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学者姓名：王景甫
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摘要 ：
The volume fraction of the carbon nanotube (CNT) plays a key role in ensuring the performance of the CNT reinforced polymer composite, especially under the severe vibration, which leads to the resonance and failure of the composite structure. In this paper, a bottom-up multiscale method is adopted to study the effect of the CNT volume fractions on the nonlinear vibration of the poly (methyl methacrylate) (PMMA)/CNT composite. According to the molecular simulation, the longitudinal, transverse and shear moduli of the PMMA/CNT nanocomposites are found to increase with the increasing CNT volume fractions. Substituting the simulated moduli into the extended rule of mixtures (EROM), the efficiency parameters of the PMMA/CNT composite with various CNT volume fractions are derived based on a homogenization approach. The derived efficiency parameters are used in the functionally graded (FG)-based EROM to obtain the expressions of the longitudinal, transverse and shear moduli of the macroscopic composite plate, so as to obtain the constitutive equation for the nonlinear vibrations of the FG-based PMMA/CNT composite plate. The subsequent meshless simulation results demonstrate that the natural frequencies of the FG-based composite plate increase with the increasing volume fractions, whereas the ratios of the nonlinear to linear frequencies decrease. Using the bottom-up multiscale analysis, the macroscopic vibration responses are analyzed for the PMMA/CNT composites with the CNT volume fractions up to 9.0%, which provides a paradigm of the design of the PMMA/CNT composite by considering the CNT volume fraction effect.
关键词 ：
CNT composite CNT composite CNT volume fraction CNT volume fraction Meshless simulation Meshless simulation Molecular dynamics Molecular dynamics Nonlinear vibration Nonlinear vibration PMMA PMMA
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| GB/T 7714 | Wang, J. F. , Yang, J. P. , Tam, L-H et al. Effect of CNT volume fractions on nonlinear vibrations of PMMA/CNT composite plates: A multiscale simulation [J]. | THIN-WALLED STRUCTURES , 2022 , 170 . |
| MLA | Wang, J. F. et al. "Effect of CNT volume fractions on nonlinear vibrations of PMMA/CNT composite plates: A multiscale simulation" . | THIN-WALLED STRUCTURES 170 (2022) . |
| APA | Wang, J. F. , Yang, J. P. , Tam, L-H , Zhang, W. . Effect of CNT volume fractions on nonlinear vibrations of PMMA/CNT composite plates: A multiscale simulation . | THIN-WALLED STRUCTURES , 2022 , 170 . |
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摘要 ：
In order to recover the energy loss due to the throttling in the path of ammonia-lean solution in the Kalina Cycle System (KCS) 34, two redesigned cycles, in which single-screw expanders that can perform two-phase expansion are used to replace the throttle valve, are proposed in this paper. The results show that the thermal efficiency and net work of two redesigned cycles are higher than those of the original KCS 34. With the concentration increase of ammonia-water mixture, the work produced by the single-screw expander B in two redesigned cycles gradually decreases, and the difference between the work produced in two redesigned cycles also gradually decreases. The original KCS 34 and two redesigned cycles have high exergy efficiency. The highest cycle exergy efficiency of 56.59% can be obtained in the II-redesigned cycle when the evaporation pressure is 3.0 MPa and ammonia-water concentration is 0.75.
