Article
Energy & Fuels
Yu Wang, Jianfeng Pan, Junfeng Wang, Qingbo Lu, Yi Zhang, Evans K. Quaye
Summary: The FREI dynamics of methane/oxygen mixture were experimentally observed in a micro quartz tube combustor. A 2-D model successfully predicted the propagation features of the FREI flame, which were in agreement with the experimental results. Four stages of flame front propagation were revealed based on simulations: accelerating stage, decelerating stage, reverse propagating stage, and weak reaction stage. Further analysis on radical and heat release rate (HRR) confirmed that the regeneration of CH4 behind the flame front and the reducing consumption of the overall amount of methane were the main factors for flame deacceleration and eventually extinction. After extinction, methane consumption tended to occur along the combustor wall due to the high wall temperature.
Article
Energy & Fuels
Junjie Chen, Zhiwei Pang
Summary: The study focused on investigating catalytically stabilized combustion of a methane-air mixture in a micro-scale heat-recirculating system to understand flame stabilization mechanisms and system design insights. The research identified factors for improved flame stability and combustion characteristics, highlighting the importance of catalytic action and heat-recirculating structure.
Article
Chemistry, Physical
Wei Gao, Yunfei Yan, Lujing Huang, Weiwei Zhang, Kaiming Shen
Summary: The swirl micro combustor with twisted vanes (Swirl-MC-TV) demonstrates better combustion stability and efficiency compared to the conventional micro combustor (Conventional-MC) under conditions of high inlet velocity, steel and SiC wall materials, and high equivalence ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Xiao Yang, Bo Yu, Wenming Yang, Huaichun Zhou
Summary: In the field of micro and mesoscale combustion, the study provides a comprehensive heat transfer analysis in cylindrical combustors from the perspective of numerical simulation. The results show that the proportion of radiative heat flux increases with an increasing diameter, and thermal radiation can change the location of the flame front in larger diameter combustors.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Li Guo, Ming Zhai, Shijie Xu, Qianhao Shen, Peng Dong, Xue-Song Bai
Summary: The study demonstrates that the addition of hydrogen can widen the stable combustion range of methane/air flames in micro confined spaces, increase the frequency and maximum propagation velocity of FREI flames, and decrease the quenching distance of CH4/H2/air flames.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Shoujun Ren, William P. Jones, Xiaohan Wang
Summary: The hydrogen-enrichment combustion performance was numerically investigated using different volume proportions of hydrogen mixed with methane in a vortex-tube combustor. The results show that this combustion technique exhibits good adaptability and ultra-steady combustion with a high stability limit. The non-premixed flame structure enhances the local concentration of species and improves stability, while the strong vortex flow inhibits flame blow-out. The laminarization of the flow field provides good aerodynamic and thermodynamic stability, resulting in a large Richardson number and ultra-weak thermo-acoustic coupling, indicating good flame-dynamic stability.
Article
Energy & Fuels
Guangyao Yang, Aiwu Fan
Summary: This study experimentally explored the combustion characteristics of n-C4H10/air mixtures in a partially filled tube with wire mesh. The findings reveal that flame morphology, extinction limit, and temperature vary with different equivalence ratios and inlet velocities.
Article
Energy & Fuels
Xing Li, Shengrong Xie, Jing Zhang, Daiqing Zhao, Xiaohan Wang
Summary: The effect of wall thickness on the combustion characteristics of nonpremixed hydrogen micro-jet flames was studied. It was found that wall thickness affects the temperature distribution, flame shape, and heat recirculation, which in turn affect the combustion efficiency.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Thermodynamics
Alireza Rahbari, Sajad Homayoonfar, Esmaeil Valizadeh, Mohammad Reza Aligoodarz, Davood Toghraie
Summary: The major challenge in the development of micro-combustors is flame instabilities, which lead to non-uniform wall temperature distribution and lower combustion efficiency. This research investigates the combustion characteristics and geometrical configurations on flame stability and combustion efficiency, with a detailed chemical reaction mechanism developed and parametric study conducted. Increasing thermal conductivity coefficient, equivalence ratio, and using a micro-combustor with bluff body are identified as effective ways to improve combustion performance.
Article
Energy & Fuels
Qingguo Peng, Jia Wei, Wenming Yang, E. Jiaqiang
Summary: The combustion characteristics and thermal performance of premixed H-2/C3H8/air in a micro planar combustor with a block insert were experimentally and numerically tested. The effects of hydrogen blended fraction, equivalence ratio, flow rate, and block width on flame stability and heat transfer were discussed and analyzed. The results showed that adding hydrogen improved combustion stability in the micro combustor, and the lowest hydrogen blending mole fraction for a steady flame of the premixed H-2/C3H8/air was obtained through experimental study.
Article
Energy & Fuels
Zhen Cao, Yajin Lyu, Jiangbo Peng, Penghua Qiu, Li Liu, Chaobo Yang, Yang Yu, Guang Chang, Biao Yan, Shaozeng Sun, Xin Yu
Summary: The study investigated the effects of steam dilution on flame evolution, frequency, and oscillation characteristics. Results showed that the heat-release frequency shifted blue as hydrogen equivalence ratio increased, with steam content significantly influencing the heat release and periodic oscillations observed at a dilution ratio of 25%. Changing steam content also led to significant alterations in OH radical concentration and distribution, impacting the intensity and location of the oscillation zone. The mode decomposition analysis revealed a close relationship between the growth of the oscillation zone and the flame arm zone.
