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Influences of Inflow Condition on Non-Axisymmetric Flows in Turbine Exhaust Hoods

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Journal of Thermal Science 2008年第4期17卷 305-313页

作者： jing-Lun fu Jian-Jun LIU Institute of Engineering ThermophysicsChinese Academy of Sciences Beijing 100190 China

The complex 3D flow in a steam turbine exhaust hood model with different inlet swirl and inlet total pressure radial distributions has been simulated by employing CFX-5 and analyzed in this paper. It＇s found that the inlet tangential flow angle at hub has a negative effect on the exhaust hood performance, while a negative gradient of inlet total pressure radial distribution has a positive impact on the hood performances. It＇s also numerically con- firmed that a proper distribution of total pressure at hood inlet can successfully eliminate the negative effects caused by the inappropriate inlet swirl distribution and improve the hood aerodynamic performance.

关键词： turbine exhaust hood inflow conditions non-axisymmetric flow

Investigations on the Improving Aerodynamic Performances of Last Stage Steam Turbine and Exhaust Hood under Design and Off Design Conditions

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Journal of Thermal Science 2015年第5期24卷 468-477页

作者： fu jing-Lun LIU Jian-Jun Key Laboratory of Advanced Energy and Power Institute of Engineering Thermophysics

The purpose of this paper is to improve the aerodynamic performances of the last stage turbine and the exhaust hood of a 600MW steam turbine under design and off design conditions. During operation, strong flow interactions between the turbine and the exhaust hood impose influences on the flow behavior in the hood and lead to the unsatisfactory aerodynamic performance of the turbine and exhaust hood. So the exhaust hood has the potential to be improved in terms of aerodynamic efficiency. Considering the flow interactions between the turbine and the exhaust hood, the profiles of the diffuser end-wall were optimized. The coupled model turbine and model exhaust hood calculations and experiments were carried out to validate the effects of the optimization. Model experiments show that the design modifications resulted in a substantial increase in the overall pressure recovery coefficient. The flow and aerodynamic performances of the full-scale last stage turbine and full-scale exhaust hood were simulated to explore the flow physics alterations to the modification of diffuser geometry. The wet steam was selected as the flow medium. The actual flow fields trader different operation conditions were analyzed.

关键词： steam turbine exhaust hood full scale coupling flow

Stripping of uranium from an ionic liquid medium by TOPO-modified supercritical carbon dioxide

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Science China Chemistry 2015年第3期58卷 545-550页

作者： jing fu Qingde Chen Xinghai Shen Beijing National Laboratory for Molecular Sciences (BNLMS) Fundamental Science on Radiochemistry and Radiation Chemistry LaboratoryCollege of Chemistry and Molecular Engineering Peking University

UO2＋, which is extracted from the aqueous phase into the 1-ethyl-3-methylimidazolium bis（trifluoromethylsulfonyl）imide（C2mim NTf2） ionic liquid ph^ase with octyl（phenyl）-N,N-diisobutylcarbamoylmethylphosphine oxide（CMPO）, can be stripped by supercritical CO2. Trioctylphosphine oxide（TOPO）, the modifier added to the supercritical CO2 phase, enhances the stripping efficiency by up to 99%.

关键词： UO2^2+ supercritical CO2 stripping CMPO ionic liquids

Stationary Patterns of a Ratio-dependent Prey-predator Model with Cross-diffusion

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Acta Mathematicae Applicatae Sinica 2017年第2期33卷 497-504页

作者： jing-fu ZHAO Hong-tao ZHANG jing YANG School of Science Zhongyuan University of Technology Zhengzhou 450007 China

This paper is concerned with a ratio-dependent predator-prey system with diffusion and cross- diffusion in a bounded domain with no flux boundary condition. We show that under certain hypotheses, the cross-diffusion c... 详细信息

关键词： existence predator-prey system cross-diffusion positive steady state ratio-dependence topolog-ical degree