关键词 ：
ammonia-water concentration ammonia-water concentration kalina cycle system (KCS)34 kalina cycle system (KCS)34 single-screw expander single-screw expander thermodynamic performance thermodynamic performance throttle valve throttle valve
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| GB/T 7714 | Zhang, Xinxin , Li, Zhenlei , Wang, Jingfu et al. Performance Improvement of KCS (Kalina Cycle System) 34 by Replacing Throttle Valve With Single-Screw Expander [J]. | FRONTIERS IN ENERGY RESEARCH , 2021 , 9 . |
| MLA | Zhang, Xinxin et al. "Performance Improvement of KCS (Kalina Cycle System) 34 by Replacing Throttle Valve With Single-Screw Expander" . | FRONTIERS IN ENERGY RESEARCH 9 (2021) . |
| APA | Zhang, Xinxin , Li, Zhenlei , Wang, Jingfu , Wu, Yuting , Ma, Chongfang . Performance Improvement of KCS (Kalina Cycle System) 34 by Replacing Throttle Valve With Single-Screw Expander . | FRONTIERS IN ENERGY RESEARCH , 2021 , 9 . |
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摘要 ：
氨气作为一种可持续和可再生燃料近年来引起研究者广泛的兴趣，然而由于较低的层流火焰传播速度和较高的NO排放，需要对此进行进一步研究。本文通过数值研究的方法，计算了NH3-H2-空气火焰的火焰传播速度和NO排放量，并且进行了火焰的详细反应敏感性分析，研究了化学当量条件下氢气对于火焰传播速度以及NO影响的原因。结果表明，随着燃料中H2成分的增加，改变了火焰中自由基的浓度，提升了火焰中重要反应的反应速率，同时对反应路径有着较为明显的影响，从而增强了火焰传播速度以及NO的摩尔分数。
关键词 ：
Sensitivity Analysis Sensitivity Analysis NO排放 NO排放 NO Emission NO Emission Reaction Path Reaction Path Ammonia Fuel Ammonia Fuel Flame Propagation Velocity Flame Propagation Velocity 反应路径 反应路径 火焰传播速度 火焰传播速度 敏感性分析 敏感性分析 氨燃料 氨燃料
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| GB/T 7714 | 张晓磊 , 王景甫 , 陈颖 et al. NH3-H2-空气的层流火焰传播特性和NO排放特性 [J]. | 可持续能源 , 2021 , 11 (01) : 1-10 . |
| MLA | 张晓磊 et al. "NH3-H2-空气的层流火焰传播特性和NO排放特性" . | 可持续能源 11 . 01 (2021) : 1-10 . |
| APA | 张晓磊 , 王景甫 , 陈颖 , 李丛豪 . NH3-H2-空气的层流火焰传播特性和NO排放特性 . | 可持续能源 , 2021 , 11 (01) , 1-10 . |
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摘要 ：
NH<sub>3</sub>-H<sub>2</sub>-空气的层流火焰传播特性和NO排放特性
关键词 ：
NO排放 NO排放 反应路径 反应路径 反应速率 反应速率 可再生燃料 可再生燃料 摩尔分数 摩尔分数 敏感性分析 敏感性分析 火焰传播特性 火焰传播特性 火焰传播速度 火焰传播速度
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| GB/T 7714 | 张晓磊 , 王景甫 , 陈颖 et al. NH<sub>3</sub>-H<sub>2</sub>-空气的层流火焰传播特性和NO排放特性 [J]. | 张晓磊 , 2021 , 11 (1) : 1-10 . |
| MLA | 张晓磊 et al. "NH<sub>3</sub>-H<sub>2</sub>-空气的层流火焰传播特性和NO排放特性" . | 张晓磊 11 . 1 (2021) : 1-10 . |
| APA | 张晓磊 , 王景甫 , 陈颖 , 李丛豪 , 可持续能源 . NH<sub>3</sub>-H<sub>2</sub>-空气的层流火焰传播特性和NO排放特性 . | 张晓磊 , 2021 , 11 (1) , 1-10 . |
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摘要 ：
In order to solve the problem of energy utilization of urban plastic garbage and livestock manure, this paper developed a method and technology to produce high-calorific value biomass char fuel through low-temperature pyrolysis in drying, thermal decomposition, extrusion and other processes, using urban plastic garbage and chicken manure as raw materials which are difficult to recycle. Established the verification experiment device in Chiba prefecture, with a 15% plastic + 85% chicken manure as raw material, the preparation of the calorific value of 5500-6000 kcal/kg of high calorific value of biomass char fuel. The ignition temperature, burning-out temperature, comprehensive combustion characteristic index S and other combustion characteristics of fuel were analysed by thermogravimetric experiments. The kinetic analysis of fuel was carried out by means of Coats-Redfern method. The pre-exponential factor and activation energy of combustion temperature range were obtained. The results show that the volatilization of biomass char fuel exceeds 60%, the ignition temperature and burnout temperature are low, and the ignition performance is good and the combustion speed is fast. The fuel calorific value is 24985kJ/kg (5976kcal/kg), the activation energy is 55.11kJ/mol, and the comprehensive combustion characteristic index S is 4.57 10-8 min-2K-3, which is similar to bituminous coal. In addition, biomass char fuel contains almost no sulphur and does not require desulfurization equipment. It is a kind of biomass fuel that can achieve clean and efficient combustion and replace coal. © Published under licence by IOP Publishing Ltd.
