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学者姓名：王景甫
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Abstract ：
Green ammonia has become an increasingly popular fuel in recent years because of its combustion process without carbon oxide release. Adding ammonia to methane fuel for co-combustion has become one of the important research topics in the current combustion field. In the present study, the CH4/NH3/Air counterflow diffusion flame was taken as the research object, and Chemkin-2019 R3 software was used to explore and analyze the flame extinction limit and chemical kinetics characteristics under different ammonia mixing ratios, initial pressures, and air preheating temperatures. It was obtained that the flame extinction stretch rate was decreased by increasing the NH3 mole fraction in the CH4/NH3 mixed fuel. The increase in pressure or air preheating temperature would accelerate the chemical reaction rate of each component in the combustion process, increase the flame extinction limit, and counteract the "stretching effect" of the flame, thus restraining the flame extinguishing phenomenon. The results of a path analysis show that the formation and consumption of OH had an important influence on flame extinction in the chain reaction. The net reaction rate of OH increases with increasing the initial pressure or air preheating temperature, which leads to an increase in flame intensity, combustion stability, and the extinction limit. Furthermore, the function curve between the reaction influences the RIF factor and the stretch rate of the first-to-ten reactions, affected by the heat release of flame combustion, was drawn and quantitatively analyzed. Eventually, a sensitivity analysis of the flame under different working conditions was completed, which found that promoting the forward reaction R39 H + O-2<=>O + OH also promotes the positive combustion as a whole when the flame was near extinction. The sensitivity coefficient of R39 in the CH4/NH3/Air flame increases with the growing initial pressure. The increasing air preheating temperature was capable of switching the reaction of R248 NH2 + OH<=>NH + H2O in the CH4/NH3/Air flame from an inhibiting reaction to a promoting reaction, while decreasing the sensitivity coefficient of inhibiting the forward reaction R10 O + CH3<=>H + CH2O, R88 OH + HO2<=>O-2 + H2O, and R271 H + NO + M<=>HNO + M. Thus, the inhibition effect of flame extinction was weakened, and the positive progress of combustion was promoted.
Keyword ：
chemical kinetic characteristics chemical kinetic characteristics extinction limits extinction limits methane/ammonia mixed fuel methane/ammonia mixed fuel counterflow diffusion flame counterflow diffusion flame
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Zhang, Jian et al. Numerical Study on Chemical Kinetic Characteristics of Counterflow Diffusion Flame Extinction of Methane/Ammonia/Air Flame under High Pressure or Air Preheating Temperature [J]. | MOLECULES , 2024 , 29 (15) . |
| MLA | Chen, Ying et al. "Numerical Study on Chemical Kinetic Characteristics of Counterflow Diffusion Flame Extinction of Methane/Ammonia/Air Flame under High Pressure or Air Preheating Temperature" . | MOLECULES 29 . 15 (2024) . |
| APA | Chen, Ying , Wang, Jingfu , Zhang, Jian , Li, Yi . Numerical Study on Chemical Kinetic Characteristics of Counterflow Diffusion Flame Extinction of Methane/Ammonia/Air Flame under High Pressure or Air Preheating Temperature . | MOLECULES , 2024 , 29 (15) . |
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Abstract ：
Extinction limits and flame microstructures of CH4 versus air (N-2/O-2) counterflow diffusion flames with additional CO2 to oxidizer stream under various pressure conditions were numerically investigated by a proposed decoupled strategy. The chemical and thermal effects of CO2 addition were isolated from the synergistic effect on extinction limits and flame microstructures. The results show that the extinction limits were decreased due to the CO2 addition and extended caused by the enhanced pressure, respectively. The changes of flame microstructures from far away from extinction to near extinction mainly are reflected in a narrower combustion zone and thinner flame thickness, while there is no visible displacement of the flame front location. Quantitative analyses manifest the thermal effect of CO2 addition on extinction limit is greater than chemical effect, and elevated pressure can enhance both thermal and chemical effects. An interesting phenomenon occurred between the thermal and chemical effects resulting from increasing CO2 mole fraction in an oxidizer on extinction limit; the former monotonically increase along with CO2 mole fraction, while the latter represents a kind of approximate quadratic-parabola tend along with CO2 mole fraction. The distributions of the production and consumption rate of hydroxyl (OH) radicals were presented to clarify the contribution of the kinetic term in the asymptotic solution to the extinction limits with increasing CO2 molar fraction and various pressures.
