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学者姓名：王景甫
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摘要 ：
Carbon nanotube (CNT)-reinforced poly (methyl methacrylate) (PMMA) composite is subjected to changing temperature levels when used in aerospace field, which leads to the morphing structure and changing properties, and even structural failure. In this paper, the temperature effect on the structure and properties of PMMA/CNT nanocomposite with different CNT volume fractions is investigated using molecular dynamics (MD) simulation. It is measured that with increasing temperature from 100 to 500 K, the longitudinal, transverse, and shear moduli of PMMA/CNT nanocomposite decrease by 30 %, 45 %, and 62 %, respectively, while the coefficient of thermal expansion (CTE) increases by 27 %. It is found that the atom distribution becomes more dispersed and the nanocomposite structure turns to looser, which lead to the weakened properties of the nanocomposite. Based on the MD results, the efficiency parameters of PMMA/CNT nano -composite are derived using extended rule of mixtures (EROM), which are used to predict the mechanical properties of nanocomposite at different temperatures. The revealed temperature -dependent mechanical properties and the underlying mechanisms contribute to the understand-ing of performance changes of PMMA/CNT nanocomposite under the temperature effect, which provide references for the application of composite materials in the aerospace field where the changing temperatures are of highly concern.
关键词 ：
Mechanical properties Mechanical properties Structural analysis Structural analysis PMMA/CNT nanocomposite PMMA/CNT nanocomposite Temperature effect Temperature effect Molecular dynamics simulation Molecular dynamics simulation
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| GB/T 7714 | Wang, J. F. , Li, P. H. , Tian, X. B. et al. Molecular investigation on temperature-dependent mechanical properties of PMMA/CNT nanocomposite [J]. | ENGINEERING FRACTURE MECHANICS , 2023 , 293 . |
| MLA | Wang, J. F. et al. "Molecular investigation on temperature-dependent mechanical properties of PMMA/CNT nanocomposite" . | ENGINEERING FRACTURE MECHANICS 293 (2023) . |
| APA | Wang, J. F. , Li, P. H. , Tian, X. B. , Shi, S. Q. , Tam, Lik-ho . Molecular investigation on temperature-dependent mechanical properties of PMMA/CNT nanocomposite . | ENGINEERING FRACTURE MECHANICS , 2023 , 293 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Use of ammonia fuel is of particular interest because it does not release carbon dioxide during combustion. However, ammonia flameout is easy to occur in practical applications due to its poor combustion intensity and instability. It has been suggested to mix methane with ammonia to enhance its combustion performance. In this study, the Okafor mechanism was selected as the most suitable detailed chemical reaction mechanism for numerical simulation at normal temperature and pressure (NTP) by comparing and analyzing the extinction stretch rate of pure ammonia with air flame under different reaction mechanisms. The NH3-CH4-air laminar premixed counterflow flame at NTP was numerically studied to reveal variations in flame extinction stretch rate over different conditions. It was obtained that the flame extinction stretch rate was increased by increasing CH4 mole fraction in NH3/CH4 mixed fuel, as expected, and that the flame extinction limit was the greatest under lean burn condition (phi = 0.9). When the extinction limit was achieved and then exceeded, the elementary reactions that significantly contributed to the flame heat release rate at different blending ratios were obtained. By comparing the pathway analysis of double ammonia blending ratios, the elementary reaction and radical associated with addition of methane to ammonia and its effects on the flame extinction characteristics were studied.
关键词 ：
Premixed counterflow flame Premixed counterflow flame Ammonia fuel Ammonia fuel Extinction limits Extinction limits Mechanism verification Mechanism verification
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| GB/T 7714 | Zhang, Jian , Wang, Jingfu , Chen, Ying et al. Numerical study on extinction characteristics of counterflow flame in premixed NH3/CH4/air mixtures under normal temperature and pressure [J]. | FUEL , 2023 , 334 . |
| MLA | Zhang, Jian et al. "Numerical study on extinction characteristics of counterflow flame in premixed NH3/CH4/air mixtures under normal temperature and pressure" . | FUEL 334 (2023) . |
| APA | Zhang, Jian , Wang, Jingfu , Chen, Ying , Li, Conghao . Numerical study on extinction characteristics of counterflow flame in premixed NH3/CH4/air mixtures under normal temperature and pressure . | FUEL , 2023 , 334 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Owing to the excellent mechanical properties, polymethyl methacrylate (PMMA)/carbon nanotube (CNT) composite has been increasingly adopted in the aerospace field, which is usually subjected to various temperature conditions and supersonic aerodynamic loads. Using a molecular dynamics (MD)-based multiscale simulation, the nonlinear forced vibration of PMMA/CNT composite plate is investigated under coupled temperature and aerodynamic load conditions. The longitudinal, transverse and shear moduli of PMMA/single-walled CNT (SWCNT) nanocomposite obtained from MD simulation at different temperature and pressure levels are substituted into the extended rule of mixtures to establish the constitutive equations of PMMA/CNT composite plate. Meanwhile, Poisson's ratio and thermal expansion coefficient of nanocomposite are used in the constitutive equations. Based on the third-order shear deformation theory, von Karman nonlinear strain-displacement relation and Hamilton's principle, the partial differential equation of composite plate is derived, which is reduced into a set of coupled ordinary differential equations by applying Galerkin method and is solved using the fourth-order Runge-Kutta method. The bifurcation diagrams, phase portraits, time histories and Poincare maps of composite plate are obtained under the complex loads including transverse harmonic excitation and aerodynamic pressure, which are applied to analyze the dynamic characteristics of system. This study reveals the nonlinear dynamic characteristics of PMMA/CNT composite plate, which contributes to the prediction of long-term performance of composite materials in aerospace field.
