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LH2 BLEVE modelling activityPRESLHY Dissemination Conference
Federico Ustolin
05.05.2021
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1. BMW safety tests
2. Methodology
3. Results
4. Blind prediction study of the SH2IFT experiments
5. Future works
Outline
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1 - BMW safety tests
Bursting tank scenario tests
➢ The LH2 tank of the BMW Hydrogencar was analysed
➢ Ten vessels (120 litre) were tested
➢ Tanks were wrecked by means ofcutting charges.
[Pehr, K., 1996. Aspects of safety and acceptance of LH2 tanksystems in passenger cars. Int. J. Hydrogen Energy 21, 387–395]
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1 - BMW safety testsUncertainties
➢ The exact amount of LH2 during each test is not known (1.8 ÷ 5.4 kg).
➢ Only the inner vessel was tested
➢ Exact position of the measurement points is unknown
➢ A proper fragments analysis was not provided (max. fragment range 15 m)
➢ Only maximum fireball diameter (20 m) and duration (4 s) were reported
➢ Fireball radiation measurements were not published
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1 - BMW safety tests (overpressure)
[Pehr, K., 1996. Aspects of safety and acceptance of LH2 tank systems in passenger cars. Int. J. Hydrogen Energy 21, 387–395]
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Methodology
Analytical models & empirical correlations were employed in the analysis
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Results - Overpressure
Ideal gas behaviour models do not work properly close to the critical pressure
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Results - Overpressure and impulse
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Results - Fragments and fireball
FragmentsFireball
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Results - Overpressure (SH2IFT)
V = 1 m3
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Results - Fragments and fireball (SH2IFT)Fragments
Fireball
➢ Further validation of the model is needed
➢ Thermal radiation measurements for LH2
fireball (small- mid-scale) were not found
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Current activity and future studiesUnder review
➢ CFD analysis of the BLEVE by using ADREA-HF in collaboration with NCSR“Demokritos”(BMW tests)
➢ Thermal node model to estimate the time to failure of a liquefied gasvessel exposed to a fire
Current activities
➢ CFD analysis of the LH2 tank lading when exposed to a fire
➢ Implementation of the combustion effect in future models
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Thank you for your attention
https://www.sintef.no/projectweb/sh2ift/
Project coordinator (Sintef):Anders Ødegård: Anders.Odegard@sintef.no
WP 4 researchers:Federico Ustolin: federico.ustolin@ntnu.no Nicola Paltrinieri: nicola.paltrinieri@ntnu.no
WP 4 (LH2 modelling) leader:Lars Odsæter: lars.odsater@sintef.no
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