Main Catalog Physics Chemical physics, combustion and explosion

Finding the combustion limits of a gas suspension based on hydrogen with water microdroplets

Authors: Lobov K.S.
Published in issue: #8(61)/2021
DOI: 10.18698/2541-8009-2021-8-726
Category: Physics \| Chapter: Chemical physics, combustion and explosion
Keywords: combustion of a depleted hydrogen-air mixture, water droplets, combustion in a channel, combustion in a flow reactor, combustion limits, fire safety, continuous two-speed two-temperature model, numerical simulation
Published: 26.08.2021

The study of flame propagation in a depleted hydrogen-air mixture with water droplets was carried out using the methods of numerical simulation. It is especially important for fire safety applications, in particular, for the storage and transportation of hydrogen and nuclear power. Two cases are considered: flame propagation in a channel filled with a premixed hydrogen-air mixture with initially immobile water droplets, and combustion of a gas-droplet suspension during its directed supply to the reaction zone in a flow reactor. The combustion limits are determined for each case. It was found that small-diameter water droplets make it possible to extinguish the flame more efficiently, and also that large-diameter droplets at certain concentrations contribute to the rapid cooling of the reaction products. It has been established that with a directed supply of a gas-droplet mixture to the reaction zone, fire extinguishing is observed at a lower mass concentration of droplets than in the case of flame propagation in a channel with stationary suspended droplets.

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