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Characterization of H2-air detonations with high-speed (2.5 MHz) Rayleigh scattering and single-shot planar laser-induced fluorescence of nitric oxide

Characterization of H2-air detonations with high-speed (2.5 ...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Chatelain, Karl P. Alicherif, Mhedine Guiberti, Thibault F. Lacoste, Deanna A. Mechanical Engineering Program Physical Science and Engineering Division PO box 4700 Thuwal23955-6900 Saudi Arabia

ISBN: (纸本)9781624107238

This study characterizes a CJ hydrogen-air detonation using high-speed Rayleigh scattering and single-shot planar laser-induced fluorescence of nitric oxide (NO-PLIF). Firstly, we demonstrate that a Nd:YAG laser cluster can be employed to conduct high-speed Rayleigh scattering visualizations of hydrogen-air detonations at 25 kPa, achieving effective visualization frequencies of 2.5MHz in this study. This multipulse Rayleigh scattering diagnostic is complementary to the existing techniques: (i) it enables the characterization of any detonation, from CJ detonations in large aspect ratio channel to marginal detonations in narrow channels;(ii) it is significantly less expensive than typical burst-mode lasers;(iii) it has adjustable visualization frequency, which can go beyond 10MHz with the same energy per pulse. This makes this diagnostic even more suitable for high-pressure detonations or for undiluted conditions, where structures are smaller and detonations faster, respectively;(iv) it is easily applicable to higher initial pressures since the Rayleigh signal scales with number density. Secondly, we combine this multipulse Rayleigh scattering with NO-PLIF to complement the average speed and speed decay measurements with local induction zone length (δi) measurements. This five-beam configuration provides measurement capabilities similar to our previous three beam configuration, outside of the local speed decay. Furthermore, an experimental and numerical assessment reveals that δi measurements cannot be achieved from Rayleigh scattering, as they are significantly underestimated—by approximately 25%—compared to those from NO-PLIF. Hence, NO-PLIF is recommended over Rayleigh scattering for accurate δi measurements in future studies. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Rayleigh scattering

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Wear Properties of Spark Plasma‑Sintered AlCoCrFeNi2.1 Eutectic High Entropy Alloy with NbC Additions

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Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 987-998页

作者： Hui Jiang Li Li Jianming Wang Chengbin Wei Qiang Zhang Chunjian Su Huaiming Sui College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China College of Electromechanical Engineering Qingdao University of Science&TechnologyQingdao 266061China Yangzhou Fengming Photoelectric New Material Co.Ltd Yangzhou 225000China

AlCoCrFeNi_(2.1-x)NbC(x=0,2.5,7.5,and 10 wt%,denoted as NbC0,NbC2.5,NbC7.5,and NbC10)high-entropy alloy(HEA)matrix composites were fabricated by mechanical alloying(MA)and spark plasma sintering(SPS)*** effect of NbC content on the microstructures,Vickers hardness,and wear properties of AlCoCrFeNi_(2.1) eutectic high entropy alloy(EHEA)was systematically *** results indicate that the AlCoCrFeNi_(2.1) alloy consisted of FCC,B2,Al_(2)O_(3),and Cr_(7)C_(3) phases,while the AlCoCrFeNi_(2.1-x)NbC(x>0)alloys consisted of FCC,NbC,Al_(2)O_(3),and Cr_(7)C_(3) *** AlCoCrFeNi_(2.1-x)NbC alloys exhibit excellent Vickers hardness with 679 HV,664 HV,677 HV,and 695 HV,*** addition,with the addition of NbC,the average friction coefficient and wear rate of the AlCoCrFeNi_(2.1)-xNbC alloys decrease from 0.59 to 0.42 and from 1.5.10–5 mm^(3) N^(−1) m^(−1) to 2.4.10–6 mm^(3) N^(−1) m^(−1),***,NbC10 alloy shows the smallest average friction coefficient of 0.42 and lowest wear rate of 2.4.10–6 mm^(3) N^(−1) m^(−1),indicating that the NbC10 alloy displays the best wear *** the wear mechanism of the NbC10 alloy was oxidation wear accompanied by slight adhesive wear.

