Abstract ▼ AI-Helper

The purpose of this study is to analyze the inlet hydrogen temperature change and outlet pressure change of the check valve, which is one of the parts of the hydrogen storage system, the thermal flow characteristics inside the check valve according to the design parameters of the diverter flow path ...

The purpose of this study is to analyze the inlet hydrogen temperature change and outlet pressure change of the check valve, which is one of the parts of the hydrogen storage system, the thermal flow characteristics inside the check valve according to the design parameters of the diverter flow path shape, and the temperature rise rate in the outlet region due to the Joule-Thomson effect. The analysis conditions were selected according to the inlet temperature range and outlet pressure range prescribed by the hydrogen refueling protocol, and CFD numerical analysis was performed for the round and diameter shape changes of the diverter flow path inside the valve operating part. To ensure the reliability of the numerical analysis results, a grid dependency test was conducted, and it was found that the mesh size of 0.2mm had the least influence on the analysis results, and the influence of the actual gas equation on the results was analyzed, and the SRK EOS model was selected and applied. Through this analysis, the influence factors on the flow characteristics of the check valve were analyzed, and it was determined that the outlet pressure change condition compared to the inlet hydrogen temperature condition had an important effect on the internal flow characteristics and valve performance, and the pressure change in the outlet region had an important effect on the temperature rise phenomenon due to the Joule-Thomson effect. In the case of the shape change condition, it was confirmed that the performance of the check valve was not affected by changing the round shape, and the performance of the flow coefficient of hydrogen was improved by increasing the diameter. In addition, it was determined that the shape change condition did not have a significant effect on the performance improvement on the effect of temperature rise in the outlet region due to the Joule-Thomson effect.

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