THERMAL ENGINEERING |
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Validation of flow partitioning model for high pressure hydrogen jets through small orifices |
LI Xuefang1, HE Qian1, CHRISTOPHER D M2, CHENG Lin1 |
1. Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China; 2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China |
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Abstract High pressure hydrogen jets are a critical topic in hydrogen safety research. Numerical simulations validated by measurements are an essential way to study high pressure hydrogen jets. However, the complete modeling of high pressure hydrogen jets is inefficient, unstable and difficult to converge, while the existing simplified models are based on non-physical assumptions and result in inaccurate predictions. A flow partitioning model based on quantitative shock structure measurements was developed by combining a real gas equation of state with the flow and energy conservation equations. The flow partitioning model takes into account the different flow conditions in the core flow region and the mixing layer and avoids modeling the shock region where the gas state varies dramatically which significantly simplifies the calculation. The predicted velocity and concentration distributions using the flow partitioning model agree well with the predictions by the complete model and with measurements, with these predictions being superior to predictions using the canonical notional nozzle model. The present study provides a reduced order modeling approach that simplifies the simulations without sacrificing the accuracy which will benefit hydrogen safety research.
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Keywords
hydrogen safety
hydrogen jets
flow partitioning model
model validation
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Issue Date: 13 December 2018
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