关键词 ：
Activation energy Activation energy Agriculture Agriculture Animals Animals Biomass Biomass Bituminous coal Bituminous coal Calorific value Calorific value Coal combustion Coal combustion Coal industry Coal industry Decomposition Decomposition Energy utilization Energy utilization Fertilizers Fertilizers Fuels Fuels Ignition Ignition Manures Manures Temperature Temperature Waste incineration Waste incineration
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| GB/T 7714 | Wang, Jingfu , Matsushita, Takamichi , Yuminaga, Jikyou et al. Study on the Preparation Method and Combustion Characteristics of Biomass Char Fuel Made from Chicken Manure Synergistic Plastic Waste [C] . 2021 . |
| MLA | Wang, Jingfu et al. "Study on the Preparation Method and Combustion Characteristics of Biomass Char Fuel Made from Chicken Manure Synergistic Plastic Waste" . (2021) . |
| APA | Wang, Jingfu , Matsushita, Takamichi , Yuminaga, Jikyou , Jia, Hongxin . Study on the Preparation Method and Combustion Characteristics of Biomass Char Fuel Made from Chicken Manure Synergistic Plastic Waste . (2021) . |
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摘要 ：
The COVID-19 pandemic has put the whole world in a great lockdown and greatly changed our lives. The lockdown caused by the COVID-19 pandemic has greatly affected the transportation industry in China. In this paper, energy consumption and carbon dioxide emissions of fuel vehicles and battery electric vehicles in China during the COVID-19 pandemic was estimated and analyzed. The impact of COVID-19 pandemic was analyzed. The study period is taken from September 2019 to April 2020, and the period from September 2018 to August 2019 is taken for comparison. Moreover, energy consumption and CO2 emissions of fuel vehicles during SARS epidemic was also analyzed. The related study period is taken from January 2003 to August 2003. The results show COVID-19 has a much larger impact on transportation energy consumption and CO2 emissions than SARS. After the COVID-19 pandemic, energy conservation and emission reduction still have a long way to go. Determining the energy consumption and emissions in transportation sector during the COVID-19 pandemic will provide the government with a reference for future energy conservation and emission reduction in transportation sector and the further promotion of battery electric vehicles.
