applying 2D CFD simulation

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