Article
Energy & Fuels
Xiepeng Sun, Longhua Hu, Xiaolei Zhang, Yong Yang, Fei Ren, Xiang Fang, Keke Wang
Summary: This experimental study investigates the transient flame extinction behavior with fuel diffusion combustion inside a wall-opening compartment under reduced ventilation conditions. The researchers found that flame extinction is more likely to occur in smaller opening sizes or relatively larger compartment scales, and the time to reach flame extinction is influenced by fuel supply flow rate and opening size. Additionally, a formula was established to describe the critical gas temperature right before extinction as a function of a newly defined non-dimensional integrated parameter.
Article
Thermodynamics
Wenkai Shen, Li Liu, Qiming Hu, Guichuang Liu, Jiwei Wang, Ning Zhang, Shaohua Wu, Penghua Qiu, Shaowei Song
Summary: The study investigated the ignition processes under different ignition fuel ratios in a natural gas-fueled micro gas turbine combustion chamber. It identified the appropriate equivalence ratios for ignition and examined the relationship between combustion efficiency, combustion product, and flame stability. The findings suggest the significant influence of ignition fuel ratio on combustion characteristics.
Article
Multidisciplinary Sciences
Guven Gonca, Bahri Sahin, Mehmet Fatih Hocaoglu
Summary: This study examines the impacts of equivalence ratio and temperature on the performance of spark ignition engines using different liquid-gas fuel mixtures. The results show that equivalence ratio and fuel temperature have significant effects on NO formation and performance characteristics, with different values observed at different ratios and temperatures.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Linyuan Huang, Changchun Liu, Tiandiao Deng, Hua Jiang, Pengzhi Wu
Summary: Central airflow has been investigated for its effects on the combustion stability and shape of swirl flames in this study. Results show that central airflow can alter flame shape and height, but may also cause flame blowout at high equivalence ratios.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Chemistry, Physical
Ziqiang He, Yunfei Yan, Xiuquan Li, Kaiming Shen, Junnan Li, Zhien Zhang
Summary: The study focuses on the impact of hydrogen mass flow rate, equivalence ratio, and materials on the thermal performance of micro-thermophotovoltaic (MTPV) system, providing suggestions for improving energy output.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Seungchul Woo, Juho Lee, Kihyung Lee
Summary: Using liquid petroleum gas (LPG) can improve fuel efficiency and reduce pollutant emissions in internal combustion engines. Adjusting the air fuel ratio can further enhance fuel efficiency and emission performance.
Article
Thermodynamics
Yeseul Park, Xinzhuo Li, Minsung Choi, Dongmin Kim, Joongsung Lee, Gyungmin Choi
Summary: The compatibility of imported fuels from Russia to household gas appliances was evaluated in this study. It was found that fuels with higher nitrogen content required higher hydrocarbon content to maintain flame stability. However, actual tests showed that all fuels could be used stably due to the effect of the flame holder and the thermal boundary formed by clustered flames.
Article
Engineering, Mechanical
Thomas Ludwig Kaiser, Kilian Oberleithner
Summary: This study introduces a new method based on the Navier-Stokes equations to model the transport of entropy waves and equivalence ratio fluctuations in turbulent flows. The method linearizes the equations around mean turbulent fields to predict the linear response of flow velocity and passive scalar to harmonic perturbations imposed at boundaries. By applying this method, the study successfully reproduces coherent passive scalar transport dynamics with high accuracy and low numerical costs in turbulent channel flows.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2021)
Article
Thermodynamics
Taotao Zhou, Peng Tang, Taohong Ye
Summary: Machine learning methods were used to construct a heat release rate (HRR) indicator for premixed methane/air flames. Traditional HRR indicators were evaluated and artificial neural network algorithm, support vector regression, and multiple linear regression were used to construct new HRR models. Multiple linear regression algorithm was recommended due to its high prediction accuracy, low model complexity, and simplicity of parameter adjustment. A third-order multiple linear regression model based on radical CH3 and O was proposed as the recommended HRR indicator, which showed high accuracy under different temperature and fuel-air equivalence ratio conditions.
