Temperature fields during the development of autoignition in a rapid compression machine

Using rapid compression machines for chemical kinetics studies

“…A somewhat similar behavior was observed for npentane combustion when the compressed temperature was at the lower end of the NTC range [31]. By contrast, at compressed temperatures close to the upper end of the NTC region, the reaction in the cooler zone developed faster and the temperature inhomogeneity inside the reaction chamber rapidly smoothed out [31]. Griffiths et al [32] further used chemiluminescence imaging together with filtered Rayleigh scattering in an RCM to characterize the transition from non-knocking to knocking reaction and the evolution of the spatial development of the reactivity.…”

“…The overall reaction of the former is characteristic of thermal ignition, while the combustion of the latter was investigated in the compressed temperature range exhibiting a 13 negative temperature dependence of the overall reaction rate. With imaging taken up to 10 ms after the end of compression, results showed that the di-tert-butyl peroxide reaction proceeded faster in the zone of peak temperature [31]. A somewhat similar behavior was observed for npentane combustion when the compressed temperature was at the lower end of the NTC range [31].…”

“…With imaging taken up to 10 ms after the end of compression, results showed that the di-tert-butyl peroxide reaction proceeded faster in the zone of peak temperature [31]. A somewhat similar behavior was observed for npentane combustion when the compressed temperature was at the lower end of the NTC range [31]. By contrast, at compressed temperatures close to the upper end of the NTC region, the reaction in the cooler zone developed faster and the temperature inhomogeneity inside the reaction chamber rapidly smoothed out [31].…”

“…In order to illustrate the interaction of chemistry with the temperature field in the RCM, Griffiths et al [31] contrasted the combustion behavior of di-tert-butyl peroxide with that of npentane. The overall reaction of the former is characteristic of thermal ignition, while the combustion of the latter was investigated in the compressed temperature range exhibiting a 13 negative temperature dependence of the overall reaction rate.…”

“…Griffiths et al [31] investigated temperature and concentration fields in a rapid compression machine by using a number of experimental techniques, including Schlieren photography, planar laser induced fluorescence (PLIF) of acetone, PLIF of formaldehyde, and chemiluminescence imaging. In order to illustrate the interaction of chemistry with the temperature field in the RCM, Griffiths et al [31] contrasted the combustion behavior of di-tert-butyl peroxide with that of npentane.…”