Abstract
In order to examine the performance of the apparatus of a shock tube connected to a quadrupole mass spectrometer, the temporal variation of the O2 concentration in the oxidation of H2 was studied over the temperature range of 1300 — 2000 K, and the relationships between the induction period and reciprocal temperature were determined. The induction period and the temporal variation observed with O2 were compared with those calculated theoretically. The temperature of the gas molecules sampled under our experimental condition was found to be slightly lower than that calculated from the incident shock velocity. The cooling of the sample gas molecules by the boundary layer at the end wall of the shock tube was found to have little effect on the time history curves for O2 up to about 1 msec after heating by reflected shock waves.
