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第三届中国国际透平机械学术会议

作者： Yu-jing Wu Dian-gui Huang School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai Key Laboratory of Power Energy in Multiphase Flow and Heat Transfer

An airfoil series consisting of 8 airfoils are obtained through the optimization design method which aimed to the lift drag *** new airfoil serie is used to construct the blade,the chord length and installation angle of the blade along the blade height are optimized by using orthogonal optimization method,meanwhile,three design options of straight blades,C-type blades and forward swept blade are provided in this *** a axial fan as the research object,the whole 3D numerical simulation was conducted by using *** axial fans with three kinds of blades are respectively discussed and compared under design and off-design *** show that under design conditions,the full pressure efficiency of the axial flow fan with the forward swept blade is the highest,and the C-type blade has slightly lower efficiency and the straight blade has the lowest *** off-design conditions,the aerodynamic performance of the forward-swept balde and C-type blade fans are better than that of the straightblade fans.

关键词： Axial Fan Forward Swept Blade C-type Blade 3D Design

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Experimental and kinetic study on ignition delay times of 2, 5-DMF/n-heptane blends 9

Experimental and kinetic study on ignition delay times of 2,...

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9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017

作者： Hu, Erjiang Gao, Zhenhua Ku, Jinfeng Meng, Xin Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Ignition delay times of 2, 5-dimethylfuran(2, 5-DMF)/n-heptane/oxygen/argon mixtures were measured in this study. Experiments were performed at the stoichiometric mixtures in the temperature range of 1200-1800K. A blend model for 2, 5-DMF/n-heptane blends was developed by combining two selected models for each individual fuel component. According to the combined model, the ignition delay time increases with an increase in the 2, 5-DMF addition level, non-linearly. Kinetic analysis was conducted to investigate interaction effects between two fuels. At relatively low blending ratios of 2, 5-DMF, the two fuels have negligible impacts on the reaction path of each other. As the 2, 5-DMF addition increases to relatively higher levels, decomposition path of n-heptane is significantly changed due to the competition for small radical. Copyright © 2017 by the Japan Society of Mechanical Engineers.

关键词： Heptane

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Numerical analysis of the static performance of an annular aerostatic gas thrust bearing applied in the cryogenic turbo-expander of the EAST subsystem

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Plasma Science and Technology 2017年第2期19卷 115-122页

作者： Tianwei LAI Bao FU Shuangtao CHEN Qiyong ZHANG Yu HOU State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong University Xi＇an 710049 People＇s Republic of China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People＇s Republic of China

The EAST superconducting tokamak, an advanced steady-state plasma physics experimental device, has been built at the Institute of Plasma Physics, Chinese Academy of Sciences. All the toroidal field magnets and poloidal field magnets, made of NbTi/Cu cable-in-conduit conductor, are cooled with forced flow supercritical helium at 3.8 K. The cryogenic system of EAST consists of a 2 kW/4 K helium refrigerator and a helium distribution system for the cooling of coils, structures, thermal shields, bus-lines, etc. The high-speed turbo-expander is an important refrigerating component of the EAST cryogenic system. In the turbo-expander, the axial supporting technology is critical for the smooth operation of the rotor bearing system. In this paper, hydrostatic thrust bearings are designed based on the axial load of the turbo-expander. Thereafter, a computational fluid dynamics-based numerical model of the aerostatic thrust bearing is set up to evaluate the bearing performance. Tilting effect on the pressure distribution and bearing load is analyzed for the thrust beating. Bearing load and stiffness are compared with different static supply pressures. The net force from the thrust bearings can be calculated for different combinations of bearing clearance and supply pressure.

关键词： EAST helium cryogenic system aerostatic thrust beating inclination bearing load

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Inside Back Cover: Volume 2 Issue 2

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SmartMat 2021年第2期2卷

作者： Niuwa Yang Dong Chen Penglei Cui Tingyu Lu Hui Liu Chaoquan Hu Lin Xu Jun Yang State Key Laboratory of Multiphase Complex Systems Chinese Academy of Sciences Beijing China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China Nanjing IPE Institute of Green Manufacturing Industry Nanjing Jiangsu China Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials Science Nanjing Normal University Nanjing Jiangsu China Lin Xu School of Chemistry and Materials Science Jiangsu Key Laboratory of New Power Batteries Nanjing Normal University Nanjing 210023 Jiangsu China.

