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
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.
李雪芳, 何倩, 柯道友, 程林. 高压氢气小孔泄漏射流分层流动模型与验证[J]. 清华大学学报（自然科学版）, 2018, 58(12): 1095-1100.
LI Xuefang, HE Qian, CHRISTOPHER D M, CHENG Lin. Validation of flow partitioning model for high pressure hydrogen jets through small orifices. Journal of Tsinghua University(Science and Technology), 2018, 58(12): 1095-1100.
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2018, Vol. 58 