Article
Mechanics
Debjit Kundu, Arijit Bhattacharya, Sourav Sarkar, Sandip Sarkar, Achintya Mukhopadhyay
Summary: Micro-combustors, which are emerging as portable power sources, face challenges in flame stabilization due to heat losses. Hydrogen, as an eco-friendly fuel, shows potential for micro-combustors with its high calorific value. Numerical simulations were conducted to study the effects of different wall materials (glass, steel, and aluminum) on the dynamics of premixed lean hydrogen-air flames in a 2 mm wide channel. The wall materials play a crucial role in heat conduction, ignition, and flame stabilization.
Article
Green & Sustainable Science & Technology
Yajin Lyu, Chang Xing, Li Liu, Jiangbo Peng, Wenkai Shen, Xin Yu, Penghua Qiu
Summary: This study experimentally investigated the influences of dilution rate and equivalence ratio on the flame characteristics of hydrogen-air micro-mixing combustion. The results showed that increasing the dilution rate reduces the flame area, while decreasing it generates more small-scale wrinkle structures.
Review
Energy & Fuels
Peng Qian, Minghou Liu
Summary: Micro-thermophotovoltaic and micro-thermoelectric systems have attracted extensive attention for their compact configuration, no mechanical noise, wide fuel applicability, and high energy density. The focus of research has been on micro-combustors, with concerns about wall temperature and flame stability. Various micro-combustors with different designs have been proposed, but the effects of influential parameters need to be analyzed and summarized for further research.
Article
Engineering, Environmental
Tao Cai, Aikun Tang, Chong Li
Summary: This study reveals the flame dynamics and stability of ammonia/hydrogen co-firing combustion using experimental and numerical techniques. Experimental results confirm five types of micro-flame structures and delineate a flame stability diagram. The study shows that increasing the blending ratio extends the blowoff limit and enhances flame stability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Aerospace
Daolun Liang, Rui Xiao, Jianzhong Liu, Yang Wang
AEROSPACE SCIENCE AND TECHNOLOGY
(2019)
Article
Thermodynamics
Richen Lin, Chen Deng, Lingkan Ding, Archishman Bose, Jerry D. Murphy
ENERGY CONVERSION AND MANAGEMENT
(2019)
Article
Green & Sustainable Science & Technology
Xihui Kang, Richen Lin, Richard O'Shea, Chen Deng, Lianhua Li, Yongming Sun, Jerry D. Murphy
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Green & Sustainable Science & Technology
Lingkan Ding, Jun Cheng, Richen Lin, Chen Deng, Junhu Zhou, Jerry D. Murphy
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Green & Sustainable Science & Technology
Richen Lin, Chen Deng, Jun Cheng, Jerry D. Murphy
Article
Chemistry, Physical
Heping Li, Daolun Liang, Minghui Yu, Jianzhong Liu, Yang Wang, Aimin Pang, Gen Tang, Xuefeng Huang
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Green & Sustainable Science & Technology
Chen Deng, Richen Lin, Xihui Kang, Benteng Wu, Richard O'Shea, Jerry D. Murphy
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2020)
Article
Engineering, Environmental
Chen Deng, Xihui Kang, Richen Lin, Jerry D. Murphy
CHEMICAL ENGINEERING JOURNAL
(2020)
Review
Biotechnology & Applied Microbiology
Richen Lin, Chen Deng, Wuyuan Zhang, Frank Hollmann, Jerry D. Murphy
Summary: Bioelectrochemical technologies can produce renewable fuels and chemicals, with the recent discovery of a new photoenzyme offering a potential approach for simultaneous product separation and valorization.
TRENDS IN BIOTECHNOLOGY
(2021)
Article
Energy & Fuels
Yang Wang, Heping Li, Inigo Ortega-Fernandez, Xuefeng Huang, Bo Jiang, Daniel Bielsa, Elena Palomo
Summary: This paper studies a unique combination of solar thermal plants and microalgae bioreactor, utilizing a thermocline heat storage tank to stabilize the system. A theoretical model of the system is developed to assess the yearly performance, showing the feasibility of the proposed novel system under varying solar radiation conditions.
Article
Thermodynamics
Daolun Liang, Dekui Shen, Weidong Zhong, Yang Wang, Jianzhong Liu
Summary: The combustion of a single boron particle involves three continuous macroscopic processes, with the intermediate ignition process being the most complex. A comprehensive kinetic ignition model is developed to overcome the shortcomings of existing models. The model is validated through experiments and used to study the effects of different parameters on ignition time.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Inigo Ortega-Fernandez, Ana Belen Hernandez, Yang Wang, Daniel Bielsa
Summary: This study investigates the use of a packed bed thermal energy storage system for small-scale concentrated solar power plants, aiming to improve dispatchability and cost-effectiveness. The system utilizes Magnetite ore as heat storage media and Delcoterm Solar E15 thermal oil as heat transfer fluid, demonstrating potential in thermal performance and affordability.
Article
Thermodynamics
Yang Wang, Wen Ao, Inigo Ortega-Fernandez, Daolun Liang, Heping Li, Bo Jiang, Xuefeng Huang, Daniel Bielsa
ENERGY CONVERSION AND MANAGEMENT
(2020)
Article
Energy & Fuels
Yang Wang, Inigo Ortega-Fernandez, Heping Li, Xuefeng Huang, Bo Jiang, Daniel Bielsa
Proceedings Paper
Energy & Fuels
Inigo Ortega-Fernandez, Yang Wang, Mikel Duran, Erika Garitaonandia, Lucia Unamunzaga, Daniel Bielsa, Elena Palomo
SOLARPACES 2018: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS
(2019)