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Theoretical insights into the hydrophobicity of low index CeO2 surfaces

arXiv

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arXiv 2019年

作者： Fronzi, Marco N. Assadi, M. Hussein Hanaor, Dorian A.H. International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’anShaanxi710049 China 1-1 Namiki TsukubaIbaraki305-0044 Japan Chair of Advanced Ceramic Materials Institute for Materials Science and Technology Technische Universität Berlin Berlin10653 Germany

The hydrophobicity of CeO2 surfaces is examined here. Since wettability measurements are extremely sensitive to experimental conditions, we propose a general approach to obtain contact angles between water and ceria surfaces of specified orientations based on density functional calculations. In particular, we analysed the low index surfaces of this oxide to establish their interactions with water. According to our calculations, the CeO2 (111) surface was the most hydrophobic with a contact angle of Θ = 112.53° followed by (100) with Θ = 93.91°. The CeO2 (110) surface was, on the other hand, mildly hydrophilic with Θ = 64.09°. By combining our calculations with an atomistic thermodynamic approach, we found that the O terminated (100) surface was unstable unless fully covered by molecularly adsorbed water. We also identified a strong attractive interaction between the hydrogen atoms in water molecules and surface oxygen, which gives rise to the hydrophilic behaviour of (110) surfaces. Interestingly, the adsorption of water molecules on the lower-energy (111) surface stabilises oxygen vacancies, which are expected to enhance the catalytic activity of this plane. The findings here shed light on the origin of the intrinsic wettability of rare earth oxides in general and CeO2 surfaces in particular and also explain why CeO2 (100) surface properties are so critically dependant on applied synthesis methods. Copyright © 2019, The Authors. All rights reserved.

关键词： Density functional theory

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flow CONTROL EFFECT OF MICRO-CYLINDERS WITH DIFFERENT VIBRATION REGULATIONS ON HORIZONTAL AXIS WIND TURBINE

FLOW CONTROL EFFECT OF MICRO-CYLINDERS WITH DIFFERENT VIBRAT...

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第三届中国国际透平机械学术会议

作者： Ying Wang Gao-hui Li Sheng Shen Dian-gui Huang School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai200093 Shanghai key laboratory of multiphase flow and heat transfer of power engineering Shanghai200093

According to the flow separation of NREL Phase VI horizontal axis wind turbine blade,a new flow control method installing vibration micro-cylinder in front of the blade leading edge is *** to the actual flow condition,the fluid solid coupling simulation is conducted where two kinds of micro-cylinder vibration modes are set up,and the aerodynamic performance is numerically *** influence of vibration modes and vibration amplitude and frequency on the aerodynamic performance of horizontal axis wind turbine is *** results suggest that in the case of different stall conditions,by setting appropriate vibration micro-cylinder can effectively suppress the flow separation on wind turbine blades than installing static ***,the vibration micro-cylinder also shows obvious suppressing effect on large flow *** U∞≥13m/s,the vibration direction and vibration amplitude plays a leading role in the improvement of aerodynamic performance,and a micro-cylinder with high vibration frequency can suppress surface flow separation more quickly to achieve the optimum aerodynamic *** on calculation,when U∞=10~25m/s,by setting micro-cylinders which are close to the blade surface with suitable vibration rules,the wind energy coefficient can show increase of 86.2%,188.4%,214.1%,109.8%和120.2%,respectively,compared with those of adding static micro-cylinder or without adding micro-cylinder.

关键词： Horizontal axis wind turbine vibration micro-cylinders flow control Aerodynamic performance

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Theoretical analyses of the sub-grid quantities' effect on filtered eulerian drag force

arXiv

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arXiv 2018年

作者： Chen, Xiao Jiang, Ming Zhou, Qiang State Key Laboratory of Multiphase Flow in Power Engineering Xian Jiaotong University Xian710049 China School of Chemical Engineering and Technology Xian Jiaotong University Xian710049 China

An expression of the filtered Eulerian drag force is proposed based on the second order Taylor polynomial approximation of the microscopic Eulerian drag coefficient. Theoretical computations of the expression are performed at low Reynolds numbers based on an available microscopic drag model. It shows that four sub-grid quantities, i.e., the gas drift velocity, the solid drift velocity, the scalar variance of solid volume fraction and a third-order moment, defined as the covariance of squared solid volume fraction and the slip velocity, are significant for an accurate estimation of the filtered drag force at low Reynolds numbers. The gas drift velocity is nothing but the drift velocity defined by Parmentier et al. (AIChE Journal, 2012, 58 (4): 1084-1098), and in analogy to the gas drift velocity, we defines the solid drift velocity in the present work. The great relevance of the gas drift velocity and the scalar variance of solid volume fraction to the filtered drag force have been demonstrated through numerous correlative analyses of fully resolved simulations. Present theoretical analysis shows that the gas drift velocity term is primarily responsible for the drag reduction, whereas the solid drift velocity term is prone to attenuate this reduction, especially at moderate and high solid volume fractions. The scalar variance of solid volume fraction term is found to increase the filtered drag force in the full range of solid volume fractions. The third-order term has exactly the same coefficient with that of the variance term, and it mostly attains negative values with the trend to decrease the filtered drag force. Copyright © 2018, The Authors. All rights reserved.

