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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 ：
To study the laminar premixed flame characteristics of methane under an O-2/CO2 atmosphere in high pressure, a new simplified chemical mechanism (44 steps and 19 species) was extracted from the GRI-Mech 3.0 mechanism. The sensitivity coefficient analysis method is used to retain the elementary reactions that have great influence on the target parameters and remove other secondary elementary reactions. Meanwhile, the closeness of the simplified mechanism initially obtained was verified. The results of the laminar burning velocities, the distribution of the main species, and the ignition delay time were compared between the two mechanisms for the premixed flame and the ignition process. Overall, the simplified mechanisms performed fairly well over a wide range of pressure, equivalence ratio, and fuel mixture composition.
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Li, Conghao et al. Development and Verification of the New Simplified Mechanism for CH4/O-2/CO2 Laminar Premixed Flame under High Pressure [J]. | ACS OMEGA , 2021 , 6 (29) : 18569-18575 . |
| MLA | Chen, Ying et al. "Development and Verification of the New Simplified Mechanism for CH4/O-2/CO2 Laminar Premixed Flame under High Pressure" . | ACS OMEGA 6 . 29 (2021) : 18569-18575 . |
| APA | Chen, Ying , Wang, Jingfu , Li, Conghao , Zhang, Xiaolei . Development and Verification of the New Simplified Mechanism for CH4/O-2/CO2 Laminar Premixed Flame under High Pressure . | ACS OMEGA , 2021 , 6 (29) , 18569-18575 . |
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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
引用：
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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 ：
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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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 ：
The circulation pump is an important element limiting the development of small-scale Organic Rankine Cycle system which may have a negative efficiency when the power consumption of the pump is considered and if a suitable pump that corresponds to the working fluid is not properly selected. Based on the consideration mentioned above, in this paper, a trapezoid used to represent the power consumption of the pump and a triangle used to represent the degree of subcooling of the working fluid are defined. Using these two models, the perfection of Organic Rankine Cycle at the optimal condensation temperature relative to the Carnot cycle within the same temperature limitation is analyzed when 69 dry and isentropic working fluids are used in Organic Rankine Cycle. The deviation between the real and ideal gas behavior of each working fluid is also obtained. On this basis, the optimal condensation temperature of each dry and isentropic working fluid is determined. Moreover, the applicability of each organic working fluid in Organic Rankine Cycle is discussed from the viewpoint of pump performance. 36 working fluids are suitable and 33 ones not suitable for the application in small-scale Organic Rankine Cycle system. Suitable pump types corresponding to applicable organic working fluids are also analyzed and determined. The graphic method proposed in this paper and the findings about pump performance can provide reference for the operation of practical Organic Rankine Cycle.
关键词 ：
Condensation temperature Condensation temperature Dry fluid Dry fluid Graphic method Graphic method Isentropic fluid Isentropic fluid Organic Rankine Cycle Organic Rankine Cycle Pump performance Pump performance
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| GB/T 7714 | Zhang, Xinxin , Zhang, Yin , Wang, Jingfu . Evaluation and selection of dry and isentropic working fluids based on their pump performance in small-scale organic Rankine cycle [J]. | APPLIED THERMAL ENGINEERING , 2021 , 191 . |
| MLA | Zhang, Xinxin et al. "Evaluation and selection of dry and isentropic working fluids based on their pump performance in small-scale organic Rankine cycle" . | APPLIED THERMAL ENGINEERING 191 (2021) . |
| APA | Zhang, Xinxin , Zhang, Yin , Wang, Jingfu . Evaluation and selection of dry and isentropic working fluids based on their pump performance in small-scale organic Rankine cycle . | APPLIED THERMAL ENGINEERING , 2021 , 191 . |
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摘要 ：
A comprehensive numerical investigation of the uncoupled chemical, thermal, and transport effects of CO2 on the temperature of CH4/O-2 counterflow diffusion flame under high pressure up to 5 atm was conducted. Three pairs of artificial species were introduced to distinguish the chemical effect, thermal effect, and the transport effect of CO2 on the flame temperature. The numerical results showed that both the chemical effect and the thermal effect of the CO2 dilution in the oxidizer side can decrease the flame temperature significantly, while the transport effect of CO2 can only slightly increase the flame temperature and can even be ignored. The reduction value of the temperature caused by the chemical effect of CO2 grows linearly, while that caused by the thermal effect increases exponentially. The RPchem and RPthermal are defined to explain the temperature reduction percentage due to the chemical effect and the thermal effect of CO2 in the total temperature reduction caused by CO2 dilution, respectively. The RPchem decreases with the increase of the pressure, the strain rate, and the CO2 dilution ratio, while the RPthermal thermal behaves in the opposite manner. In the above conditions, the chemical effect plays a dominant role on the flame temperature reduction.
关键词 ：
chemical effect chemical effect CO2 dilution CO2 dilution counterflow flame counterflow flame methane methane thermal effect thermal effect
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei et al. Comparisons of the Uncoupled Effects of CO2 on the CH4/O-2 Counterflow Diffusion Flame under High Pressure [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (4) . |
| MLA | Chen, Ying et al. "Comparisons of the Uncoupled Effects of CO2 on the CH4/O-2 Counterflow Diffusion Flame under High Pressure" . | APPLIED SCIENCES-BASEL 11 . 4 (2021) . |
| APA | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei , Li, Conghao . Comparisons of the Uncoupled Effects of CO2 on the CH4/O-2 Counterflow Diffusion Flame under High Pressure . | APPLIED SCIENCES-BASEL , 2021 , 11 (4) . |
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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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