文档介绍：VALIDATION OF CFD MODELLING OF LH2 SPREAD AND
EVAPORATION AGAINST LARGE-SCALE SPILL EXPERIMENTS
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Prankul Middha , Mathieu Ichard, Bjørn J. Arntzen
GexCon AS, . Box 6015, NO-5892 Bergen, Norway
ABSTRACT
Hydrogen is widely recognized as an attractive energy carrier due to its low-level air pollution and its
high mass-related energy density. However, its wide flammability range and high burning velocity
present a potentially significant hazard. A significant fraction of hydrogen is stored and transported as
a cryogenic liquid. Therefore, loss of hydrogen containments may lead to the formation of a pool on
the ground. In general, very large spills will give a pool, whereas moderate sized spills may evaporate
immediately. Accurate hazard assessments of storage systems require a proper prediction of the liquid
hydrogen pool evaporation and spreading.
A new pool model handling the spread and the evaporation of liquid spills on different surfaces has
recently been developed in the putational Fluid Dynamics (CFD) tool FLACS [1-4]. As the
influence of geometry on the liquid spread is taken into account in the new pool model, realistic
industrial scenarios can be investigated. The model has been validated for LNG spills on water with
the Burro and Coyote experiments [5,6]. The model has previously been tested for LH2 release in the
framework of the EU-work of Excellence HySafe where experiments carried out by
BAM were modelled. In the large scale BAM experiments [7], 280 kg of liquid hydrogen was spilled
in 6 tests adjacent to buildings. In these tests, the pool spreading, the evaporation, and the cloud
formation were investigated. Simulations of these tests are found pare reasonably well with the
experimental results.
In the present work, the model is extended and the liquid hydrogen spill experiments carried out by
NASA are simulated with the new pool model. The large scale NASA experiments [8,9] consiste