Parameters of thermal radiation of a hydrogen flame

High attention is now devoted to a fire safety of objects with a presence of hydrogen due to a rapid development of a hydrogen energetics. An evaluation of a risk for the objects of hydrogen energetics is one of the key tasks for a such development. A decision of this task requires an information on a radiation intensity of hydrogen flames. But this information published in literature is often non-complete and sometimes contradictive. Therefore this study is aimed on a review of literature sources published in Russian and international journals. The main value required for the fire risk evaluation is a surface radiation intensity of hydrogen flames. In this study four types of the flames were considered: gaseous jet flame; jet flame of liquid hydrogen; pool fire of liquid hydrogen; fireball. It was noted that surface thermal radiation intensity of the hydrogen flames is remarkably lower in comparison with hydrocarbon flames. The surface thermal radiation intensity Ef of a hydrogen gaseous jet flame cfn be accepted to be equal 33 kW/m2 in the fire risk calculations. The Ef value for the hydrogen fireball can be accepted to be equal 330 kW/m2. The surface thermal radiation intensity for combustion of liquid hydrogen (both for the jet flame and the pool fire) can be accepted to be equal 80 kW/m2.