关键词： Eutectic High entropy alloy Microstructures Vickers hardness Wear property

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(FeO)_(2)FeBO_(3) nanoparticles attached on interconnected nitrogen-doped carbon nanosheets serving as sulfur hosts for lithium-sulfur batteries

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Frontiers of materials science 2024年第2期18卷 75-88页

作者： Junhai Wang Huaqiu Huang Chen Chen Jiandong Zheng Yaxian Cao Sang Woo Joo Jiarui Huang School of Material and Chemical Engineering Chuzhou UniversityChuzhou 239000China College of Mechanical Engineering Tongling UniversityTongling 244000China Key Laboratory of Functional Molecular Solids of the Ministry of Education College of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China School of Mechanical Engineering Yeungnam UniversityGyeongsanGyeongbuk 38541Republic of Korea

There are still many challenges including low conductivity of cathodes,shuttle effect of polysulfides,and significant volume change of sulfur during cycling to be solved before practical applications of lithium-sulfur(Li-S)*** this work,(FeO)_(2)FeBO_(3) nanoparticles(NPs)anchored on interconnected nitrogen-doped carbon nanosheets(NcNs)were synthesized,serving as sulfur carriers for Li-S batteries to solve such *** have the cross-linked network structure,which possess good electrical conductivity,large specific surface area,and abundant micropores and mesopores,enabling the cathode to be well infiltrated and permeated by the electrolyte,ensuring the rapid electron/ion transfer,and alleviating the volume expansion during the electrochemical *** addition,polar(FeO)_(2)FeBO_(3) can enhance the adsorption of polysulfides,effectively alleviating the polysulfide shuttle *** a current density of 1.0 A·g^(-1),the initial discharging and charging specific capacities of the(FeO)_(2)FeBO_(3)@NCNs-2/S electrode were obtained to be 1113.2 and 1098.3mA·h·g^(-1),*** 1000 cycles,its capacity maintained at 436.8 mA·h·g^(-1),displaying a decay rate of 0.08%per ***,combining NCNs with(FeO)_(2)FeBO_(3) NPs is conducive to the performance improvement of Li-S batteries.

关键词： (FeO)_(2)FeBO_(3) nitrogen-doped carbon nanosheet cathode lithium-sulfurbattery

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Enhanced initial biodegradation resistance of the biomedical Mg-Cu alloy by surface nanomodification

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Journal of Magnesium and Alloys 2023年第8期11卷 2776-2788页

作者： Wen Zhang Ming-Chun Zhao Zhenbo Wang Lili Tan Yingwei Qi Deng-Feng Yin Ke Yang Andrej Atrens School of Material Science and Engineering Central South UniversityChangsha 410083China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of mechanical and Mining Engineering University of QueenslandBrisbaneQLD 4072Australia

Mg-Cu alloys are promising antibacterial implant ***,their clinical applications have been impeded by their high initial biodegradation rate,which can be alleviated using nanotechnology by for example surface nanomodification to obtain a gradient nanostructured surface *** present work(i)produced a gradient nanostructured surface layer with a∼500µm thickness on a Mg-0.2 Cu alloy by a surface mechanical grinding treatment(SMGT),and(ii)studied the biodegradation behavior in Hank's *** initial biodegradation rate of the SMGTed samples was significantly lower than that of the unSMGTed original counterparts,which was attributed to the surface nanocrystallization,and the fragmentation and re-dissolution of Mg_(2)Cu particles in the surface of the SMGTed Mg-0.2 Cu ***,the SMGTed Mg-0.2 Cu alloy had good antibacterial *** work creatively used SMGT technology to produce a high-performance Mg alloy implant material.

关键词： Mg-Cu alloy Gradient nanostructure Biodegradation Surface mechanical grinding treatment

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Ultrathin damage-tolerant flexible metal interconnects reinforced by in-situ graphene synthesis

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npj Flexible Electronics 2024年第1期8卷 793-802页

作者： Kaihao Zhang Mitisha Surana Jad Yaacoub Sameh Tawfick University of Illinois Urbana Champaign Mechanical Science and EngineeringChampaignIL 61801USA The Hong Kong University of Science and Technology(Guangzhou) Smart Manufacturing ThrustNanshaGuangzhou511453 GuangdongChina The Hong Kong University of Science and Technology Mechanical and Aerospace EngineeringSai KungHong Kong SARChina University of Illinois Urbana Champaign Material Science and EngineeringChampaignIL 61801USA

Conductive patterned metal films bonded to compliant elastomeric substrates form meshes which enable flexible electronic interconnects for various ***,while bottom-up deposition of thin films by sputtering or growth is well-developed for rigid electronics,maintaining good electrical conductivity in sub-micron thin metal films upon large deformations or cyclic loading remains a significant ***,we propose a strategy to improve the electromechanical performance of nanometer-thin palladium films by in-situ synthesis of a conformal graphene coating using chemical vapor deposition(CVD).The uniform graphene coverage improves the thin film’s damage tolerance,electro-mechanical fatigue,and fracture toughness owing to the high stiffness of graphene and the conformal CVD-grown graphene-metal ***-coated Pd thin film interconnects exhibit stable increase in electrical resistance even when strained beyond 60%and longer fatigue life up to a strain range of20%.The effect of graphene is more significant for thinner films of<300 nm,particularly at high *** experimental observations are well described by the thin film electro-fragmentationmodel and the Coffin-Manson *** findings demonstrate the potential of CVD-grown graphene nanocomposite materials in improving the damage tolerance and electromechanical robustness of flexible *** proposed approach offers opportunities for the development of reliable and high-performance ultra-conformable flexible electronic devices.