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Li, Jianrong et al. A Numerical Study of CO2 Decoupled Effects on Extinction Limit and Flame Microstructure in CH4/Air Counterflow Diffusion Flame with Various Pressures [J]. | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2023 , 2023 . |
| MLA | Chen, Ying et al. "A Numerical Study of CO2 Decoupled Effects on Extinction Limit and Flame Microstructure in CH4/Air Counterflow Diffusion Flame with Various Pressures" . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2023 (2023) . |
| APA | Chen, Ying , Wang, Jingfu , Li, Jianrong , Zhang, Jian . A Numerical Study of CO2 Decoupled Effects on Extinction Limit and Flame Microstructure in CH4/Air Counterflow Diffusion Flame with Various Pressures . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2023 , 2023 . |
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Abstract ：
Delamination is one of the failure modes of functionally graded materials (FGM), resulting in the critical change of vibration characteristics. The Chebyshev polynomials are commonly used as admissible functions to improve the computational efficiency of numerical algorithms and avoid the occurrence of ill-conditioned problems. This paper extends the Chebyshev-Ritz method to the free vibration analysis of delaminated FGM plates, in which the material variation through the plate thickness follows the exponential-law distribution. A plane crack that is considered to be perpendicular to the thickness direction penetrates through the width direction. Based on the region approach, the analysis of FGM plates with a mid-plane delamination is divided into four sub-regions. The kinetic energy and potential energy of each sub-region are derived by the thin plate theory and von Karman nonlinear strain-displacement relation. The modal functions of the displacement fields of FGM plates can be constructed in accordance with the displacement continuity conditions of the delamination interface and the boundary conditions of such plates. The effects of asymmetric material distribution, delamination length ratio, Young's modulus ratio, and boundary support on the vibration behavior of FGM plates are investigated. This semi-analytical study provides a reasonable theoretical basis for the behavior prediction and delamination identification of composite structures.
Keyword ：
FGM plate FGM plate Delamination Delamination Chebyshev polynomials Chebyshev polynomials vibration vibration
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| GB/T 7714 | Wang, J. F. , Cao, G. , Song, Z. W. et al. Dynamic Analysis of FGM Plates with Variable Delamination Parameters by the Chebyshev-Ritz Method [J]. | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2023 , 23 (16N18) . |
| MLA | Wang, J. F. et al. "Dynamic Analysis of FGM Plates with Variable Delamination Parameters by the Chebyshev-Ritz Method" . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 23 . 16N18 (2023) . |
| APA | Wang, J. F. , Cao, G. , Song, Z. W. , Lai, S. K. . Dynamic Analysis of FGM Plates with Variable Delamination Parameters by the Chebyshev-Ritz Method . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2023 , 23 (16N18) . |
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Abstract ：
Structural defects in graphene are inevitable during the production process, which have remarkable impacts on the mechanical properties of graphene and further affect the properties of nanocomposite reinforced by graphene. In this work, a bottom-up multiscale approach is employed to investigate the nonlinear dynamics of defective graphene reinforced composite plates from the material properties of nanocomposites to the dynamic behavior of macro-composite plates. The molecular modeling and simulation are conducted by molecular dynamics (MD) to evaluate the effective mechanical properties of pristine graphene, vacancy defective graphene, Stone-Wales defective graphene, poly (methyl methacrylate) (PMMA) and graphene/PMMA composites reinforced by different graphene configurations at the nano-scale. Meanwhile, the fracture mechanism and interfacial interaction energy between graphene and PMMA matrix during the deformation process are examined to explore the enhancement mechanism of nanocomposites. The efficiency parameters are derived by incorporating the MD results and the extended Halpin-Tsai micromechanics model to capture the heterogeneity of nanocomposite at the nano-scale as well as the continuum scale, and then the effective material properties considering the effect of defect, temperature and pressure are substituted into the nonlinear dynamics of functionally graded graphene reinforced composite (FG-GRC) plates at the macro-scale. The governing equations of motion for FG-GRC plates under the aerodynamic pressure are derived based on the third-order shear deformation theory, von-Karman nonlinear strain-displacement relation and Hamilton's principle. The aerodynamic pressure acting on the surface of the plate consists of two parts, one is the static pressure, and the other is the disturbed air flow. Furthermore, Galerkin method and the fourth-order Runge-Kutta method are exploited to discrete and solve the governing equations of motion. The bifurcation, time history and phase diagrams of FG-GRC plates are obtained to analyze the dynamic characteristics of the plates. This study reveals the nonlinear dynamic characteristics of graphene/PMMA composite plate, which contributes to the prediction of dynamic response of composite structure in the aerospace field.
