Detonation Limits in Gaseous Systems

Abstract

It is illustrated that one-dimensional Zeldovich–von Neumann–Doering model of detonation wave gives satisfactory approach for the description of a stationary detonation wave, despite a large number of the approximations made at the derivation of the equations of the theory. Besides, according to modern literary data on numerical modeling, the neglect of transverse structure of detonation wave in one-dimensional model has no influence on the pressure value in front of DW in comparison with multi-dimensional models. It is experimentally demonstrated that the acoustic resonator (Helmholtz’s resonator) connected to a cylindrical reactor can cause reactor destruction at spark initiation of deflagration in lean (15%) hydrogen mixture with oxygen. That points to a possibility of transition of deflagration to supersonic regime mode near the lower concentration limit of detonation even for small reactor where detonation is obviously impossible. On the basis of Zeldovich–von Neumann–Doering detonation theory with allowance for the theory of chain processes by the example of the oxidation of hydrogen-rich mixtures in the presence of chemically active additive (inhibitor), it is shown that taking into account reactions of inhibitor with chain carrier leads to “chemical” losses in addition to heat losses.