Article
Energy & Fuels
Hubert Kuszewski, Artur Jaworski, Maksymilian Madziel, Pawel Wos
Summary: The auto-ignition properties of blends of high cetan rape methyl esters (RME) as biodiesel and 1-butanol were studied. The results showed that an increase in the fraction of 1-butanol in the fuel blend led to longer ignition and combustion delay periods in the combustion chamber.
Article
Green & Sustainable Science & Technology
Qiankun Zhang, Jin Xia, Jianping Wang, Zhuoyao He, Wenbin Zhao, Yong Qian, Liang Zheng, Rui Liu, Xingcai Lu
Summary: This study investigates the ignition and combustion characteristics of biodiesel-butanol blends at different injection pressures. The results show that the ignition delay times of all tested fuels increase with decreased injection pressure or increased n-butanol proportion. Increasing the injection pressure or n-butanol proportion could increase the ignition distance, while decreasing the combustion duration and the variation rate of flame area and spatially integrated natural luminosity. The addition of a large proportion of n-butanol leads to a larger flame fluctuation, which is not beneficial for ignition and combustion processes.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Energy & Fuels
Siwook Nam, Hyemin Kim
Summary: The combustion characteristics of 1-butanol gel fuel droplets were studied under different pressure and temperature conditions. It was found that the combustion behavior of the gel droplet was largely influenced by the gel layer at the droplet surface, making it insensitive to pressure.
Article
Thermodynamics
Ziyu Wang, Zhenyu Lu, Sai C. Yelishala, Hameed Metghalchi, Yiannis A. Levendis
Summary: Propane as an alternative refrigerant is considered due to its low Global Warming Potential and zero Ozone Depletion Potential, and blending it with CO2 can reduce fire safety concerns. CO2 enhances flame stability and decreases laminar burning speed when mixed with propane, affecting flame instability.
Article
Thermodynamics
Inna Gorbatenko, Derek Bradley, Alison S. Tomlin
Summary: The paper reports a study on the auto-ignitive and anti-knock properties of neat n-butanol and its blends with a gasoline-type fuel, TRF. Mathematical modelling was used to analyze the chemical kinetics and main reactions influencing heat release rates. Results showed that the addition of n-butanol could improve or reduce knock resistance depending on the operating conditions.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Dehai Yu, Zheng Chen
Summary: The study proposed a comprehensive transient formulation for droplet vaporization, successfully explaining the dynamic changes in droplet size during the vaporization process and aligning well with experimental results. Through theoretical analysis, it revealed the dual effect of pressure on droplet vaporization.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Multidisciplinary
Sumit Maharjan, Ayman M. Elbaz, William L. Roberts
Summary: This study investigates the interaction between engine oil and fuel, and finds that the concentration of the fuel and the type of fuel both affect the auto-ignition behavior. The findings highlight the importance of studying fuel concentration and different types of fuel in pre-ignition.
Article
Thermodynamics
Mengdi Li, Denghao Zhu, Xiaoyu He, Kai Moshammer, Ravi Fernandes, Bo Shu
Summary: The auto-ignition properties of ammonia/ethanol blends under engine operating conditions were investigated. Ethanol was found to significantly promote the reactivity of ammonia, leading to a decrease in auto-ignition temperature. The new chemical kinetic mechanism developed for NH3/C2H5OH mixtures could accurately reproduce the ignition delay time measurement results. The addition of ethanol enriched the O/H radical pool and provided key interaction pathways to enhance the auto-ignition process.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Minchao Han, Robert L. Gordon, Mohsen Talei, Joshua S. Lacey
Summary: This paper investigates the ignition process of inhomogeneous n-heptane sprays injected by a prototype injector designed for the Engine Combustion Network's Spray G research. The influence of chamber and fuel conditions on the flame kernel formation and flame generation probabilities are analyzed. The study finds that chamber temperature and pressure have significant impacts on ignition probability, while the effects of fuel pressure are opposite to what is expected based on existing parameters.
Article
Energy & Fuels
Jiaying Pan, Zhen Hu, Zhenhua Pan, Gequn Shu, Haiqiao Wei, Tao Li, Changwen Liu
Summary: Ethanol as an oxygenate additive in gasoline can inhibit knocking tendency, delay auto-ignition timing, and reduce pressure oscillations in combustion. Turbulent mixing and energy density play roles in alleviating knocking intensity and promoting detonation development, but fuel reactivity remains the key factor in strong knocking formation and detonation development.
Article
Thermodynamics
Wenlin Huang, Qian Zhao, Zuohua Huang, Henry J. Curran, Yingjia Zhang
Summary: The ignition behavior of DME at low-temperature, low-pressure conditions is different from that at high-pressures, with a repeatable ignition delay time fall-off feature observed, which is strong equivalence ratio dependence and disappears at an equivalence ratio of 5.0. Numerical simulations suggest that the use of a local ignition kernel postulate can better explain the inhomogeneous premature ignition situation.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Chemistry, Physical
Zufar Zaripov, Ruslan R. Nakipov, Farid M. Gumerov, Ilmutdin M. Abdulagatov
Summary: The isobaric heat capacity of hexadecane was measured using a differential scanning calorimeter, and the second temperature derivatives of specific volume, enthalpy, and entropy as a function of temperature and pressure were calculated.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Thermodynamics
Yu Zhang, Ronghua Huang, Sheng Huang, Pei Zhou, Xiaoxuan Rao, Guojun Zhang, Liang Qiu
Summary: The study investigated the puffing, auto-ignition, and combustion characteristics of an n-pentanol-diesel droplet using droplet suspension technology. Different n-pentanol concentrations were found to affect the evolution profiles of OH* intensity.
