This thesis offers important new insights into and a deeper understanding of premixed flame instabilities and hydrogen safety. Further, it explains the underlying mechanisms that control the combustion processes in tubes. The author’s previous scientific accomplishments, which include a series of high-quality publications in the best journals in our field,Combustion and Flame and International Journal of Heat and Mass Transfer, are very impressive and have already made a significant contribution to combustion science.
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1 Background and Introduction |
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1.2 Accomplishments and Present Research Status |
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1.2.2 Research of Dynamics and Mechanisms of Premixed Flame Propagation in Tubes |
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1.2.3 Research of Combustion and Explosion Safety in Utilization of Hydrogen Energy |
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1.3 Scientific Issues and Research Objectives of the Thesis |
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1.4 Research Content and Organization of the Thesis |
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2 Experiments of Premixed Hydrogen-Air Flame Propagation in Ducts |
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2.2 Experimental Setup and Methods |
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2.2.2 Gas Mixture Preparation and Filling System |
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2.2.3 High-Voltage Ignition System |
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2.2.4 High-Speed Photography System |
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2.2.5 Schlieren Optics System |
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2.2.6 Pressure Transducer |
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2.2.7 Data Acquisition Device |
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2.2.8 Synchronization System |
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2.3 Experiment Procedure and Initial Conditions |
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2.4 Experimental Results and Discussion |
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2.4.1 Hydrogen--Air Flame Propagation in Half-Open Tubes |
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2.4.2 Hydrogen--Air Flame Propagation in Closed Tubes |
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2.4.3 Behaviors and Characteristics of Distorted Tulip Flames |
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2.4.4 Comparisons of Distorted Tulip Flame to Classical Tulip Flame |
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2.4.6 Effects of Equivalence Ratio |
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2.4.7 Effects of Opening Ratio |
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3 Numerical Simulations of Dynamics of Premixed Hydrogen-Air Flames Propagating in Ducts |
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3.2.2 Mathematical Model and Governing Equations |
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3.2.3 Combustion Modeling |
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3.3 Numerical Results and Discussion |
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3.3.1 Results Based on Thickened Flame Technique and Comparisons to Experiments |
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3.3.2 LES Calculations Using Burning Velocity Model and Comparisons to Experiments |
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4 Theoretical Analysis of Premixed Hydrogen--Air Flame Propagation in Ducts |
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4.2 Evolution of Premixed Flame in a Duct |
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4.3 Factors Influencing the Flame Properties |
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4.3.1 Influence of Fuel Properties |
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4.3.2 Influence of Mixture Composition |
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4.3.3 Influence of Pressure and Temperature |
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4.3.4 Influence of Impurities |
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4.3.5 Influence of Ignition Energy |
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4.4 Theoretical Analysis of Premixed Hydrogen--Air Flame in the Duct |
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4.4.2 Theoretical Model and Results |
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4.5 Comparisons Between Experiments, Numerical Simulations and Theoretical Predictions, and the Combustion Regime |
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4.6 Effects of Wall Friction |
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5 Mechanisms of Flame Deformations in the Premixed Hydrogen--Air Flame Propagation |
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5.2 Interactions Between Flame and Pressure Waves |
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5.3 Formation Mechanism of Tulip Flame ---Interactions of Flame with Flow |
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5.4 Formation Mechanisms of Distorted Tulip Flames---Interactions Between Flame, Pressure Waves, and Flow |
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5.4.1 Interactions of Flame Front with the Vortex Motion in Burnt Gas |
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5.4.2 Taylor Instabilities |
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6 Conclusions and Further Work |
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| Reference |
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Huahua Xiao
Degree: B.Eng. Department of Safety Engineering, Safety Engineering, China University of Mining and Technology (2007)
Prizes and awards: Best PhD Thesis Award, Chinese Academy of Science (2014); Chinese Academy of Sciences Dean Award, Chinese Academy of Science (2012); National Scholarship for Postgraduate students, Ministry of Education of P.R. China (2012); Nongmei Award, University of Science and Technology of China (2011); National Fellowship, China Scholarship Council (2010); Feijian Award, University of Science and Technology of China (2010).
