STUDY ON GASEOUS DETONATION PROPAGATING THROUGH A PERFORATED STEEL PLATE SECTION

摘要

The paper presents an experimental investigation that attempts to understand the propagation of gaseous detonation waves in a tube section lined with a perforated steel plate. A stable cellular detonation was generated first in a tube with smooth inner walls, which propagated through a specially designed section lined with a perforated steel plate. Piezoelectric transducers mounted on the top of the section measured the pressure history and velocity of detonation for stoichiometric 2H_2 + O_2 premixed gas mixture. Results show that the detonation wave is attenuated first by the perforated plate then the pressure rises again. Our experimental results would support the following argument: The rough surface of absorbing materials", the perforated plate, wire mesh or steel wool etc. , can attenuate detonation wave by means of "absorbing" transverse waves. But, on the other hand, is also can cause immediate spontaneous transition to detonation, i.e. , spontaneous DDT (Deflagration to Detonation Transition). The mechanism that provides the immediate spontaneous transition to detonation for rough surface of "absorbing materials" is explored in the paper as well.