Article
Energy & Fuels
Zixin Wang, Dong Zhang, Yuan Fang, Meijia Song, Zhen Gong, Liyan Feng
Summary: The auto-ignition behaviors of cylinder oil droplets in low-speed two-stroke natural gas engines were investigated through experimental research and numerical analysis. It was observed that breaking large droplets into smaller ones could intensify pre-ignition. The ignition radius was found to decrease with increasing temperature and pressure, while the vapor/air ratio of ignition moment could be reduced by decreasing ambient temperature and increasing ambient pressure.
Article
Energy & Fuels
Yan Zhang, X. R. Wang, Jiawei Zhang, Chenzhao Yan, Hongzhan Guo, Cangsu Xu
Summary: The laminar combustion characteristics of hydrogen-ethanol blend were studied, and it was found that the thermal-diffusion effect stabilizes the flame surface, while the main cause of flame instability is hydrodynamic effects. Higher pressures and temperatures were found to increase the likelihood of cell instability in flames.
Article
Engineering, Mechanical
Engao Peng, Sheng Huang
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2018)
Article
Energy & Fuels
Yinjie Ma, Ronghua Huang, Jianqin Fu, Sheng Huang, Jingping Liu
Article
Energy & Fuels
Zhaowen Wang, Shuguo Shi, Sheng Huang, Jie Tang, Tao Du, Xiaobei Cheng, Ronghua Huang, Jyh-Yuan Chen
Article
Thermodynamics
Yu Zhang, Yuhan Huang, Ronghua Huang, Sheng Huang, Yinjie Ma, Shijie Xu, Zhaowen Wang
APPLIED THERMAL ENGINEERING
(2018)
Article
Thermodynamics
Yu Zhang, Ronghua Huang, Yuhan Huang, Sheng Huang, Yinjie Ma, Shijie Xu, Pei Zhou
Article
Thermodynamics
Sheng Huang, Yu Zhang, Ronghua Huang, Shijie Xu, Yinjie Ma, Zhaowen Wang, Xinhua Zhang
Article
Chemistry, Physical
Sheng Huang, Ronghua Huang, Pei Zhou, Yu Zhang, Zhouping Yin, Zhaowen Wang
Summary: The investigation reveals that the lean H-2-air flame retains a two-stage self-acceleration feature in weak turbulent flow fields, which weakens as turbulent intensity increases; it transitions to a single-stage feature when the Karlovitz number exceeds 1. The observations are linked to the distribution and evolution of length scales in the cellular structure of the flamefront. Theoretical analysis comparing growth rates of disturbances induced by instability and turbulence provides interpretations for the observed phenomena and the response of quantitative parameters.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Yuling Dou, Haiqiang Liu, Bin Liu, Yu Zhang, Yongqiang Liu, Xiaozhang Cheng, Changfa Tao
Summary: The study investigated the flame radiation fraction of a turbulent jet diffusion flame of propane and carbon dioxide mixed gas with different nozzle diameters. The results indicated that the flame radiation fraction decreases with increasing carbon dioxide concentration for a given heat release rate. Theories of soot formation and laminar flame speed were used to explain the variation in radiation fraction under different volume fractions of carbon dioxide.
Article
Thermodynamics
Yu Zhang, Ronghua Huang, Sheng Huang, Pei Zhou, Xiaoxuan Rao, Guojun Zhang, Liang Qiu
Summary: The study investigated the puffing, auto-ignition, and combustion characteristics of an n-pentanol-diesel droplet using droplet suspension technology. Different n-pentanol concentrations were found to affect the evolution profiles of OH* intensity.
Article
Energy & Fuels
Yu Zhang, Ronghua Huang, Pei Zhou, Sheng Huang, Guojun Zhang, Yang Hua, Yejian Qian
Summary: The simulation researches the effect of experimental parameters on the evaporation characteristics of n-butanol-dodecane blends. Factors such as droplet diameter, wire diameter, junction diameter, ambient temperature, and n-butanol concentration all play significant roles in determining the equilibrium temperature and average evaporation rate. The study shows that both K-ave and T-equ exhibit complex variations with changes in these parameters, and a polynomial model can reasonably predict the normalized evaporation rate.
Article
Energy & Fuels
Jie Zhang, Xiou Zhou, Huaizhi Han, Sheng Huang, Zerong Li, Huagui Zhong
Summary: Ground ignition and high-altitude ignition are important performance indexes of a combustor. In this study, an internally-staged combustor and five pilot-stage centrifugal atomizers with engineering scale were developed, and their flow characteristics and ignition performance were studied. The results showed that the combustor relative air pressure drop and pilot-stage flow number had an impact on the ignition performance.
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.