关键词： damage synthesis conformal

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Ultra-flexible graphene/nylon/PDMS coaxial fiber-shaped multifunctional sensor

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Nano Research 2023年第4期16卷 5541-5547页

作者： Peddathimula Puneetha Siva Pratap Reddy Mallem Sung Cheol Park Seoha Kim Dong Hun Heo Cheol Min Kim Jaesool Shim Sung Jin An Dong-Yeon Lee Kwi-Il Park Department of Robotics and Intelligent Machine Engineering/College of Mechanical and IT Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Advanced Material Research Center Kumoh National Institute of TechnologyGumi 39177Republic of Korea School of Mechanical Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea Department of Materials Science and Engineering Kumoh National Institute of TechnologyGumi 39177Republic of Korea

The development of flexible and wearable devices is mainly required for tactile sensing;as such devices can adapt to complicated nonuniform surfaces,they can be applied to the human ***,it remains necessary to simultaneously achieve small-scale,portable,and stable developments in such ***,this work aims at fabricating a novel,lightweight,ultra-flexible,and fiber-shaped coaxial structure with a diameter of 0.51 mm using polydimethylsiloxane/graphene/nylon material,based on piezoresistive and triboelectric *** piezoresistive-based robotic-hand-controlled sensor thus realized exhibits a response time of 120 ms and a fast recovery time of 55 ***,the piezoresistive-based sensors effectively feature whisker/joystick-guided behaviors and also sense the human finger *** to the triboelectric-based selfpowered nanogenerator behavior,the resulting sensor can convert mechanical motion into electrical energy,without adversely affecting human ***,this triboelectric-based human finger sensor can be operated under different bending modes at specific ***,this multifunctional sensor is cost-effective and suitable for various applications,including robotichand-controlled operations in medical surgery,whisker/joystick motions in lightweight drone technology,and navigation with highsensitivity components.

关键词： extremely lightweight ultra-flexible piezoresistive/triboelectric sensor human-machine whisker

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Large eddy simulation of partially-premixed O2–H2 combustion with steam dilution in multi-cluster jet

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International Journal of Hydrogen Energy 2025年 144卷 977-991页

作者： Siahaan, Gabriele Maruli Tondi Jiang, Shan Tanahashi, Mamoru Juangsa, Firman Bagja Mechanical Engineering Undergraduate Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Thermal Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Department of Mechanical Engineering Institute of Science Tokyo 2-12-1 Ookayama Meguro-ku Tokyo152-8550 Japan

Over the past 150 years, carbon dioxide levels in the atmosphere have risen significantly, causing a rise in temperatures due to disruptions in the natural carbon cycle. One proposed solution is transitioning to non-carbon fuels like hydrogen, which requires modifications to current gas turbine systems despite its higher flame temperature and flammability than carbon-based fuels. A suggested modification involves a non-premixed multi-cluster jet configuration with steam dilution to achieve a lifted flame. Steam dilution is utilized to lower the combustion temperature due to material limitations and to achieve a high systematical efficiency, which can be achieved through the Graz Cycle system. This study employs large eddy simulation (LES) to analyze oxy-hydrogen combustion with steam dilution, focusing on flow dynamics, flame structure, and combustion behavior. The study also examines the impact of oxidizer jet angles and fuel jet velocities. Three simulations with different oxidizer jet angles and four variations of fuel jet velocity reveal that narrower oxidizer jet angles produce richer combustion regions. Larger oxidizer jet angles yield less turbulent flow but a more stable flame. In contrast, higher fuel jet velocities intensify turbulence, resulting in a more stable flame. This can occur since the combustion shifts towards stoichiometric and rich combustion region as fuel jet velocity increases. A more pronounced recirculation flow and enhanced mixing process also allow the flame to hold on to the flame anchor, which helps reach a more stable flame. The maximum heat release rates within the simulation domain are approximately 270 W and 250 W for angle and fuel jet velocity cases, respectively. © 2025 Hydrogen Energy Publications LLC

关键词： Steam

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Phase separation-hydrogen etching-derived Cu-decorated Cu-Mn bimetallic oxides with oxygen vacancies boosting superior sodium-ion storage kinetics

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Journal of Energy Chemistry 2023年第5期80卷 163-173,I0005页

作者： Lin Yan Lingshuo Zong Qi Sun Junpeng Guo Zhenyang Yu Zhijun Qiao Jiuhui Han Zhenyu Cui Jianli Kang School of Material Science and Engineering Tiangong UniversityTianjin 300387China School of Mechanical Engineering Tiangong UniversityTianjin 300387China Institute for New Energy Materials and Low-Carbon Technologies Tianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China

