Energy attenuation behavior on propane–air premixed combustion on account of nonmetallic spherical spacers in confined space with two perforated plates

Abstract

Energy attenuation behavior on propane premixed combustion on account of nonmetallic spherical spacers (NSSs) was investigated in a constant volume combustion bomb with two accelerative perforated plates. The flame evolution process is captured by a photography device with schlieren. Energy attenuation effects of NSSs were explored on flame propagation, overpressures, and pressure oscillation. Normal combustion accomplished with flame acceleration, jet autoignition, deflagration, and weak detonation is observed, respectively. NSSs show a good energy attenuation effect on propane normal combustion, jet autoignition, and deflagration evolution behavior, however, during the evolution of weak detonation, the attenuation effect is relatively weak. The mean velocities difference, as well as explosion overpressure decay rate caused by NSSs, decreases from (45.70 m/s and 26.48%) to (2.70 m/s and 18.15%) when the initial pressure increases from 0.1 to 0.5 MPa, namely, attenuation effect of NSSs on propane explosion decreases with increasing initial pressure.

Research on Multi-Objective Optimization on Explosion-Suppression Structure-Nonmetallic Spherical Spacers

“…Weak detonation occurs under these conditions [16]. In our work [14], the filling density of NSSs is 21.9 kg/m 3 , and its energy attenuation effect is relatively weak. In this work, the same experimental apparatus and procedures are employed to verify the explosion suppression effect of the optimized NSSs.…”

“…The spacers of NSSs undergo significant deformation and can even be severely damaged under the impact of a quasi-detonation flame [14]. Spacers in NSSs resisted deformation and absorbed energy, thus suppressing flame evolution [29].…”

“…Although flame propagation was not completely prevented, NSSs shortened the flame duration and reduced the flame intensity. Our work [14] researched the energy attenuation behavior of propane-air premixed combustion on account of NSSs in a confined space with two perforated plates. NSSs show a good energy attenuation effect on propane normal combustion, jet autoignition, and deflagration evolution behavior; however, during the evolution of weak detonation, the attenuation effect is relatively weak.…”