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Dual stability enhancement mechanisms of axial-slot casing treatment in a high-speed mixed-flow compressor with various tip clearances

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Chinese Journal of Aeronautics 2021年第4期34卷 19-31页

作者： Qianfeng ZHANG Juan DU Jichao LI Ming ZHAO Hongwu ZHANG Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300072China

The influence of Axial-Slot Casing Treatment(ASCT)on the performance and stability enhancement mechanisms of ASCT were experimentally and numerically investigated in a highspeed mixed-flow compressor under three different tip *** simulations showed the compressor stalled through end-wall stall route,*** spike stall inception originating from rotor tip region,which was validated by dynamical *** the ASCT was applied,greater than 20%of Stall Margin Improvement(SMI)could be achieved for the compressor under each tip clearance *** streamwise velocity contours and flow structures in the tip region and axial slots were deeply analyzed to explore how the so called‘‘suction and injection effects"generated by the ASCT manipulate tip clearance flow and enhance the stability of compressor under different tip *** was found that the dominant stability enhancement mechanisms of ASCT varies with tip clearance size for the mixed-flow compressor.(A)For the small tip clearance,the dominant mechanism of stability enhancement is the blockage reduction generated in the blade passage by the suction effect of ASCT.(B)For the large tip clearance,the injection effect of the ASCT is the dominant mechanism of stability enhancement with ASCT,which plays the leading role in delaying the spillage of incoming/tip leakage flow interface at the rotor Leading Edge(LE)plane.

关键词： Aerodynamic stability Casing treatment Compressor Numerical simulation stability enhancement

Unravelling the nature of the active species as well as the Mn doping effect over gamma-Al_(2)O_(3) catalyst for eliminating AsH_(3) and PH_(3)

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Journal of Environmental Sciences 2024年第2期136卷 213-225页

作者： Bowen Xu Jiaxin Qu Xueqian Wang Langlang Wang Yu Pu Ping Ning Yibing Xie Yixing Ma Qiang Ma Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China

To investigate the enhancing effect of Mn on the performance of simultaneous catalytic oxidation of AsH_(3)and PH_(3)by CuO-Al_(2)O_(3)in a reducing atmosphere under micro-oxygen conditions,Cu-Mn modifiedγ-Al_(2)O_(3)catalysts were *** characteristics of the catalysts showed that Mn reduced the crystallinity of the active CuO component,increased the number of oxygen vacancies and acidic sites on the catalyst surface,enhanced the mobility of surface oxygen,and the interaction between copper and manganese promoted the redox cycling ability of the catalysts and improved their oxidation performance,which increased the conversion frequency(TOF)by 2.54×10^(-2)to 3.07×10^(-2)sec^(-1).On the other hand,the introduction of Mn reduced the production of phosphate and As_(2)O_(3)on the catalyst surface by30.96%and 44.9%,which reduced the coverage and inerting of the active sites by phosphate and As_(2)O_(3),resulting in an 8 hr(6 hr)improvement in the stability of PH_(3)(AsH_(3))removal.

关键词： AsH_(3)-PH_(3)removal Oxygen activation Mn doping stability enhancement

Lead halide perovskite nanowires stabilized by block copolymers for Langmuir-Blodgett assembly

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Nano Research 2020年第5期13卷 1453-1458页

作者： Hao Liu Martin Siron Mengyu Gao Dylan Lu Yehonadav Bekenstein Dandan Zhang Letian Dou A.Paul Alivisatos Peidong Yang Department of Chemistry University of CaliforniaBerkeleyCalifornia 94720USA Department of Materials Science and Engineering University of CaliforniaBerkeleyCalifornia 94720USA Materials Science Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Kavli Energy NanoScience Institute BerkeleyCalifornia 94720USA Center for Advanced Low-dimension Materials Donghua UniversityShanghai 201620China Department of Materials Science and Engineering Technion-Israel institute of technologyHaifa 3200003Israe Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIndiana 47907USA

The rapid development of solar cells based on lead halide perovskites(LHPs)has prompted very active research activities in other closely-related *** nanostructures of such materials display superior optoelectronic ***,onedimensional(1D)LHPs nanowires show anisotropic optical properties when they are highly ***,the ionic nature makes them very sensitive to external environment,limiting their large scale practical ***,we introduce an amphiphilic block copolymer,polystyrene-block-poly(4-vinylpyridine)(PS-P4VP),to chemically modify the surface of colloidal CsPbBr3 *** resulting core-shell nanowires show enhanced photoluminescent emission and good colloidal stability against *** advantage of the stability enhancement,we further applied a modified Langmuir-Blodgett technique to assemble monolayers of highly aligned nanowires,and studied their anisotropic optical properties.

关键词： nanowires anisotropic optical properties aligned monolayer lead halide perovskites stability enhancement

Anionic formulation of electrolyte additive towards stable electrocatalytic oxygen evolution in seawater splitting

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Journal of Energy Chemistry 2022年第9期31卷 361-369,I0010页

作者： Meng Yu Jinhan Li Fangming Liu Jiuding Liu Wence Xu Honglu Hu Xijie Chen Weichao Wang Fangyi Cheng Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Engineering Research Center on High-Efficiency Energy Storage(Ministry of Education)Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China Integrated Circuits and Smart System Lab.(Shenzhen) Renewable Energy Conversion and Storage CenterTianjin Key Laboratory of Photo-Electronic Thin Film Device and TechnologyCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin 300071China

Hydrogen generation through seawater electrolysis provides a promising,attractive pathway towards the utilization of sustainable ***,the catalytic activity and stability of oxygen evolution anode are severely limited by the chloride-induced corrosion and competitive oxidation *** this work,we demonstrate an anion-assisted performance improvement strategy by quick and universal screening of electrolyte additive via correlating Cl-repellency with the anionic ***,the addition of phosphate ions is found to enable highly stable alkaline seawater splitting at industry-level current density(0.5 A cm^(-2))over 500 h using transition metal hydroxides as anodic *** situ experiments and theoretical simulations further reveal that the dynamic anti-corrosion behaviors of surface-adsorbed phosphate ions are attributed to three factors including repelling Cl-ions without significantly blocking OH-diffusion,preventing transition metal dissolution and acting as a local pH buffer to compensate the fast OH-consumption under high current electrolysis.

关键词： Alkaline seawater splitting Oxygen evolution reaction stability enhancement Chloride corrosion Phosphate

General Nondestructive Passivation by 4-Fluoroaniline for Perovskite Solar Cells with Improved Performance and stability

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General Nondestructive Passivation by 4-Fluoroaniline for Pe...