Keyword ：
Aerodynamic Aerodynamic Efficiency parameter Efficiency parameter Multiscale modeling Multiscale modeling Nonlinear dynamics Nonlinear dynamics Molecular dynamics Molecular dynamics
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| GB/T 7714 | Wang, J. F. , Li, X. L. , Shi, S. Q. et al. Multiscale nonlinear dynamics analysis of defective graphene reinforced PMMA composite plates under aerodynamic pressure [J]. | NONLINEAR DYNAMICS , 2023 , 111 (13) : 11851-11884 . |
| MLA | Wang, J. F. et al. "Multiscale nonlinear dynamics analysis of defective graphene reinforced PMMA composite plates under aerodynamic pressure" . | NONLINEAR DYNAMICS 111 . 13 (2023) : 11851-11884 . |
| APA | Wang, J. F. , Li, X. L. , Shi, S. Q. , Guo, X. Y. . Multiscale nonlinear dynamics analysis of defective graphene reinforced PMMA composite plates under aerodynamic pressure . | NONLINEAR DYNAMICS , 2023 , 111 (13) , 11851-11884 . |
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Abstract ：
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。
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| 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 . |
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Abstract ：
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。
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| 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 . |
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Abstract ：
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。
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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 : 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 . |
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Abstract ：
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.
Keyword ：
Meshless simulation Meshless simulation Molecular dynamics Molecular dynamics CNT composite CNT composite Nonlinear vibration Nonlinear vibration CNT volume fraction CNT volume fraction 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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Abstract ：
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.
Keyword ：
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 . |
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Abstract ：
Purpose In this paper, the nonlinear vibration behavior of functionally graded carbon nanotube reinforced composite (FG-CNTRC) plates is investigated by meshless method. Methods The efficiency parameters, which clearly affect the mechanical properties of the composite materials, are characterized by polynomial expressions for different CNT contents, and applied as the inputs in the vibration analysis of plate structure. Four distributions of CNTs along the thickness of composite plate are considered, namely, the uniform distribution (UD), FG-O, FG-X and FG-V. Based on the classical plate theory and von Karman strain-displacement relation, the governing equations of motion are derived by the virtual displacement principle. Based on the reproducing kernel particle method (RKPM), the discrete governing equations for the vibration of the FG-CNTRC plates are derived. The linearized updated mode (LUM) method is adopted to solve the iteration process of governing equations. Results Numerical results are employed to investigate the effects of boundary condition, aspect ratio, volume fraction and arrangement of CNT on the nonlinear vibration characteristics of composite plates.
Keyword ：
Reproducing kernel particle method Reproducing kernel particle method Efficiency parameter Efficiency parameter Carbon nanotube Carbon nanotube Nonlinear vibration Nonlinear vibration Functionally graded material Functionally graded material
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| GB/T 7714 | Zhang, W. , He, L. J. , Wang, J. F. . Content-Dependent Nonlinear Vibration of Composite Plates Reinforced with Carbon Nanotubes [J]. | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES , 2022 , 10 (4) : 1253-1264 . |
| MLA | Zhang, W. et al. "Content-Dependent Nonlinear Vibration of Composite Plates Reinforced with Carbon Nanotubes" . | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES 10 . 4 (2022) : 1253-1264 . |
| APA | Zhang, W. , He, L. J. , Wang, J. F. . Content-Dependent Nonlinear Vibration of Composite Plates Reinforced with Carbon Nanotubes . | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES , 2022 , 10 (4) , 1253-1264 . |
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