Simple Fabrication of Hierarchical Micro/Nanostructure Superhydrophobic Surface with Stable and Superior Anticorrosion Silicon Steel via Laser Marking Treatment

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Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 411-417页

作者： fu jing TANG Mingkai ZHANG Qiaoxin School of Mechanical and Electronic Engineering Henan Institute of TechnologyXinxiang 453003China School of Mechanical and Electronic Engineering Wuhan University of TechnologyWuhan 430070China

To improve the weak corrosion resistance of silicon steel to acid solution and alkaline solution with high temperature,a stable hierarchical micro/nanostructure superhydrophobic surface with myriad irregular micro-scale hump and sheet-like nanostructure was successfully prepared on silicon steel by a simple,efficient and facile operation in large-area laser marking *** morphology,composition,wettability of the as-prepared surface were *** superhydrophobic performance of the surface was investigated as ***,the corrosion resistance of the superhydrophobic surface to acidic solutions at room temperature and alkaline solutions at high temperature (80 ℃) was carefully *** corrosion resistance mechanism was ***,considering the practical application of the surface in the future,the hardness of the hierarchical micro/nanostructure superhydrophobic surface was *** experimental results indicate that the hierarchical micro/nanostructure surface with texture spacing of 100 μm treated at laser scanning speed of 100 mms/ presents superior superhydrophobicity after decreasing surface *** contact angle can be as high as 156.6°.Additionally,the superhydrophobic surface provide superior and stable anticorrosive protection for silicon steel in various corrosive *** importantly,the prepared structure of the surface shows high hardness,which ensures that the surface of the superhydrophobic surface cannot be destroyed *** surface is able to maintain great superhydrophobic performance when it suffers from slight impacting and abrasion.

关键词： silicon steel laser marking hierarchical micro/nanostructure superhydrophobic surface corrosion resistance

Comparison of Catalytical and Biological Activities for Substituted Polyoxotungstates Containing Ti and CpTi

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Chemical Research in Chinese Universities 2003年第1期19卷 20-23页

作者： LIU jing-fu WANG Xiao-hong 等 InstituteofPolyoxometalateChemistry FacultyofChemistryNortheastNormalUniversityChangchun130024P.R.China InstituteofPolyoxometalateChemistry FacultyofChemistryNortheastNormalUnivers

The effect of the functionallization of POMs on their properties was examined by the comparison between both titanium and its corresponding cyclopentadienyl subsituted polyoxocomplexes. The polarographic half wave potential of the complexes indicated that the effect of the functionallization of POMs increased the oxidizing ability of the polyoxoanions. The inhibitory effects of the CpTi polyoxocomplexes on tumor cells are higher than those of the corresponding titanium polyoxocomplexes, and the toxicity of the former is lower than that of the latter. The oxygenation reactions of cyclohexene, styrene, trans stilbene and maleic acid with PhIO or hydrogen peroxide(30% aqueous solution) catalyzed respectively by Ti and CpTi polyoxocomplexes were compared.

关键词： Polyoxometalate Titanium substituted polyoxotungstate 183 W NMR Antitumor activity

Synthesis,Characterization　and　Catalytic　Activity　of　Polyoxometalates　Derived　from　α-P₂W₁₅O₅6⁽12

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Chemical Research in Chinese Universities 1998年第1期14卷 1-5页

作者： Meng, Lu Liu, jing-fu NE Normal Univ Dept Chem Changchun 130024 Peoples R China

Ｓｙｎｔｈｅｓｉｓ，ＣｈａｒａｃｔｅｒｉｚａｔｉｏｎａｎｄＣａｔａｌｙｔｉｃＡｃｔｉｖｉｔｙｏｆＰｏｌｙｏｘｏｍｅｔａｌａｔｅｓＤｅｒｉｖｅｄｆｒｏｍα－Ｐ;Ｗ;Ｏ;６;ＬｉｇａｎｄＭＥＮＧＬｕ，ａｎｄＬＩＵＪｉｎｇ－ｆ... 详细信息