Publications: [ 1]Huahua Xiao, Xuechao He, Qiangling Duan, Xisheng Luo, Jinhua Sun. An investigation of premixed flame propagation in a closed combustion duct with a 90°bend. Applied Energy, 2014, 134: 248-256. [ 2]Huahua Xiao, Zhanli Mao, Weiguang An, Jinhua Sun. Experimental and LES investigation of flame propagation in a hydrogen/air mixture in a combustion vessel. Chinese Science Bulletin, 2014, 59(20): 2496-2504. [ 3]Huahua Xiao, Qingsong Wang, Xiaobo Shen, Weiguang An, Qiangling Duan, Jinhua Sun. An experimental study of premixed hydrogen/air flame propagation in a partially open duct. International Journal of Hydrogen Energy, 2014, 39(11): 62336241. [ 4]Huahua Xiao, Xuechao He, Qingsong Wang, Jinhua Sun. Experimental and numerical study of premixed flame propagation in a closed duct with a 90° curved section. International Journal of Heat and Mass Transfer, 2013, 66: 818822. [ 5]Huahua Xiao, Weiguang An, Qiangling Duan, Jinhua Sun. Dynamics of premixed hydrogen/air flame in a closed combustion vessel. International Journal of Hydrogen Energy, 2013, 38(29, 30): 1285612864. [ 6]Huahua Xiao, Dmitriy Makarov, Jinhua Sun, Vladimir Molkov. Experimental and numerical investigation of premixed flame propagation with distorted tulip shape in a closed duct. Combustion and Flame, 2012, 159(4): 1523-1538.
[ 7]Huahua Xiao, Qingsong Wang, Xiaobo Shen, Song Guo, Jinhua Sun. An experimental study of distorted tulip flame formation in a closed duct. Combustion and Flame, 2013, 160(9): 1725-1728. [ 8]Huahua Xiao, Xiaobo Shen, Huahua Xiao, Jinhua Sun. Experimental study and three-dimensional simulation of premixed hydrogen/air flame propagation in a closed duct, International Journal of Hydrogen Energy, 2012, 37(15): 11466-11473. [ 9]Huahua Xiao, Qingsong Wang, Xuechao He, Jinhua Sun. Experimental study on the behaviors and shape changes of premixed hydrogen-air flames propagating in horizontal duct, International Journal of Hydrogen Energy, 2011, 36(10): 6325-6336. [ 10]Huahua Xiao, Jinhua Sun Xeuchao He, Liying Yao. Experimental and numerical study on premixed hydrogen/air flame propagation in a horizontal rectangular closed duct, International Journal of Hydrogen Energy, 2010, 35(3):1367-1376. [ 11]Lin Jiang, Huahua Xiao, Weiguang An, Yang Zhou, Jinhua Sun. Correlation study between flammability and the width of organicthermal insulationmaterials for building exterior walls. Energy and Buildings, 2014, 82: 243249. [ 12]Xuejuan Zhao, Huahua Xiao, Qingsong Wang*, Ping Ping, Jinhua Sun. Study on spontaneous combustion risk of cotton using a micro-calorimeter technique. Industrial Crops and Products, 2013, 50: 383-390. [ 13]Lingling Jiao, Huahua Xiao, Qingsong Wang, Jinhua Sun*. Thermal degradation characteristics of rigid polyurethane foam and the volatile products analysis with TG-FTIR-MS. Polymer Degradation and Stability, 2013, 98(12): 26872696. [ 14]Xuejuan Zhao, Qingsong Wang, Huahua Xiao, Zhanli Mao, Peng Chen, Jinhua Sun. Prediction of coal stockpile auto ignition delay time using micro-calorimeter technique. Fuel Processing Technology, 2013, 110: 86-93. [ 15]Qingsong Wang, Yu Wang, Haodong Chen, Huahua Xiao, Jinhua Sun*, Linghui He. Frame constraint effect on the window glass crack behavior exposed to a fire. Engineering Fracture Mechanics, 2013, 108: 109-119. [ 16]Xiaobo Shen, Qingsong Wang, Huahua Xiao, Jinhua Sun*, Experimental study on the characteristic stages of premixed hydrogen-air flame propagation in a horizontal rectangular closed duct. International Journal of Hydrogen Energy, 2012, 37(16): 12028-12038.
