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Extinction condition of counterflow spray diffusion flame with polydisperse water spray |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Brawijaya, Veteran Street, Malang, East Java 65145, Indonesia;2. Department of Mechanical Engineering, Yamaguchi University, Ube, Yamaguchi 755-8611, Japan;1. Department of Management and Conservation of Ecclesiastical Cultural Heritage Objects, University Ecclesiastical Academy of Thessaloniki, N. Plastira 65, Thessaloniki 54250, Greece;2. Lab of Mechanics and Materials, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece;3. Departrment of Civil Engineering, University of Arizona, Tucson, AZ 85781, USA;4. Modern Functional Materials Chair, ITMO University, St. Petersburg 191002, Russia;1. Research Institute of Intelligent Control and Systems, Harbin Institute of Technology, Harbin 150001, China;2. College of Mathematics and Physics, Bohai University, Jinzhou 121013, Liaoning, China;3. College of Information Science and Technology, Bohai University, Jinzhou 121013, China;1. University of North Alabama, Florence, AL, USA;2. Middle Tennessee State University, Murfreesboro, TN, USA;1. Department of Mathematics, Columbia University, New York, NY 10027, United States;2. Department of Mathematics, Rutgers, The State University of New Jersey, 110 Frelinghuysen Road, Piscataway, NJ 08854-8019, United States;1. Department of physics, Azarbaijan Shahid Madani University, Tabriz, Iran;2. Azarbaijan Shahid Madani University, Campus Tabriz, Tabriz, Iran |
| Abstract: | The effect of polydisperse water droplet size distribution on the burning behavior and extinction condition of counterflow spray diffusion flame was investigated experimentally in this study. N-heptane as liquid fuel spray and nitrogen as a carrier gas were introduced from the lower duct while water spray and oxidizer consisting of oxygen and nitrogen was issued from the upper duct. The burning behavior of spray flame for different fuel droplet size with and without water spray was observed and the extinction condition of counterflow spray diffusion flame was characterized by oxygen concentration at extinction. The results show that the minimum value of oxygen concentration at extinction for counterflow spray diffusion flame with water spray is similar to the extinction condition without water spray for higher mean droplet diameter of water. The minimum value of oxygen concentration at extinction shifts to the smaller fuel droplet size when decreasing the water droplet size. For fuel droplet size higher than 48 μm, the optimum of water droplet size for suppressing counterflow spray diffusion flame was smaller than gaseous flame. The explanation of optimum water droplet size based on the coupled effect of Stokes number and vaporization Damköhler number can be used for prediction of the effectiveness of water droplet on the suppression of counterflow spray diffusion flame. |
| Keywords: | Counterflow spray diffusion flame Water spray Extinction condition Polydisperse spray |
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