关键词 ：
Nonlinear dynamics Nonlinear dynamics Efficiency parameter Efficiency parameter Aerodynamic Aerodynamic Composite structure Composite structure Multiscale simulation Multiscale simulation
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| GB/T 7714 | Wang, J. F. , Shi, S. Q. , Liu, Y. Z. et al. Multiscale simulation of temperature- and pressure-dependent nonlinear dynamics of PMMA/CNT composite plates [J]. | NONLINEAR DYNAMICS , 2022 , 109 (3) : 1517-1550 . |
| MLA | Wang, J. F. et al. "Multiscale simulation of temperature- and pressure-dependent nonlinear dynamics of PMMA/CNT composite plates" . | NONLINEAR DYNAMICS 109 . 3 (2022) : 1517-1550 . |
| APA | Wang, J. F. , Shi, S. Q. , Liu, Y. Z. , Yang, J. P. , Tam, Lik-ho . Multiscale simulation of temperature- and pressure-dependent nonlinear dynamics of PMMA/CNT composite plates . | NONLINEAR DYNAMICS , 2022 , 109 (3) , 1517-1550 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
一种喷流波纹管式污泥干化装置，涉及干燥设备技术相关领域。所述的装置主仓体由干燥桶和加热套筒两个部分所构成，干燥桶壁面前段为波纹管状，后段为圆筒状，在干燥桶内部设有横向旋转轴和搅拌桨，桨叶均匀分布在旋转轴前段，旋转轴带动桨叶旋转，将污泥甩到干燥桶壁面上，并带动污泥向右运动，干化装置主仓体左侧设置了进料口以及热空气入口，干化装置主仓体右侧设置了出料口以及湿空气出口。前段壁面为波纹管状，增加了以薄膜式进行干化的污泥与热壁的单位长度接触面积，波纹管周期性结构引发二次流，强化了换热；热介质从喷嘴高速喷向波纹管壁面实现强化换热，并使得波纹管壁温沿长度方向保持基本恒定，提高污泥干化效率与产率。
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 王景甫 , 肖楚轩 , 王苡帆 et al. 一种喷流波纹管式污泥干化装置 : CN202211119714.5[P]. | 2022-09-15 . |
| MLA | 王景甫 et al. "一种喷流波纹管式污泥干化装置" : CN202211119714.5. | 2022-09-15 . |
| APA | 王景甫 , 肖楚轩 , 王苡帆 , 陈颖 , 王泽鑫 . 一种喷流波纹管式污泥干化装置 : CN202211119714.5. | 2022-09-15 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明公开了一种LNG气化及冷能发电利用系统，该系统由LNG气化子系统和LNG冷能发电子系统构成。LNG气化子系统主要由LNG一级气化器和二级气化器构成。在LNG一级气化器中，该气化器采用套管设计，在管内LNG侧采用喷淋管，将LNG喷淋在套管中，强化LNG与饱和有机工质的换热；在LNG二级气化器中，在有机工质侧加装肋片，强化有机工质湿蒸汽与管内LNG的换热。通过两级LNG气化器，分别对换热的弱侧进行了强化，充分利用了LNG的冷能，提高了冷能利用率和换热效率。在LNG冷能发电系统中，以LNG冷能作为冷源，以海水作为热源，采用有机朗肯循环发电系统进行发电。为了更好的满足用气需求，在系统的末端设置了一套槽式太阳能集热系统。
引用：
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| GB/T 7714 | 王景甫 , 王苡帆 . 一种LNG气化及冷能发电利用系统 : CN202211086339.9[P]. | 2022-09-07 . |
| MLA | 王景甫 et al. "一种LNG气化及冷能发电利用系统" : CN202211086339.9. | 2022-09-07 . |
| APA | 王景甫 , 王苡帆 . 一种LNG气化及冷能发电利用系统 : CN202211086339.9. | 2022-09-07 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明提供了一种分级LNG气化器结构，该气化器主要应用于LNG有机朗肯循环发电过程中，其主要由一级气化器和二级气化器组合而成。根据气化器内LNG与有机工质所处的不同状态，分别对两级气化器的结构进行设计，一级气化器由壳体和内部的套管组成，内部套管的内管采用喷淋管道，套管的外管采用花瓣状管道；二级气化器由壳体和内部管道组成，在壳体内表面和管道外表面均匀布置有环状肋片。该气化器的优势在于，根据LNG和有机工质所处的不同换热阶段，对不同的换热侧进行强化，通过这种方式来提高气化器的气化效率，具有结构简单、换热效率高的特点。本发明的LNG气化器的结构提高了换热效率，节省占地面积。
