PRESLHY_D4.8 report 4th Dec

PRESLHY_D4.8 report 4th Dec

This report includes results from experiments and analyses on condensed phase materials and phenomena involved in the release of liquid hydrogen. The objective is to understand the potential risks from explosive events that may arise in ways other than confined or congested gas phase combustion.
Such risks might include condensed phase explosions and Rapid Phase Transitions (RPTs).
The report is divided into three parts:
Part 1: Interaction between pools of accumulated liquid hydrogen and water sprays and jets
This experimental work investigates whether Rapid Phase Transitions and associated pressure effects are to be expected if water from sprinklers or monitors is used to limit the spread of liquid hydrogen.
Part 2: Solids deposited during releases of liquid hydrogen
This is an analytical and modelling study of the condensation and freezing of air when mixed into a liquid hydrogen jet – focussing on the potential for oxygen enrichment. The results are based on a previous experimental study of solid accumulation during liquid hydrogen releases. The report also includes an appendix with a detailed analysis of mass flow results from PRESLHY. These allow a quantitative understanding of the previous experimental work on deposition (where the hydrogen flow rate was uncertain).
Part 3: Behaviour of condensed phases after ignition
The analysis of condensed phase solid deposits and ongoing LH2 flow is extended to include the effect of ignition and the ensuing fire. The purpose of this work is to understand the nature of a violent explosive event that was observed in a previous ignited ground-level jet

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