Explosion hazard of hydrogen–air mixtures in the large volumes

The report deals with the investigation of non-stationary combustion of hydrogen–air mixtures extremely relevant to the issues of safety. Considered are the conditions of its formation and development in the tubes, in the conic element and in the spherical 12-m diameter chamber. The report shows that at the formation of non-stationary combustion in the conic element, in its top the pressure can develop exceeding 100 MPa. It is also shown that in large closed volumes non-stationary combustion can develop from a small energy source, in contrast to detonation for its stimulation in large volumes of significant power influences are required. Simultaneously, in the large closed volume a pressure can be formed by far exceeding the Chapman–Jouguet pressure in the front of stationary detonation.