Prechamber initiation of detonation in gaseous mixtures

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Bivol, G.Yu.^1 ; Golovastov, S.V.^1 ; Golub, V.V.^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13, Moscow

125412, Russia^1

关键词: Circular cross-sections;    Deflagration to detonation transition;    Detonation initiation;    Direct initiations;    Equivalence ratios;    Initiation of detonations;    Piezoelectric pressure;    Pressure profiles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012064/pdf
DOI  :  10.1088/1742-6596/653/1/012064

来源: IOP

【 摘 要 】

A process of deflagration-to-detonation transition in propane-butane-oxygen and acetylene-oxygen mixtures, in an open channel with a circular cross section with a diameter of 3 mm, was investigated experimentally. Detonation initiation was carried out by burning the mixture in the prechamber connected to the channel. The prechamber was considered as an extended source for the initiation of the detonation of a finite volume. To measure the velocity of a flame front, photodiodes, installed along the axis of the channel, were used. To determine the boundary conditions at the entrance to the channel, a piezoelectric pressure transducer was used. The influence of the dimensions of the prechamber, equivalence ratio and fuel on the pressure profile, and evolution of the flame front along the axis of the channel are presented. It was shown that, the dynamics of the flame front and shock waves in the channel can occur in different scenarios depending on the geometry of the prechamber and equivalence ratio. Two limit effects of the prechamber detonation initiation in the channel have been analyzed. The pre-detonation distances and the minimal energy of direct initiation of the detonation were determined.