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 王景甫 , 王苡帆 . 一种分级LNG气化器结构 : CN202211086362.8[P]. | 2022-09-07 . |
| MLA | 王景甫 et al. "一种分级LNG气化器结构" : CN202211086362.8. | 2022-09-07 . |
| APA | 王景甫 , 王苡帆 . 一种分级LNG气化器结构 : CN202211086362.8. | 2022-09-07 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本实用新型提供了一种分级LNG气化器结构，该气化器主要应用于LNG有机朗肯循环发电过程中，其主要由一级气化器和二级气化器组合而成。根据气化器内LNG与有机工质所处的不同状态，分别对两级气化器的结构进行设计，一级气化器由壳体和内部的套管组成，内部套管的内管采用喷淋管道，套管的外管采用花瓣状管道；二级气化器由壳体和内部管道组成，在壳体内表面和管道外表面均匀布置有环状肋片。该气化器的优势在于，根据LNG和有机工质所处的不同换热阶段，对不同的换热侧进行强化，通过这种方式来提高气化器的气化效率，具有结构简单、换热效率高的特点。本实用新型的LNG气化器的结构提高了换热效率，节省占地面积。
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 王景甫 , 王苡帆 . 一种分级LNG气化器结构 : CN202222366646.4[P]. | 2022-09-07 . |
| MLA | 王景甫 et al. "一种分级LNG气化器结构" : CN202222366646.4. | 2022-09-07 . |
| APA | 王景甫 , 王苡帆 . 一种分级LNG气化器结构 : CN202222366646.4. | 2022-09-07 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本实用新型公开了一种LNG气化及冷能发电利用系统，该系统由LNG气化子系统和LNG冷能发电子系统构成。LNG气化子系统主要由LNG一级气化器和二级气化器构成。在LNG一级气化器中，该气化器采用套管设计，在管内LNG侧采用喷淋管，将LNG喷淋在套管中，强化LNG与饱和有机工质的换热；在LNG二级气化器中，在有机工质侧加装肋片，强化有机工质湿蒸汽与管内LNG的换热。通过两级LNG气化器，分别对换热的弱侧进行了强化，充分利用了LNG的冷能，提高了冷能利用率和换热效率。在LNG冷能发电系统中，以LNG冷能作为冷源，以海水作为热源，采用有机朗肯循环发电系统进行发电。为了更好的满足用气需求，在系统的末端设置了一套槽式太阳能集热系统。
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 王景甫 , 王苡帆 . 一种LNG气化及冷能发电利用系统 : CN202222366610.6[P]. | 2022-09-07 . |
| MLA | 王景甫 et al. "一种LNG气化及冷能发电利用系统" : CN202222366610.6. | 2022-09-07 . |
| APA | 王景甫 , 王苡帆 . 一种LNG气化及冷能发电利用系统 : CN202222366610.6. | 2022-09-07 . |
| 导入链接 | NoteExpress RIS BibTex |
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 ：
Meshless simulation Meshless simulation Molecular dynamics Molecular dynamics CNT composite CNT composite Nonlinear vibration Nonlinear vibration CNT volume fraction CNT volume fraction PMMA PMMA
引用：
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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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
一种喷流波纹管式污泥干化装置，涉及干燥设备技术相关领域。所述的装置主仓体由干燥桶和加热套筒两个部分所构成，干燥桶壁面前段为波纹管状，后段为圆筒状，在干燥桶内部设有横向旋转轴和搅拌桨，桨叶均匀分布在旋转轴前段，旋转轴带动桨叶旋转，将污泥甩到干燥桶壁面上，并带动污泥向右运动，干化装置主仓体左侧设置了进料口以及热空气入口，干化装置主仓体右侧设置了出料口以及湿空气出口。前段壁面为波纹管状，增加了以薄膜式进行干化的污泥与热壁的单位长度接触面积，波纹管周期性结构引发二次流，强化了换热；热介质从喷嘴高速喷向波纹管壁面实现强化换热，并使得波纹管壁温沿长度方向保持基本恒定，提高污泥干化效率与产率。
引用：
复制并粘贴一种已设定好的引用格式，或利用其中一个链接导入到文献管理软件中。
| GB/T 7714 | 王景甫 , 肖楚轩 , 王苡帆 et al. 一种喷流波纹管式污泥干化装置 : CN202222437914.7[P]. | 2022-09-15 . |
| MLA | 王景甫 et al. "一种喷流波纹管式污泥干化装置" : CN202222437914.7. | 2022-09-15 . |
| APA | 王景甫 , 肖楚轩 , 王苡帆 , 陈颖 , 王泽鑫 . 一种喷流波纹管式污泥干化装置 : CN202222437914.7. | 2022-09-15 . |
| 导入链接 | NoteExpress RIS BibTex |
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