Hydrogen Jet Ignition Experiments and Modeling

Flame Ignition Limits: Ignitable Gas Envelope ConsiderationsThe ignitable gas envelope is importantto establishing separation distances forunintended releases of hydrogen.The extent of the ignitable gas envelopecan be based on several criteria. Which is best for Codes & Standardsdevelopment?For example:Time-averaged H2concentrationfield reveals extent of cloud withintraditional flammability limits (4%2LFLto 75%2RFL).Do traditional (static) flammabilitylimits provide a suitable measure ofignitability in turbulent flowingsystems?

CFD Analysis

CFD is a numerical method to solve the fluid governing equations that can not be solved in analytical form. By means of numerical simulations of potential accident scenarios, CFD can provide relevant data for risk assessment of hydrogen technologies (estimates of accident consequences e.g. pressure and thermal loads of hydrogen explosions and jet fires) CFD can provide a valuable contribution to the engineering design of safer hydrogen infrastructures and technologies


Deflagration and ExplosionIndustrial Accident Initial Conditions:Various H2-air mixture compositions (4%2- 75%2Various geometry environmentOpen geometry (external explosions): outside buildings, little influence of partial confinement and obstacles (in containment such as dome area)Partially confined: limitation in space, geometrical limitations (semi-open configurations; near wall, roof; etc)Confined explosions (internal explosions) inside rooms, compartments, pipes, etcVarious congestionHigh: high space blockage by pipework, cabling, repeating obstacles, etcMedium: intermediate level of

5th International Conference on Hydrogen Safety

Hydrogen - Potential role in the energy chainHelps integrating RES in the energy chain putting a value on excess production while reducing the need for subsidiesHelps balancing the electricity networksHelps the integrated and more cost effective operation of electricity and natural gas grids, thereforeReconciling renewables and fossil fuels in a new dynamic equilibriumCreating new opportunities for decarbonisation in transport sector (HCNG, SNG and FC cars)Provides for higher levels of EE (in micro-CHP, FC cars)

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