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Effect of Squealer Tip with Deep Scale Depth on the Aero-thermodynamic Characteristics of Tip Leakage Flow

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Journal of Thermal Science 2022年第5期31卷 1773-1789页

作者： bi shuai WANG Longfei WANG Feilong WANG Lei LI Ziqiang Jiangsu Province Key Laboratory of Aerospace Power System Nanjing University of Aeronautics and AstronauticsNanjing210016China

In this paper,the aero-thermal performance of squealer tips with deep-scale depth is numerically investigated in an axial flow turbine,which is compared with the squealer tip with traditional cavity *** methods were validated with experimental *** effect of cavity depth and tip clearance was *** numerical results show that for the squealer tip with conventional cavity depth,the size of the reflux vortex enlarges as the cavity depth *** velocity and uniformity of high entropy production rate(EPR)inside the cavity reduce obviously with the cavity developing into ***,the increase of depth 10%of the blade span(H)leads to enlargement of cavity volume,which increases the total entropy production *** the overall dimensionless entropy production rate(DEPR)of gap and cavity obtains a maximum increase of 43.54%in contrast to the case with 1%H depth *** a result,the relative leakage mass flow rate reduces by 20.6%as the cavity depth increases from 1%to 10%.Given the heat transfer,as the cavity significantly increases to 10%H,the enhanced cavity volume results in a more enormous cavity vortex with low velocity covering the floor,which weakens the convective heat transfer intensity and reduces the area of high heat *** normalized average heat transfer coefficient at the cavity bottom reduces by 40.26%compared to the cavity depth of 1%*** addition,the deep-scale cavity is more effective in inhibiting leakage flow at smaller tip *** reduction amplitude of normalized average heat transfer coefficient at the squealer floor decreases as tip clearance increases,which reduces at most by about 72.6%for the tip clearance of 1%H.

关键词： squealer tip turbine aerothermodynamics tip leakage flow deep-scale depth heat transfer numerical methods

Experimental Study on Impingement and Film Overall Cooling Characteristics of Turbine Shroud

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Journal of Thermal Science 2022年第1期31卷 239-250页

作者： LI Ziqiang WANG Longfei MAO Junkui bi shuai WANG Feilong College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Based on the variable characteristics of the actual operating conditions of the turbine shroud and the purpose of improving the cooling effect of the turbine shroud,this paper builds a test system of the impingement-film cooling shroud with two gas inlet angles(90°,167°).The effects of film cooling hole arrangement,gas inlet angle,blowing ratio(0.7,1.0,1.5,2.0,2.5,3.0)and temperature ratio(1.2,1.3,1.4,1.5,1.6)on the cooling characteristics of the impingement-film cooling shroud were experimentally studied by infrared temperature measurement technology,especially the effects of gas inlet angle and temperature *** results showed that the film covering effect of the film cooling hole vertical or the same direction of the high-temperature gas incoming flow is better than the film covering effect of the reverse direction with the incoming flow,and the optimal arrangement of film cooling holes can improve the cooling effectiveness of the *** with 90°intake gas,the film coverage area on the shroud surface of the 167°intake gas is expanded,and the surface average overall cooling effectiveness is increased by 1.03%to 12.6%.The overall cooling effectiveness of turbine shroud increases with the increase of blowing ratio,which increases the flow rate and pressure of cooling gas,and the corresponding increase rate is between 1.04%and 9.96%.However,the increase in the temperature ratio increases the mainstream heating capacity,resulting in a decrease in the cooling effectiveness of the shroud,with a maximum reduction rate of 11.04%.

关键词： turbine shroud overall cooling effectiveness impingement-film cooling blowing ratio temperature ratio

Two-dimensional polymer-based nanosheets for electrochemical energy storage and conversion

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Journal of Energy Chemistry 2018年第1期27卷 99-116页

作者： shuai bi Chenbao Lu Wenbei Zhang Feng Qiu Fan Zhang School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China

Over the past decades, two-dimensional（2D） nanomaterials possessing planar layered architecture and unique electronic structures have been being quickly developed, due to their wide potential application in the fields of chemistry, physics, and materials science. As a new family of 2D nanomaterials, 2D polymerbased nanosheets, featuring excellent characters, such as tunable framework structures, light weight, flexibility, high specific surface, and good semiconducting properties, have been emerging as one kind of promising functional materials for optoelectronics, gas separation, catalysis and sensing, etc. In this review, the recent progress in synthetic approach and characterization of 2D polymer-based nanosheets were summarized, and their current advances in electrochemical energy storage and conversion including second batteries, supercapacitors, oxygen reduction and hydrogen evolution were discussed systematically.

