Introduction of Technology for Assessment on Hydrogen Safety

In investigating hydrogen safety, estimation of the dispersion concentration range upon leakage, and that of flame formation and any blast wave pressure upon ignition are important. Thus, in accordance with 2 typical accident scenarios at a hydrogen refueling station (steady pinhole leakage from micro cracks in piping, etc., and unsteady, large-scale leakage such as breaking of piping, etc.), investigations relating to dispersion and explosion behaviors of hydrogen gas were carried out through field experiments together with numerical simulations. The field experiments were carried out at Tashiro Testing Facility in Akita Prefecture (the rocket combustion test facility) where a number of satisfactory results have been achieved in MHI's rocket development. Through these experiments, the useful data shown below were obtained, and using the experimental data, development of numerical simulations