Numerical study on laminar flame velocity of hydrogen-air combustion under water spray effects |
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| Affiliation: | 1. University of Toronto, Toronto, ON M3H 5T6, Canada;2. CNRS, ICARE, Orléans 45072, France;1. Department of Energy, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid, Spain;2. Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA 92093-0411, USA;1. ONERA – The French Aerospace Lab., F-91761 Palaiseau, France;2. Central Aerohydrodynamic Institute (TsAGI), 140180 Zhukovsky, Moscow Region, Russia;3. Defense Security Systems Technology, The Swedish Defense Research Agency – FOI, SE 147 25 Tumba, Stockholm, Sweden;1. Department of Mechanical and Aerospace Engineering, Sapienza University of Rome, Italy;2. Gamma Technologies, Westmont, IL 60559, USA;3. Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA |
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| Abstract: | In the context of hydrogen safety and explosions in hydrogen-oxygen systems, numerical simulations of laminar, premixed, hydrogen/air flames propagating freely into a spray of liquid water are carried out. The effects on the flame velocity of hydrogen/air flames of droplet size, liquid-water volume fraction, and mixture composition are numerically investigated. In particular, an effective reduction of the flame velocity is shown to occur through the influence of water spray.To complement and extend the numerical results and the only scarcely available experimental results, a “Laminar Flame Velocity under Droplet Evaporation Model” (LVDEM) based on an energy balance of the overall spray-flame system is developed and proposed. It is shown that the estimation of laminar flame velocities obtained using the LVDEM model generally agrees well with the experimental and numerical data. |
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| Keywords: | Combustion Laminar flame velocity Water spray Hydrogen safety |
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