The kinetic characteristic features of the low temperature hydrogen oxidation during the induction period behind reflected shock waves

31st International Conference on Equations of State for Matter

Agafonov, G.L.^1 ; Garmash, A.A.^2 ; Medvedev, S.P.^1 ; Seletkova, A.V.^2 ; Smirnov, V.N.^1 ; Shumova, V.V.^1,3 ; Tereza, A.M.^1 ; Vlasov, P.A.^1,2

Semenov Institute of Chemical Physics, Russian Academy of Sciences, Kosygina 4, Moscow

119991, Russia^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe Shosse 31, Moscow

115409, Russia^2

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13, Moscow

125412, Russia^3

关键词: Auto-ignition process;    Hydrogen oxidation;    Ignition delay time;    Ignition induction;    Initial temperatures;    Kinetic characteristics;    Physico-chemical factors;    Reflected shock waves;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/774/1/012081/pdf
DOI  :  10.1088/1742-6596/774/1/012081

来源: IOP

【 摘 要 】

The experiments on the ignition of H2-O2mixtures behind reflected shock waves were carried out. In these experiments the chemiluminescence of electronically excited OH∗ radicals (λ = 308 nm) at the early stage of the ignition induction period is studied over the temperature range of 800 ∗radicals was experimentally observed. The experiments showed that the onset of OH∗emission is always ahead of the time of pressure rise. Any regular dependence between the onset of OH∗emission and the initial temperature behind the reflected shock wave T50is not observed. This is indicative of a stochastic character of this process or hotspot ignition of the reactive mixture.