关键词： Drag

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Transport equation for the drift velocity in predicting the filtered Eulerian drag force: A theoretical development

arXiv

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arXiv 2018年

作者： Chen, Xiao Jiang, Ming Zhou, Qiang School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The drift velocity has been proven to have significant relevance to the filtered Eulerian drag force by numerous correlative analyses of fully resolved simulations. It is a sub-grid quantity defined as the difference between the filtered gas velocity seen by the particle phase and the resolved filtered gas velocity. In literature, it is shown that various algebraic models for the drift velocity fail to give entirely satisfactory prediction of the filtered drag force. Unlike previous works, we theoretically derived the transport equation for the drift velocity from the standard two-fluid model (TFM) equations without any additional assumptions. The new approach, though requires additional closures for the new unresolved terms, is believed to have the potential to improve the precision of the estimation of this sub-grid quantity and hence give better prediction of the filtered drag force for gas-solid fluidization problems. Copyright © 2018, The Authors. All rights reserved.

关键词： Drag

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Microstructure and properties of CrAl/CrAlBN-coated TiCN-based cermet under different plasma pretreatments

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Ceramics International 2025年

作者： Cheng chen Honglin Li Qingfang Yun Jianfeng Zhao Taijun He Dong Yang Han Chen Hengning Hu Wei Li Qingxian Li Wei Wang Qianbing You Zhixing Guo Junbo Liu Ji Xiong School of Mechanical Engineering Sichuan University Chengdu 610065 PR China Chengdu Tool Research Institute Co. Ltd Chengdu 610065 PR China Dongfang Turbine Co. Ltd Deyang 618000 PR China AVIC Chengdu Aircraft Industrial (Group) CO. LTD. 610092 PR China Sichuan SUC Flow Control Equipment Co. Ltd Chengdu 610207 PR China Department of R&D Pengxi Heye high-tech Co. Ltd. Suining 629000 PR China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Deyang 618000 PR China Sichuan Railway College Chengdu 611732 PR China

Abstrate The sequence of plasma etching and nitriding critically determines nitrided layer thickness and final coating performance. To validate the dual functionality of plasma etching and nitriding, and identify optimal plasma pretreatments for CrAl/CrAlBN-coated TiCN cermet, four plasma pretreatments, including argon (Ar) ion etching (AE), Ar + nitrogen (N 2 ) mixture etching (ME), and their combinations (AE + ME and ME + AE), were applied to TiCN-based cermet substrates, followed by coating deposition. Techniques such as XRD, EPMA, EBSD and TEM were employed to analyze the structure and properties of the substrates and coatings. The results indicate that a nitrogen-rich layer of 1.3 μm thickness forms after ME, while the AE + ME treatment increases the layer thickness to 1.6 μm. The removal of the nitrogen-rich layer increased the lattice mismatch between the substrate and coating from 3.7 % (ME) to 4.4 % (ME + AE), accompanied by a transition in the coating's preferred orientation from (111) to (200). Finally, the optimal etching process is ME. The ME-coated sample achieved optimal hardness (38.4 ± 0.6 GPa), H/E ratio (0.082), and cohesive strength (134 ± 3 N), with superior wear resistance (COF: 0.45 ± 0.029; wear rate: 8.2 ± 0.37 × 10 −6 mm 3 N −1 m −1 ).

关键词：

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A High-Performance VS2-Modifed Separator for Lithium–Sulfur Batteries

A High-Performance VS2-Modifed Separator for Lithium–Sulfur...

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中国化学会第三届中国能源材料化学研讨会

作者： Jianan Wang Guorui Yang Shanshan Yi Ling Wang Silan Wang Wei Yan Shujiang Ding Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong University Department of Applied Chemistry School of ScienceState Key Laboratory for Electrical Insulation and Power EquipmentXi'an Jiaotong Univrsity School of Electronic and Information Engineering Xi'an Jiaotong University

Lithium–sulfur（Li-S） batteries are a promising candidate to couple renewable energy sources for green transportation and large-scale energy storage because of their relatively low cost and high theoretical specific capacity(1,675 mA h g).However,a major problem preventing the practical applications of Li-S batteries is the rapid capacity fading,predominantly due to the "shuttle effect" of polysulphides（LiPSs）.

关键词： A High-Performance VS2-Modifed Separator for Lithium Sulfur Batteries

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