Abstract
In high-pressure hydrogen systems, the check valve is one of the most easy-to-damage components. Generally, the high-pressure hydrogen flow can generate a strong impact on the check valve, which can cause damage and failure. Therefore, it is useful to study the transient flow characteristics of the high-pressure hydrogen flow in check valves. Using dynamic mesh generation and the National Institute of Standards and Technology (NIST) real hydrogen gas model, a transient-flow model of the high-pressure hydrogen for the check valve is established. First, the flow properties of high-pressure hydrogen during the opening process is investigated, and velocity changes and pressure distribution of hydrogen gas flow are studied. In addition, the fluid force, acceleration, and velocity of the valve spool are analyzed quantitatively. Subsequently, the effect of the hydrogen inlet-pressure on the movement characteristic of the valve spool is investigated. The results of this study can improve both the design and applications of check valves in high-pressure hydrogen systems.
Highlights
With the rapid development of hydrogen energy and fuel-cell technology [1,2], hydrogen systems, in particular hydrogen-production, -storage, -transportation, and fuel-cell applications attract an increasing amount of research interest [3,4,5]
To investigate mesh density effect the flow characteristic, three models with different densities were applied and analyzed this paper. This was implemented by comparing the displacement
10b shows the section of section of the flow channel for the valve spool, which provides a better representation of the the flow channel for the valve which provides better representation of the pressure distribution pressure distribution insidespool, the valve spool
Summary
With the rapid development of hydrogen energy and fuel-cell technology [1,2], hydrogen systems, in particular hydrogen-production, -storage, -transportation, and fuel-cell applications attract an increasing amount of research interest [3,4,5]. Because of higher efficiency and better economics, both storage and the transportation of hydrogen uses mainly high-pressure technology [6,7]. More than 90% of all hydrogen refueling stations in the world use high-pressure storage methods [8,9]. Because of the risk of leakage and explosion in these high-pressure hydrogen refueling stations, a study of the safety hazards is important [10]. In May and June 2019, two explosion accidents occurred at the hydrogen refueling stations in South Korea and Norway [11]. The safety of a hydrogen system is a key issue for the commercialization of hydrogen energy
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