Ｓｙｎｔｈｅｓｉｓ，ＣｈａｒａｃｔｅｒｉｚａｔｉｏｎａｎｄＣａｔａｌｙｔｉｃＡｃｔｉｖｉｔｙｏｆＰｏｌｙｏｘｏｍｅｔａｌａｔｅｓＤｅｒｉｖｅｄｆｒｏｍα－Ｐ;Ｗ;Ｏ;６;ＬｉｇａｎｄＭＥＮＧＬｕ，ａｎｄＬＩＵＪｉｎｇ－ｆｕ(Ｄｅｐａ...

关键词： Activity Polyoxometalates Catalytic

Efficient acetoin production from pyruvate by engineered Halomonas bluephagenesis whole-cell biocatalysis

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Frontiers of Chemical Science and Engineering 2023年第4期17卷 425-436页

作者： Meiyu Zheng Zhenzhen Cui jing Zhang jing fu Zhiwen Wang Tao Chen Department of Biochemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Frontier Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China Department of Biology and Biological Engineering Chalmers University of TechnologyGothenburg 41296Sweden

Acetoin is an important platform chemical,which has a wide range of applications in many *** bluephagenesis,a chassis for next generation of industrial biotechnology,has advantages of fast growth and high tolerance to organic acid salts and alkaline ***,α-acetolactate synthase andα-acetolactate decarboxylase from Bacillus subtilis 168 were co-expressed in *** to produce acetoin from *** reaction condition optimization and further increase ofα-acetolactate decarboxylase expression,acetoin production and yield were significantly enhanced to 223.4 mmol·L^(-1) and 0.491 mol·mol^(-1) from 125.4 mmol·L^(-1) and 0.333 mol·mol^(-1),***,the highest titer of 974.3 mmol·L^(-1)(85.84 g·L^(-1))of acetoin was accumulated from 2143.4 mmol·L^(-1)(188.6 g·L^(-1))of pyruvic acid within 8 h in fed-batch bioconversion under optimal reaction ***,the reusability of the cell catalysis was also tested,and the result illustrated that the whole-cell catalysis obtained 433.3,440.2,379.0,442.8 and 339.4 mmol·L^(-1)(38.2,38.8,33.4,39.0 and 29.9 g·L^(-1))acetoin in five repeated cycles under the same *** work therefore provided an efficient *** whole-cell catalysis with a broad development prospect in biosynthesis of acetoin.

关键词： acetoin pyruvate α-acetolactate synthetase α-acetolactate decarboxylase Halomonas bluephagenesis whole-cell biocatalysis

INFLUENCE OF STRUCTURE ON HYDRAULIC CHARACTERISTICS OF T SHAPE FISHWAY

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Journal of Hydrodynamics 2012年第5期24卷 684-691页

作者： MAO Xi fu jing-jing TUO You-cai AN Rui-dong LI Jia State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University Chengdu 610065China HydroChina Hua Dong Engineering Corp.9 Hangzhou 310014 China

While dams cut off the migratory route of fish, and affect their growth and breeding, fishways are built to restore the con- nectivity of rivers and facilitate the life cycle of these migratory fish. This paper proposes a new kind of fishway called the ＂T shape fishway＂, and studies it by using both numerical simulations and physical experimental methods with the aim to design a fishway in China for migratory fish with swimming and jumping capability much poorer, such as schizothorax davidi and schizothorax prenanti, as compared with migratory fish in other places of the world, like trout and salmon. It is indicated that the range of velocity in each regular pool of the T shape fishway is from 0.42 m/s to 1.22 m/s when the flow discharge Q is 350 L/s, and there are no large vortex zones found there. This study shows that the T shape fishway can meet the requirements of these migratory fish quite well in terms of velocity and flow patterns in China.

关键词： fishway migratory fish baffle drop sill numerical simulation experiment