Article
Energy & Fuels
Kang Pan, James Wallace
Summary: The study revealed that fuel injection duration, injector nozzle size, and injection angle can significantly impact natural gas combustion characteristics. Shorter injection duration reduces peak cylinder pressure and emissions, but insufficient injected fuel mass may lead to flame propagation failure. Injector nozzle size influences combustion type, with small nozzles inducing diffusion combustion and large nozzles inducing partially premixed combustion. Fuel injection angle affects combustion by modifying flame propagation from the glow plug shield.
Article
Thermodynamics
Khalid Hadi, Ryo Ichimura, Genya Hashimoto, Yu Xia, Nozomu Hashimoto, Osamu Fujita
Summary: The study focused on the impact of coal fuel ratio on turbulent flame speed of ammonia/coal particle cloud co-combustion. Results showed that low equivalence ratio co-combustion with ammonia resulted in significantly faster flame speeds compared to pure coal or pure ammonia combustion, while high-fuel-ratio coals showed lower flame speeds compared to pure ammonia combustion. The study proposes a flame propagation mechanism for the co-combustion, highlighting the role of local equivalence ratio and radiation heat flux in influencing flame speed.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Chemistry, Physical
Xun Tao, Xinlei Yu, Songling Guo, Abdul Raheem, Yunfei Gao, Lu Ding, Zhenghua Dai, Guangsuo Yu, Fuchen Wang
Summary: The effect of equivalence ratios on acid gas combustion in a pure oxygen atmosphere was studied using a coaxial jet double channel burner. The distribution of flame temperature and gas composition was analyzed for different equivalence ratios (F = 0.8, 1.0, and 1.5). The results showed that acid gas combustion involved chemical decomposition and oxidation reactions, with different reactions occurring at different radial positions. Increasing the equivalence ratio increased flame temperature and the volume fraction of CO, H2, and COS in the combustion area. The content of CO, H2, and COS was significantly higher under Claus condition in the inverse diffusion flame.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Chemical
Mingjian Liao, Zhu He, Xiong Liang, Tat Leung Chan, Yawei Li, Xuecheng Xu
Summary: This paper establishes a cylindrical two-layer porous burner model combined with oxy-fuel combustion to study the effects of combustion in porous media on reaction rate and temperature uniformity. The experimental results show that the heat loss from the burner walls leads to a decrease in temperature, which slows down the flame propagation speed and CO oxidation rate.
Article
Thermodynamics
Richard A. Messerly, Jon H. Luecke, Peter C. St John, Brian D. Etz, Yeonjoon Kim, Bradley T. Zigler, Robert L. McCormick, Seonah Kim
Summary: This study investigated the impact of chemical structure on phi-sensitivity through experimental, simulation, and theoretical approaches, revealing that branching and functional groups strongly influence phi-sensitivity. The study also utilized phi-D kinetic simulations and quantum mechanical calculations to analyze the observed trends and provide insights into selecting highly phi-sensitive compounds.
COMBUSTION AND FLAME
(2021)
Article
Energy & Fuels
Wanchen Sun, Wenpeng Zeng, Liang Guo, Hao Zhang, Yuying Yan, Shaodian Lin, Genan Zhu, Mengqi Jiang, Changyou Yu, Fei Wu
Summary: Under the background of the carbon peak and carbon neutrality, the development and utilization of zero-carbon fuels, such as green ammonia and green hydrogen, have gained attention. The transportation and storage issues of hydrogen limit its industrial development, while ammonia has advantages as a hydrogen energy carrier for power systems. A study on the combustion and flame development of the ammonia-diesel dual-fuel engine was conducted, and the results showed that ammonia combustion has lower heat release and lower indicated mean effective pressure compared to pure diesel combustion. The flame characteristics of the ammonia-diesel dual-fuel combustion mode differed from the pure diesel combustion mode.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)