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Abstract
Magnesium has received significant attention as a potential hydro-reactive metal particle fuel due to its superior ignition and combustion characteristics. In this work, a laser ignition testing system was designed for visualised combustion monitoring of moving magnesium particles with different average diameters. Combustion images were recorded and the effect of particle diameter on the combustion phenomena and combustion time were analysed. The statistical results show that the average combustion times are 4.5 ± 2.5, 15.2 ± 7.9, and 31.7 ± 17.9 ms for the magnesium particle fractions of 100, 150, and 200 µm, respectively. Moreover, a quasi-stable state, heterogeneous, and diffusion limited mathematical model was developed to describe the combustion process. In the model, a flame surface exists and divides the gas phase field between the particle surface and infinity into an internal zone and an external zone. Effects of particle relative movement on the heat transfer and external zone components were also considered.
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No potential conflict of interest was reported by the author(s).
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Notes on contributors
Daolun Liang
Daolun Liang is an Associate Professor in the Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment at Southeast University, China. He received his PhD in Engineering Thermophysics from the State Key Laboratory of Clean Energy Utilization at Zhejiang University in 2018. His research interests include combustion theory and advanced manufacture of energetic materials, storage and utilization of hydrogen energy.
Tianhua Xue
Tianhua Xue is a graduate student of Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment at Southeast University. Her research focuses on the ignition and combustion characteristics of boron-containing nano slurry droplets.
Weidong Zhong
Weidong Zhong is a former student of Southeast University where he completed the MEng in Power Engineering. His research focused on analyzing different combustion modes of discrete metal particles and revealing their ignition and combustion behaviors in the state of motion.
Wen Ao
Wen Ao is now an Associate Professor in School of Astronautics, Northwestern Polytechnical University, China. He received his PhD in Engineering Thermophysics from Zhejiang University in 2014. His research interests include solid propellant combustion, combustion instability, metallic fuel combustion, etc. He presided and participated in over 10 national scientific research projects.
Ke Ren
Ke Ren is a former student of Southeast University where she completed her bachelor's degree in Energy and Power Engineering with Honors. Her research during her bachelor's degree focused on the preparation of nanofluidic fuels and gas-solid reaction models. She is currently studying in Taiyuan University of Technology and her research focused on waste management and ash utilization.
Yangxu Jiang
Yangxu Jiang is a former student of Southeast University where she completed her bachelor's degree in Energy and Power Engineering with Honors. During her undergraduate years, her research focused on theories and methods of combustion of single magnesium particles.
Yang Wang
Yang Wang is a researcher at the School of Energy and Electricity, Hohai University. Mainly engaged in scientific research on the internet of things, smart energy, solar thermal, thermal storage materials, solid fuels, micro-scale, high humidity and other extreme environment combustion.
Dekui Shen
Dekui Shen is a Professor in the Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment at Southeast University. He obtained a B.E. degree with a double major in thermal dynamic engineering and communication technology at Zhejiang University in 2003. He obtained his PhD degree in thermo-physics from the State Key Laboratory of Clean Energy Utilization at Zhejiang University in 2008. His research interests include thermo-chemical conversion of biomass into fuels, chemicals and carbon nanomaterials, molecular dynamics simulations of thermo-chemical processes and environmental pollution control.