Validation of flow partitioning model for high pressure hydrogen jets through small orifices

LI Xuefang; HE Qian; CHRISTOPHER D M; CHENG Lin

doi:10.16511/j.cnki.qhdxxb.2018.21.021

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (12) : 1095-1100. DOI: 10.16511/j.cnki.qhdxxb.2018.21.021

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Validation of flow partitioning model for high pressure hydrogen jets through small orifices

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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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hydrogen safety / hydrogen jets / flow partitioning model / model validation

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LI Xuefang, HE Qian, CHRISTOPHER D M, CHENG Lin. Validation of flow partitioning model for high pressure hydrogen jets through small orifices[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(12): 1095-1100 https://doi.org/10.16511/j.cnki.qhdxxb.2018.21.021

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