Temperature hysteresis in the unstable combustion mode of SHS: experiment with high-speed micro-pyrometry

The aim of this study is to report a new experimental regularity of the change in the propagation velocity of SHS as a function of the adiabatic temperature at the local point of the combustion front. The paper presents the results of measuring the temperature and velocity in the propagation of a combustion wave, obtained using a special television micro-pyrometer (1200×800 pixels) with high spatial (5.85 μm/pixel) and resolution time (1000 fps). High accuracy of temperature measurement was provided by using a new method of spectrally-bright pyrometry (patent RUS 2616937) from 800 to 2000°C with an error of less than 1%. This paper shows the experimental procedure and statistical data on the hysteretic dependence of velocity on temperature.