Article
Thermodynamics
Xiang Qian, Chun Zou, Hao Lu, Hong Yao
Summary: The study successfully simulated high swirl stratified flames and compared the results with experimental data and reference results, showing good agreement with experimental data and a significant improvement compared to reference results.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Sajjad Rahimi, Kiumars Mazaheri, Alireza Alipoor, Amirreza Mohammadpour
Summary: This numerical study investigates the impact of adding 20% and 40% hydrogen in different slots of a turbulent methane-air flame. Injection configurations include the inner slot, outer slot, and both slots. The results show that adding hydrogen in the inner slot and both slots increases combustion intensity and robust flame attachment, while adding hydrogen in the outer slot has minimal effects. In terms of pollutant emissions, the addition of hydrogen decreases CO and increases NOx emission in all configurations.
Article
Thermodynamics
Sangjukta Devi, Niranjan Sahoo, P. Muthukumar
Summary: The aim of this study is to compare the performance of a newly developed SFPRB with a conventional CB. The SFPRB showed higher thermal efficiency and lower pollutant emissions compared to the CB, making it a more efficient and cleaner burner for crude biogas application.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Goncalo P. Pacheco, Rodolfo C. Rocha, Miguel C. Franco, Miguel A. A. Mendes, Edgar C. Fernandes, Pedro J. Coelho, Xue-Song Bai
Summary: Ammonia is considered a promising fuel for decarbonization in the power sector due to its lack of carbon and ability to produce energy with zero CO2 emissions. However, challenges such as low reactivity, low flame speed, and formation of nitrogen oxides and ammonia slip exist during its combustion. The use of rich-to-lean combustion approaches can help mitigate NOx formation and improve combustion efficiency, as investigated experimentally and computationally in this study.
Article
Thermodynamics
Xu Wen, Hendrik Nicolai, Henrik Schneider, Liming Cai, Johannes Janicka, Heinz Pitsch, Christian Hasse
Summary: A large-eddy simulation was conducted on a swirl-stabilized multi-stream laboratory-scale pulverized coal burner designed for oxy-fuel investigation, showing that the oxy-coal flame is narrower than the air-coal flame and particle clustering phenomenon can be observed in the oxy-fuel atmosphere. The distributions of thermo-chemical quantities are significantly different under different conditions.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Ali Cemal Benim, Cansu Deniz Canal, Yakup Erhan Boke
Summary: Computational investigation of swirling pulverized coal and biomass flames for oxy-combustion reveals that the Reynolds Stress Model (RSM) captures unsteady dynamics better than the k-epsilon model. Predicted velocities show better agreement with measurements using RSM. However, both models underestimate the measurements, with discrepancies quantified in peak values of axial velocity. Biomass flame is predicted to be nearly twice as long as coal flame.
Article
Energy & Fuels
Viktor Jozsa, Gyongyver Tothpalne Hidegh, David Csemany, Reka Anna Kardos, Cheng Tung Chong
Summary: The ongoing energy revolution requires a drastic change in energy carriers, especially in the industry and transportation sectors. Advanced combustion systems with ultra-low emission and high fuel flexibility are crucial. The Mixture Temperature-Controlled (MTC) combustion concept shows promising potential for gas turbines and boilers, achieving efficient combustion while meeting strict emission standards.
Article
Energy & Fuels
Medhat A. A. Nemitallah, Mohamed S. S. Elzayed, Abdulrahim Alshadidi, Mohanad Abualkhair, Ahmed Abdelhafez, F. M. Alzahrani, Abdul Gani Abdul Jameel
Summary: This study numerically investigates the effects of equivalence ratio on flow/flame interactions and emissions in a stratified oxy-methane burner. The results show that flame stratification can be achieved by varying the equivalence ratio, and the stratified flames exhibit effective flame/flow interactions, complete combustion, and reduced emissions.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Thermodynamics
Nikola Sekularac, XiaoHang Fang, W. Kendal Bushe, Martin H. Davy
Summary: Data from the Cambridge/Sandia swirl database is combined to study the effects of scalar variables on the spatial fluctuations of reactive scalars in conditional moment closure (CMC) approaches. Principal component analysis (PCA) is used to identify the most appropriate scalar variables. The results suggest that using control variables based on mixture fraction and progress variable can reduce the fluctuations of scalars.
COMBUSTION THEORY AND MODELLING
(2023)
Article
Thermodynamics
Belal Y. Belal, Gesheng Li, Zunhua Zhang, H. M. El-Batsh, Hany A. Moneib, Ali M. A. Attia
Summary: The paper provides a quantitative comparison between the aerodynamic flow field and combustion emission characteristics of two swirl burners under cold flow and hot conditions. The low swirl burner exhibits a stable and uniform reaction zone, while the high swirl burner shows higher peak levels of temperature and emissions, potentially leading to greater exhaust emissions.
Article
Energy & Fuels
Ogbonnaya Agwu, Agustin Valera-Medina, Tomaz Katrasnik, Tine Seljak
Summary: This study investigates the utilization of glycerol in power generation applications, where stable flames were achieved by combusting glycerol blended with methanol. The 50/50 combination of methanol/glycerol exhibited greater flame stability compared with the 70/30 combination, as indicated by CH* chemiluminescence data and spectral analysis.
Article
Thermodynamics
Fatma Cansu Yuecel, Fabian Habicht, Florian Arnold, Rudibert King, Myles Bohon, Christian Oliver Paschereit
Summary: The concept of shockless explosion combustion (SEC) aims to achieve pressure gain combustion through multiple, distributed autoignitions occurring simultaneously. An injection strategy is proposed to control the local equivalence ratio throughout the combustor, and an extremum seeking control algorithm successfully optimizes the formation of different autoignition modes.
COMBUSTION AND FLAME
(2021)
Article
Energy & Fuels
Mohammed Zaitri, Mostefa Bouchetara, Ali Bouziane, Ahmed Alami
Summary: This article numerically studies hydrogen enriched natural gas swirl flames, showing the importance of hydrogen as a combustion enhancer. The results demonstrate good agreement between numerical and experimental results, with the RNG k-ε turbulence model performing well. The RNG k-ε model consistently demonstrates superiority in predicting turbulent isothermal and reacting swirling flows with varying hydrogen percentages.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Guoneng Li, Zhihao Zhu, Youqu Zheng, Wenwen Guo, Yuanjun Tang, Chao Ye
Summary: This study introduces a newly designed swirl combustor for micro thermoelectric generators (TEG) to address efficiency and environmental concerns. The results show that the maximum systematic efficiency of the TEG is 3.47% at an input power of 673 W, which is 15.6% higher than the previous swirl-combustion-powered TEG. Furthermore, the combustion efficiency, heat collection efficiency, noise level, CO concentration, and NO pollution are significantly improved.
Article
Thermodynamics
Shoujun Ren, Haolin Yang, Xiaohan Wang
Summary: The study focuses on the oxygen-deficient combustion characteristics of methane in a localized stratified vortex-tube combustor (LSVC) by diluting combustion air with nitrogen. Experimental investigations show that LSVC can achieve a wide stability limit and low NOx emissions.
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.