Inhibition of stationary detonation waves in hydrogen-air mixtures

Influence of Hydrocarbon Additives on the Velocity of Detonation Wave and Detonation Limits in Lean Mixes by the Example of The Reaction of Hydrogen Oxidation

“…As is also seen in Fig.2, the RH additives, which demonstrate a strong inhibiting action in stoichiometric and rich H2 -air mixtures [11] are effective promoters in lean H2 -air mixtures.…”

“…The detonation passed into a wider section where the detonation wave in the mix under investigation was formed. At certain concentrations of inhibitor, the detonation wave broke down to a shock wave and the combustion front that lagged behind a shock wave as it was earlier revealed in Azatyan, et al [11]. As the limit concentration of inhibitor, we considered that one, at which the detonation wave occurred, but at small excess of this concentration, the detonation wave broke down.…”

“…As the experiment [11] shows the existence of a detonation limit on RH concentration, it is necessary to consider initially the propagation of a detonation wave with losses [3,13].…”

“…Experiments were performed in a detonation tube [11] which consisted of four sections 14, 16, 64 and 83 mm in diameter connected with gradual diameter tapers. Previously prepared combustible mixes were maintained for several days for uniform hashing.…”

Initiation of chain and thermal explosions by the reactor surface. Criterion for the participation of branching chains in a thermal explosion

“…These varied "constants," except for k 0 from [15][16][17][18][19], were one to four orders of magnitude larger than the gas-phase reaction rate constants measured by the shock wave method without the influence of the surface [11]. Thus, for example, in [4,10], the ignition of an oxyhydrogen gas was described quantitatively using the "heterogeneous constant" k 0 = 0.7 · 10 −18 cm 3 /(molecule · sec), which was four orders magnitude larger than the "gas-phase constant" k 0 ≈ 10 −22 cm 3 /(molecule · sec).…”