Electric probe measurements of chemical ionization behindreflected shock wavesстатья
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Дата последнего поиска статьи во внешних источниках: 7 июля 2021 г.
Аннотация:Chemical ionization is the process of formation of charged particles as a result ofenergy release during the formation of chemical bonds in chemical reactions between neutralcomponents. Chemical ionization is most often observed in the processes of hydrocarboncombustion. Measurements of ionization current in internal combustion engines are of greatpractical interest. Most experiments on chemical ionization were carried out in flames withobvious limitations: the composition of the mixture cannot be changed in an arbitrarily widerange of concentrations of fuel and oxidant, to investigate the pyrolysis processes, to arbitrarilychange the temperature and pressure, it is impossible to dispose of the transfer processes andgradients of temperature and reactive components. Experiments in shock tubes in the reflectedshock waves are free of all of the above disadvantages. In the present work, electric currents tothe electrically insulated and uninsulated cylindrical probes were recorded, to which a negative(−9V) or positive (+9V) potentials were applied. In these experiments, the displacement andthe total currents were recorded respectively. In the same experiments, the signals ofchemiluminescent emission of electronically excited OH* radicals ( = 308 nm) weresimultaneously recorded. The main goal of the present work was to measure experimentally (1)the displacement currents on positive and negative probes, (2) the total and displacementcurrents on a negative cylindrical probe during acetylene pyrolysis and oxidation, and (3) toconfirm correlation of the displacement currents and the signals of chemiluminescent emissionof electronically excited OH* radicals.