关键词： Two-dimensional polymer Nanosheet Nanoscale morphology Electrochemical performance Energy storage and conversion

Covalent Organic Frameworks with trans-Dimensionally Vinylene-linked π-Conjugated Motifs

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Chemical Research in Chinese Universities 2022年第2期38卷 382-395页

作者： bi shuai MENG Fancheng ZHANG Zixing WU Dongqing ZHANG Fan School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240P.R.China

Vinylene-linked covalent organic frameworks(COFs) are a class of promising porous organic materials that feature fully π-conjugated structures, high crystallinity, permanent porosity, ultrahigh chemical stability, and extraordinary optoelectronic properties. Over the past 5 years, this kind of material has been witnessed rapid development either in chemical synthesis or in potential applications. In this review, we summarize the chemistry to synthesize vinylene-linked COFs, especially the synthetic strategies involving activation of aryl methyl groups for condensation reaction. We then scrutinize the state-of-the-art development in properties and functions of this kind of COFs. Our own opinions on the further development of the vinylene-linked COFs are also presented for discussion.

关键词： Covalent organic framework(COF) Vinylene linkage Stability π-Conjugated structure Semiconducting property

Studies on Hemolysis of Hemolysin Produced by Synechocystis sp. PCC 6803

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Journal of Ocean University of China 2011年第4期10卷 362-368页

作者： bi shuai WANG Wei ZHAO Yuanyuan RU Shaoguo LIU Yunzhang College of Marine Life Sciences Ocean University of ChinaQingdao 266003P.R.China

Hemolysin produced by various bacteria,may destroy erythrocyte membranes via a pore-forming mechanism,a deter-gent action,or a lipase *** to this experiment,the mode of action used by cyanobacterial hemolysin had not been *** characterize the action mode of hemolysin produced by the wild-type strain of Synechocystis ***6803,hemolysis of erythrocytes originating from human,mouse,sheep,rabbit and goldfish was *** erythrocytes of mouse,sheep and rabbit were sensitive,while those of human and fish were resistant,to this *** rabbit erythrocytes,it was shown that hemoly-sis occurred in two steps:a binding step within the first 10 min of treatment and a lytic step after 30 *** binding and lysis were highly *** of erythrocyte density on hemolysis suggest that the hemolysin might target erythrocytes via a multiple-hit *** the osmotic protection experiment,all tested osmotic protectants,with molecular diameters ranging from 0.9 ?5.66 nm,failed to effectively inhibit *** electron micrographs showed that the hemolysin caused protuberances or echinocytes in rabbit erythrocytes,and then disrupted and ruptured the *** of hemolysis showed distinct differences from other pore-forming mechanisms,suggesting that this hemolysin might act through a detergent-like or lipase mecha-nism,rather than a pore-forming mechanism.

关键词： cyanobacterium Synechocystis sp.PCC 6803 hemolysin erythrocyte hemolysis

Systemic acquired resistance, NPR1, and pathogenesis-related genes in wheat and barley

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Journal of Integrative Agriculture 2018年第11期17卷 2468-2477页

作者： WANG Xiao-dong bi Wei-shuai GAO Jing YU Xiu-mei WANG Hai-yan LIU Da-qun College of Plant Protection/biological Control Center for Plant Diseases and Plant Pests of Hebei Hebei Agricultural University Baoding 071000 P.R.China College of Life Sciences Hebei Agricultural University Baoding 071000 P.R.China Graduate School of Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