关键词 ：
Carbon dioxide emissions Carbon dioxide emissions COVID-19 COVID-19 Energy consumption Energy consumption SARS SARS Transportation sector Transportation sector
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| GB/T 7714 | Zhang, Xinxin , Li, Zhenlei , Wang, Jingfu . Impact of COVID-19 pandemic on energy consumption and carbon dioxide emissions in China's transportation sector [J]. | CASE STUDIES IN THERMAL ENGINEERING , 2021 , 26 . |
| MLA | Zhang, Xinxin et al. "Impact of COVID-19 pandemic on energy consumption and carbon dioxide emissions in China's transportation sector" . | CASE STUDIES IN THERMAL ENGINEERING 26 (2021) . |
| APA | Zhang, Xinxin , Li, Zhenlei , Wang, Jingfu . Impact of COVID-19 pandemic on energy consumption and carbon dioxide emissions in China's transportation sector . | CASE STUDIES IN THERMAL ENGINEERING , 2021 , 26 . |
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摘要 ：
Ammonia (NH3) is not only expected to be used as a hydrogen energy carrier but also expected to become a carbon-free fuel. Methane (CH4) can be used as a combustion enhancer for improving the combustion intensity of NH3. In addition, it is important to understand the flame characteristics of NH3-air at elevated pressures and temperatures. The laminar flame speed of NH3-CH4-air is numerically investigated, where the mole fraction of CH4 ranges from 0 to 50% in binary fuels and the pressure and initial temperature are up to 10 atm and 1000 K, respectively. The calculated value from the Okafor mechanism is in excellent agreement with experimental data. The CH4 in the fuel affects the flame speed by changing the main species of free radicals in the flame; the high pressure not only increases the rate-limiting reaction rate in the flame but also reduces the amount of H, O, and OH radicals in the flame, so as to restrain the propagation of the flame. At a higher initial temperature, the faster flame speed is mainly due to the higher adiabatic flame temperature. The laminar flame speed correlation equation has a consistent trend with the simulation results, though with a slight underestimation at higher pressures and temperatures. It is a more effective way to calculate the laminar flame speeds of NH3-air for a given pressure and temperature.
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| GB/T 7714 | Zhang Xiaolei , Wang Jingfu , Chen Ying et al. Effect of CH4, Pressure, and Initial Temperature on the Laminar Flame Speed of an NH3-Air Mixture. [J]. | ACS omega , 2021 , 6 (18) : 11857-11868 . |
| MLA | Zhang Xiaolei et al. "Effect of CH4, Pressure, and Initial Temperature on the Laminar Flame Speed of an NH3-Air Mixture." . | ACS omega 6 . 18 (2021) : 11857-11868 . |
| APA | Zhang Xiaolei , Wang Jingfu , Chen Ying , Li Conghao . Effect of CH4, Pressure, and Initial Temperature on the Laminar Flame Speed of an NH3-Air Mixture. . | ACS omega , 2021 , 6 (18) , 11857-11868 . |
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摘要 ：
The effects (chemical, thermal, transport, and radiative) of CO2 added to the fuel side and oxidizer side on the flame temperature and the position of the flame front in a one-dimensional laminar counterflow diffusion flame of methane/N-2/O-2 were studied. Overall CO2 resulted in a decrease in flame temperature whether on the fuel side or on the oxidizer side, with the negative effect being more obvious on the latter side. The prominent effects of CO2 on the flame temperature were derived from its thermal properties on the fuel side and its radiative properties on the oxidizer side. The results also highlighted the differences in the four effects of CO2 on the position of the flame front on different sides. In addition, an analysis of OH and H radicals and the heat release rate of the main reactions illustrated how CO2 affects the flame temperature.
关键词 ：
CH4 counterflow diffusion flame CH4 counterflow diffusion flame CO2 dilution CO2 dilution flame front flame front temperature temperature
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei et al. The Effects of CO2 Additional on Flame Characteristics in the CH4/N-2/O-2 Counterflow Diffusion Flame [J]. | MOLECULES , 2021 , 26 (10) . |
| MLA | Chen, Ying et al. "The Effects of CO2 Additional on Flame Characteristics in the CH4/N-2/O-2 Counterflow Diffusion Flame" . | MOLECULES 26 . 10 (2021) . |
| APA | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei , Li, Conghao . The Effects of CO2 Additional on Flame Characteristics in the CH4/N-2/O-2 Counterflow Diffusion Flame . | MOLECULES , 2021 , 26 (10) . |
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摘要 ：
Bus rides have become a routine choice for the large population to travel in Beijing. By the end of November 2020, 82.84% of all buses in Beijing had switched to electric vehicles. A solution to the problem of charging a huge number of battery electric buses (BEBs) in urban areas, especially in crowded cities with large populations, has to be found. In the present paper, a calculation model based on the levelized cost of electricity (LCOE) is established for comparison and analysis of the BEB charging. The calculation results show that the hybrid charging mode is economically feasible. Moreover, from the perspectives of optimizing operation shifts and responding to emergency situations, hybrid charging mode is applicable to the current electric bus system. The calculation results also show that the use of BEBs as the main ground public transportation in Beijing can substantially reduce CO2 emissions and save huge fuel costs. Its application is a very wise choice. The analogy calculation on Tongzhou District, the sub center of Beijing which is under construction, shows that the use of BEBs in Tongzhou can reduce CO2 emissions by about 34.6% on average compared with fuel buses. The population is the main influencing factor of analogy calculation.
