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Isentropic analysis and numerical investigation on high-pressure hydrogen jets with real gas effects |
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| Affiliation: | 1. School of Mechanical, Electronic and Engineering, Beijing Jiaotong University, Beijing 100044, PR China;2. Beijing Key Laboratory of Powertrain for New Energy Vehicle, Beijing Jiaotong University, Beijing 100044, PR China;3. Tsing-standard Automotive Technology Co.,Ltd., Suzhou 215200, PR China;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, China;2. Jiangsu Key Laboratory of Urban and Industrial Safety, Nanjing Tech University, Nanjing, 211816, China;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu, 211816, China;2. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing Tech University, Nanjing, Jiangsu, 211816, China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui, People''s Republic of China;2. Department of Aerospace Engineering, University of Maryland, College Park, MD 20742, USA;3. School of Chemical Machinery, Dalian University of Technology, Dalian 116024, Liaoning, People''s Republic of China |
| Abstract: | The present work performs the isentropic analysis and numerical simulation of high-pressure hydrogen jets to study the hydrogen leakage. The exit parameters and the flow characteristics are studied with the ideal gas assumption and real gas effects. The jet exit parameters calculated by the real gas thermodynamic model are different from the results obtained by the ideal gas assumption at high initial pressure based on the isentropic analysis. The ideal gas and the real gas equation of state results in the differences of Mach disk parameters at high initial pressures. The ideal gas assumption underestimates the Mach disk distance by 8% and overestimates the Mach disk diameter by 15% at the initial pressure of 50 MPa. The exit mass flow rates computed from the isentropic expansion assumption agree well with the numerical simulations. The results show that it is reasonable to evaluate mass flow rates of high-pressure hydrogen jets by the isentropic expansion assumption. |
| Keywords: | High-pressure hydrogen Real gas effect Isentropic analysis Exit parameter Mach disk |
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