In Arabidopsis, systemic acquired resistance （SAR） is established beyond the initial infection by a pathogen or is directly induced by treatment with salicylic acid （SA） or its functional analogs, 2,6-dichloroisonicotinic acid （INA） and benzothiadiazole （BTH）. NPR1 protein is considered the master regulator of SAR in both SA signal sensing and transduction. In wheat （Triticum aesfivum） and barley （Hordeum vulgare）, both pathogen infection and BTH treatment can induce broad-spectrum resistance to various diseases, including powdery mildew, leaf rust, Fusarium head blight, etc. However, three different types of SAR-like responses including acquired resistance （AR）, systemic immunity （SI）, and BTH-induced resistance （biR） seem to be achieved by activating different gene pathways. Recent research on wheat and barley NPR1 homologs in AR and SI has provided the initial clue for understanding the mechanism of SAR in these two plant species. In this review, the specific features ofAR, Si, and biR in wheat and barley were summarized and compared with that of SAR in model plants of Arabidopsis and rice. Research updates on downstream genes of SAR, including pathogenesis-related （PR） and BTH-induced genes, were highlighted.

关键词： systemic acquired resistance NPR1 pathogenesis-related genes wheat barley

Nano-selenium alleviates cadmium-induced cerebellar injury by activating metal regulatory transcription factor 1 mediated metal response

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Animal Nutrition 2022年第4期11卷 402-412页

作者： Shao-shuai bi Milton Talukder Hai-Tao Jin Mei-Wei Lv Jing Ge Cong Zhang Jin-Long Li College of Veterinary Medicine Northeast Agricultural UniversityHarbin 150030China College of biotechnology and Pharmaceutical Engineering of West Anhui University Lu’an 237012China Department of Physiology and Pharmacology Faculty of Animal Science and Veterinary MedicinePatuakhali Science and Technology UniversityBarishal8210Bangladesh Quality and Safety Institute of Agricultural Products Heilongjiang Academy of Agricultural SciencesHarbin 150010China College of Veterinary Medicine Henan Agricultural UniversityZhengzhou 450002China Key Laboratory of the Provincial Education Department of Heilongjiang for Common Animal Disease Prevention and Treatment Northeast Agricultural UniversityHarbin 150030China Heilongjiang Key Laboratory for Laboratory Animals and Comparative Medicine Northeast Agricultural UniversityHarbin 150030China

This study aims to investigate the role of metal regulatory transcription factor 1(MTF1)-mediated metal response in cadmium(Cd)-induced cerebellar injury,and to evaluate the antagonistic effects of nanoselenium(Nano-Se)against Cd toxicity.A total of 80 chicks(1 d old,male,Hy-Line Variety White)were randomly allocated to 4 treatment groups for 3 months:the control group(fed with a basic diet,n=20),the Nano-Se group(basic diet with 1 mg/kg nano-Se 1 mg/kg Nano-Se in basic diet,n=20),the NanoSe+Cd group(basic diet with 1 mg/kg Nano-Se and 140 mg/kg Cd Cl_(2),n=20)and the Cd group(basic diet with 140 mg/kg Cd Cl_(2),n=20).The results of the experiment showed that the Purkinje cells were significantly decreased with their degradation and indistinct nucleoli after Cd ***,exposure to Cd caused a significant accumulation of Cd and ***,the contents of Se,iron,and zinc were decreased,thereby disturbing the metal homeostasis in the *** Cd exposure also resulted in high levels of malondialdehyde(MDA)and down regulation of selenoprotein ***,the expressions of MTF1,metallothionein 1(MT1),MT2,zinc transporter 3(ZNT3),ZNT5,ZNT10,zrt,irt-like protein 8(ZIP8),ZIP10,transferrin(TF),ferroportin 1(FPN1),ATPase copper transporting beta(ATP7B),and copper uptake protein 1(CTR1)were inhibited by Cd ***,all these changes were significantly alleviated by the supplementation of *** study proved that Cd could disorder metal homeostasis and induce oxidative stress,whereas Nano-Se could relieve all these negative effects caused by Cd via activating the MTF1-mediated metal response in the cerebellum of chicken.