关键词 ：
Battery electric bus Battery electric bus Beijing city Beijing city Carbon dioxide emission Carbon dioxide emission Charging system Charging system Energy consumption Energy consumption Tongzhou district Tongzhou district
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| GB/T 7714 | Zhang, Xinxin , Nie, Shangyang , He, Maogang et al. Charging system analysis, energy consumption, and carbon dioxide emissions of battery electric buses in Beijing [J]. | CASE STUDIES IN THERMAL ENGINEERING , 2021 , 26 . |
| MLA | Zhang, Xinxin et al. "Charging system analysis, energy consumption, and carbon dioxide emissions of battery electric buses in Beijing" . | CASE STUDIES IN THERMAL ENGINEERING 26 (2021) . |
| APA | Zhang, Xinxin , Nie, Shangyang , He, Maogang , Wang, Jingfu . Charging system analysis, energy consumption, and carbon dioxide emissions of battery electric buses in Beijing . | CASE STUDIES IN THERMAL ENGINEERING , 2021 , 26 . |
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摘要 ：
Poly (methyl methacrylate) (PMMA)/carbon nanotube (CNT) composite plates have been extensively used in aviation and aerospace fields. During intended service life, the PMMA/CNT composite structure is prone to severe vibration, which leads to the formation of cracks and the fracture of structures. In order to achieve vibration attenuation, it requires a fundamental understanding of the vibration behavior of composite structures. Here, a molecular dynamics (MD) based multiscale approach is developed to analyze the nonlinear vibration behavior of PMMA/CNT composite plate. Molecular simulations are performed to capture the mechanical properties of the composite and constituents, including longitudinal, transverse, and shear moduli of single-walled CNT (SWCNT) segment, PMMA matrix, and PMMA/SWCNT nanocomposite. The MD simulation results are substituted into the extended rule of mixtures to derive the related efficiency parameters, which are used as the fundamental inputs in a meshless approach to predict the nonlinear vibration of macroscale functionally graded (FG)-based composite plates. According to the macroscale simulation, it is found that the arrangement of CNTs has a significant influence on the nonlinear vibration of FG-based composite plates. The developed multiscale approach provides an efficient paradigm of investigating the macroscopic behavior of composite structure in consideration of the mechanical response from microscopic constituents. (c) 2020 Elsevier Ltd. All rights reserved.
关键词 ：
Molecular dynamics Molecular dynamics Multiscale modeling Multiscale modeling Nanocomposite Nanocomposite Nonlinear vibration Nonlinear vibration
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| GB/T 7714 | Wang, J. F. , Yang, J. P. , Tam, L. -h. et al. Molecular dynamics-based multiscale nonlinear vibrations of PMMA/CNT composite plates [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2021 , 153 . |
| MLA | Wang, J. F. et al. "Molecular dynamics-based multiscale nonlinear vibrations of PMMA/CNT composite plates" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 153 (2021) . |
| APA | Wang, J. F. , Yang, J. P. , Tam, L. -h. , Zhang, W. . Molecular dynamics-based multiscale nonlinear vibrations of PMMA/CNT composite plates . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2021 , 153 . |
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