Abstract
The nonequilibrium radiation in the spectral range of 210-415 nm at ignition of a 10% stoichiometric hydrogen-oxygen mixture with additives of combustion inhibitors diluted with argon behind shock waves was registered. The detected chemiluminescence is presumably attributed to electronically excited H2O* and H2O2 *. Instead of the expected quenching of excited radicals and molecules in the ignition zone, with the addition of halogenated hydrocarbons inhibitors, the increase of radiation, particularly in the range of 330-415 nm, was observed. The possible reasons of this phenomenon are discussed.
Highlights
The goal of this work is to analyse the effect of halogen-containing combustion inhibitors (CCl4, C2F4Br2) addition, which effect on hydrogen ignition was previously studied in detail by the authors [5, 6], as well as inert CO2 addition, on the level of nonequilibrium UV radiation in spectral range from 210 up to 415 nm at ignition of
The ignition behind the reflected shock wave was detected with the use of piezoelectric pressure sensors, as well as nonequilibrium radiation was detected with a photomultiplier, at 310±5 nm
In the region of 411 nm, on the contrary, there is a significant increase in nonequilibrium emission
Summary
The ignition behind the reflected shock wave was detected with the use of piezoelectric pressure sensors, as well as nonequilibrium radiation was detected with a photomultiplier, at 310±5 nm (which corresponds to the electronic transition of the OH * radical). Spectral emission at wavelengths from 210 up to 415 nm was measured with the help of an Acton Research Cooperation SpectraPro 150 diffraction monochromator and photomultiplier Hamamatsu H6780-04 with spectral resolution of ±4 nm. The investigated spectral range is characteristic for the emission of electronically excited radicals and molecules HO2*, H2O*, H2O2* [10, 11]. The parameters of the mixtures studied, as well as the ranges of temperatures and pressures behind the reflected shock waves, are given in the table 1
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