Design modification of two-dimensional supersonic ejector via the adjoint method

Samsam-Khayani, Hadi; Park, Seong‐Hyun; Ha, Man Yeong; Kim, Kyung Chun; Yoon, Sang Youl

doi:10.1016/j.applthermaleng.2021.117674

Cited by 7 publications

(2 citation statements)

References 34 publications

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“…Ma et al [43] performed a 3D CFD simulation and, at set operative conditions, considered 4 geometrical parameters to be optimized with a user-defined priority: nozzle diameter, nozzle position, secondary inlet diameter, and mixing chamber diameter. It is clear by now that the design geometry strongly depends on the defined criterion; therefore, more complex and comprehensive optimization algorithms [44][45][46][47][48][49][50] are needed. Table 1 reports a summary of the type of study performed, modelling adopted, and key findings for several literature papers.…”

Section: Literature Reviewmentioning

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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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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