Self-ignition induced by cylindrically imploding shock adapting to a convergent channel.

A convergent channel method is applied to create an imploding arc shock as a partial representative of an overall cylindrical shock. The self-ignition phenomenon induced by such an imploding shock is investigated experimentally and numerically. Agreements between experimental and numerical results are widely reached not only for the shock imploding process but also for shock reflection and features of self-ignition, which approves the validity of the method. The induced self-ignition is found to lag behind the incident shock front and experience a shockless spontaneous process before the onset of detonation. The mechanisms are briefly addressed. [ABSTRACT FROM AUTHOR]