COEFFICIENTS OF HYDROGEN COMBUSTION AND EXPLOSION IN CASE OF LAMINAR AND TURBULENT CONVECTION ON A HORIZONTAL PLATE

A model task of propagation of hydrogen in air at laminar or turbulent convection on a horizontal surface through which hydrogen accumulates at her blowing a stream of air is considered. This case is equivalent to a wind or blowing fan over evaporating surface of liquid hydrogen or exposed surface of the container with hydrogen gas (for example, hydrogen hydride battery) with equal pressure inside the outer. A mathematical model for calculating the concentration distribution of hydrogen over the cross section of the boundary layer is proposed. Analytical formulas for determining the proportion of the mass flow rate of hydrogen that come on flammable and explosive hydrogen-air mixtures are obtained. It is found that 37 % of the mass of hydrogen entering the air are flammable hydrogen-air mixture, and 18 % — an explosive mixture in the case of the laminar boundary layer and 63 % of the mass of hydrogen forms an ignitable a hydrogen-air mixture, and 31 % — an explosive mixture during turbulent regime. For a more accurate estimate of the coefficient of participation in the burning and the explosion of hydrogen it is necessary to consider the three-dimensional non-stationary convection that occurs when the leakage of hydrogen into space takes place.