Effect of an orifice plate on the explosion behaviors of H2-N2O mixtures

The explosion characteristics of H2-N2O over a wide range of equivalence ratio (4) at a reduced pressure were studied experimentally in a cylindrical explosion vessel. Two orifice plates with the blockage ratios of 0.4 and 0.6 were employed to characterize the influence of an obstacle on the explosion behaviors. The experimental results showed that maximum explosion pressure could be higher than the adiabatic value due to the potential of flame acceleration and deflagration to detonation transition (DDT). The maximum explosion pressure was increased by the orifice plate at the fuel-lean side due to the flame instability while decreased at the fuel-rich side. This means that the roles played by the orifice plate are different for affecting the maximum pressure. The maximum pressure rise rate ((dp/dt)max) was increased by introduction of an orifice plate due to the turbulencegenerator effect. The maximum (dp/dt)max was obtained at 4 = 0.6, indicating that the flame instability rather than the adiabatic explosion pressure or laminar burning velocity plays a leading role. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This study experimentally investigated the explosion characteristics of H2-N2O mixture under different equivalence ratios and found that the introduction of orifice plates had different effects on the maximum explosion pressure and pressure rise rate under different combustion conditions.