关键词： Nano-selenium Cadmium Selenoprotein transcriptome MTF1-mediated metal response Cerebellar injury

S-enriched porous polymer derived N-doped porous carbons for electrochemical energy storage and conversion

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 346-357页

作者： Chao Zhang Chenbao Lu shuai bi Yang Hou Fan Zhang Ming Cai Yafei He Silvia Paasch Xinliang Feng Eike Brunner Xiaodong Zhuang State Key Laboratory of Metal Matrix Composites & Shanghai Key Lab of Electrical Insulation and Thermal Ageing School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China Key Laboratory of biomass Chemical Engineering of Ministry of Education College 0f Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China Center for Advancing Electronics Dresden (cfaed) Technische Universitat Dresden 01062 Dresden. Germany Chair for Molecular Functional Materials Department of Chemistry and Food Chemistry School of Science Technische Universit~t Dresden Mommensenstr. 4 01069 Dresden Germany

Porous polymers have been recently recog- nized as one of the most important precursors for fabrication of heteroatom-doped porous carbons due to the intrinsic porous structure, easy available heteroatom- containing monomers and versatile polymerization meth- ods. However, the heteroatom elements in as-produced porous carbons are quite relied on monomers. So far, the manipulating of heteroatom in porous polymer derived porous carbons are still very rare and challenge. In this work, a sulfur-enriched porous polymer, which was prepared from a diacetylene-linked porous polymer, was used as precursor to prepare S-doped and/or N-doped porous carbons under nitrogen and/or ammonia atmo- spheres. Remarkably, S content can sharply decrease from 36.3% to 0.05% after ammonia treatment. The N content and specific surface area of as-fabricated porous carbons can reach up to 1.32% and 1508 m^2·g^-1, respectively. As the electrode materials for electrical double-layer capacitors, as-fabricated porous carbons exhibit high specific capacitance of up to 431.6 F·g^-1 at 5 mW·s^-1 and excellent cycling stability of 99.74% capacitance retention after 3000 cycles at 100 mV·s^-1. Furthermore, as the electro- chemical catalysts for oxygen reduction reaction, as- fabricated porous carbons presented ultralow half-wave- potential of 0.78 V versus RHE. This work not only offers a new strategy for manipulating S and N doping features for the porous carbons derived from S-containing porous polymers, but also paves the way for the structure- performance interrelationship study of heteroatoms co- doped porous carbon for energy applications.

关键词： porous polymers porous carbons sulfur and nitrogen doping supercapacitor

Tailorable Multi-Photoresponsive Behavior Triggered by Different Sulfur Oxidation States

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CCS Chemistry 2024年第10期6卷 2465-2475页

作者： Jingjing Guo Xiaoluo Peng Shihuai Wang shuai bi Ting He Yu Cheng Zujin Zhao Ben Zhong Tang Yanli Zhao School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological UniversitySingapore 637371 State Key Laboratory of Luminescent Materials and Devices Key Laboratory of Luminescence from Molecular Aggregates of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510640 School of Science and Engineering The Chinese University of Hong KongShenzhenGuangdong 518172

Photoresponsive materials are considered as promising systems for intelligent technology applications owing to the contactless spatial and temporal ***,controllable multi-photoresponsive behaviors are realized in benzo[b]thiophene derivatives(o-DMP-S,o-DMP-SO,and o-DMP-SO_(2))by modulating the sulfur oxidation *** them,o-DMP-S is photo-unreactive but possesses denser molecular packing upon ultraviolet(UV)light irradiation,exhibiting photoenhanced room-temperature phosphorescence *** stoichiometric oxidation of the sulfur atom in o-DMP-S,the resulting sulfoxide compound o-DMP-SO undergoes a radical photolysis reaction involving photodeoxygenation and photochemical rearrangement,thereby leading to the photomechanical *** sulfone compound o-DMP-SO_(2)displays prominent reversible photochromism,resulting from the radical photocyclization under 365 nm UV light *** on comprehensive experimental and computational investigations,the diverse photoresponsive behaviors of these benzo[b]thiophene derivatives are demonstrated to depend on the intersystem crossing efficiency and radical-mediated photochemical reaction activity in excited states due to the different sulfur oxidation *** work provides an insightful understanding of the relationship between molecular structure and photoresponsive behavior and opens up the opportunity for the development of photoresponsive materials with potential applications.

关键词： photoenhanced room-temperature phosphorescence photomechanical effect radicalmediated photochemical reaction reversible photochromism sulfur oxidation state