Understanding the crystal phase evolution of bimetallic oxide anodes is the main concern to profoundly reveal the conversion reaction kinetics and sodium-ion storage ***,an integrated selfsupporting anode of the Cu-decorated Cu-Mn bimetallic oxides with oxygen vacancies(Ov-BMO-Cu)are in-situ generated by phase separation and hydrogen etching using nanoporous Cu-Mn alloy as selfsacrificial *** this basis,we have elucidated the relationship between the phase evolution,oxygen vacancies and sodium-ion storage mechanisms,further demonstrating the evolution of oxygen vacancies and the inhibition effect of manganese oxides as an“anchor”on grain aggregation of copper *** kinetic analyses confirm that the expanded lattice space and increased oxygen vacancies of cycled Ov-BMO-Cu synergistically guarantee effective sodium-ion diffusion and storage ***,the Ov-BMO-Cu electrode exhibits higher reversible capacities of 4.04 mA h cm^(-2)at 0.2 mA cm^(-2)after 100 cycles and 2.20 m A h cm^(-2)at 1.0 mA cm^(-2)after 500 ***,the presodiated Ov-BMO-Cu anode delivers a considerable reversible capacity of 0.79 m A h cm^(-2)at 1.0 mA cm^(-2)after 60 cycles in full cells with Na_(3)V_(2)(PO_(4))_(3)cathode,confirming its outstanding ***,this work is expected to provide enlightenment for designing high-capacity bimetallic oxide anodes.

关键词： Sodium-ion storage mechanism Bimetallic oxide anode material Crystal phase evolution Oxygen vacancies Kinetic analyses

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Effect of tungsten carbide particles on microstructure and mechanical properties of Cu alloy composite bit matrix

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Journal of Iron and Steel Research International 2024年第2期31卷 519-530页

作者： Ding-qian Dong Feng-yuan He Xin-hui Chen Hui Li Kai-hua Shi Hui-wen Xiong Xin Xiang Li Zhang College of Mechanical Engineering Sichuan University of Science and EngineeringZigong643000SichuanChina State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083HunanChina Zigong Cemented Carbide Co. Ltd.Zigong643011SichuanChina Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and EngineeringZigong643000SichuanChina

Copper alloy composite bit matrix was prepared by pressureless vacuum infiltration,using at least one of the three kinds of tungsten carbide particles,for example,irregular cast tungsten carbide,monocrystalline tungsten carbide and sintered reduced tungsten carbide *** effects of powder particle morphology,particle size and mass fraction of tungsten carbide on the microstructure and mechanical properties of copper alloy composite were investigated by means of scanning electron microscopy,X-ray diffraction and abrasive wear test in *** results show that tungsten carbide morphology and particle size have obvious effects on the mechanical properties of copper alloy *** tungsten carbide partially dissolved in the copper alloy binding phase,and layers of Cu_(0.3)W_(0.5)Ni_(0.1)Mn_(0.1)C phase with a thickness of around 8–15μm were formed on the edge of the cast tungsten *** 45%irregular crushed fine cast tungsten carbide and 15%monocrystalline cast tungsten carbide were used as the skeleton,satisfactory comprehensive performance of the reinforced copper alloy composite bit matrix was obtained,with the bending strength,impact toughness and hardness reaching 1048 MPa,4.95 J/cm^(2) and 43.6 HRC,*** main wear mechanism was that the tungsten carbide particles firstly protruded from the friction surface after the copper alloy matrix was worn,and then peeled off from the matrix when further wear occurred.

关键词： Polycrystalline diamond compact Pressureless vacuum infiltration Copper alloy composite bit matrix Microstructure characterization Abrasive wear behavior

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Distance Learning at the MS and PhD Levels in the Nuclear and Radiation engineering program, Nuclear and Applied Robotics, materials science and engineering and Walker Department of mechanical engineering at the University of Texas at Austin

Distance Learning at the MS and PhD Levels in the Nuclear an...

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2023 Transactions of the American Nuclear Society Winter Conference and Expo, ANS 2023

作者： Landsberger1, Sheldon Charlton, William Clamo, Kevin Ezekoye, Ofodike Kovar, Desiderio Haas, Derek Pryor, Mitchell University of Texas at Austin Nuclear and Radiation Engineering Program Nuclear Engineering Teaching Lab 10100 Burnet Road Pickle Research Campus R-9000 AustinTX United States Walker Department of Mechanical Engineering University of Texas at Austin 204.Dean Keeton ETC II 5.160 AustinTX United States The University of Texas at Austin Materials Science and Engineering Walker Department of Mechanical Engineering 204 Dean Keeton ETC II 5.100 AustinTX United States

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