Multi-factor influencing on detonation quenching performance of hydrogen crimped-ribbon flame arrester

Abstract

By self-designed experimental apparatus, the influences of initial condition, the structure parameters of flame arrester (FA) and expansion chamber (EC) on hydrogen detonation quenching performance of crimped-ribbon flame arrester are investigated. The effects of different factors on the detonation velocity (Vf) and pressure (Pf) accessing FA, the attenuation extent and the quenching results are determined. The experimental results present that the Vf and Pf exhibit a tendency to increase and then decrease as the hydrogen concentration increases. Both Vf and Pf are raised by enhancing initial pressure and ignition energy, and the attenuation effect of FA is gradually weakened. Meanwhile, the detonation intensity applied to the flame arrester element (FA-E) is reduced due to the attenuation effect of the EC, thus leading to flame being more easily quenched. The baffle and extended type ECs are more effective than the conventional type EC in reducing the detonation velocity, and the quenching performance of extended type EC is better. Then, the reduction of porosity and the rise of element thickness effectively enhance the wall heat transfer and boundary layer effects, resulting in the increasing of velocity deficit and the quenching of detonation. Furthermore, the multi-factor prediction models for Vf and Pf under the action of the initial conditions are built by the response surface method (RSM). The influence extent of factors and their interaction on Vf and Pf are also analyzed and confirmed.