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Numerical analysis of the performance of a three-bladed vertical-axis turbine with active pitch control using a coupled unsteady Reynolds-averaged Navier-Stokes and actuator line model

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Journal of Hydrodynamics 2023年第3期35卷 516-532页

作者： rui-wen Zhao Angus C.w.Creech Ye Li Vengatesan Venugopal Alistair G.L.Borthwick Laboratory of Multi-function Towing Tank State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Engineering and Physical Sciences Heriot-Watt UniversityEdinburghUK School of Engineering The University of EdinburghEdinburghUK School of Engineering Computing and MathematicsUniversity of PlymouthPlymouthUK

In this paper,we present a numerical model of a vertical-axis turbine(VAT)with active-pitch torque *** model is based upon the wind and Tidal Turbine Embedded Simulator(wATTES)and wATTES-V turbine realisations in conjunction with the actuator line method(ALM),and uses OpenFOAM to solve the unsteady Reynolds-averaged Navier-Stokes(URANS)equations with two-equation k-εturbulence *** novel pitch-controlled system is based on an even pressure drop across the entire rotor to mitigate against dynamic stall at low tip speed *** numerical model is validated against experimental measurements and alternative numerical predictions of the hydrodynamic performance of a 1:6 scale UNH-RM2 hydrokinetic *** deploying the variable pitch mechanism exhibit improved turbine performance compared to measured data and fixed zero-pitch model ***-wake characteristics are investigated by examining the vorticity distribution near the *** pitch-controlled system is demonstrated to theoretically decrease turbulence generated by turbine rotations,mitigate the intensity of vortex shedding and size of detached vortices,and significantly enhance the performance of a vertical-axis hydrokinetic turbine for rated tip-speed ratios.

关键词： Vertical-axis turbine pitch control hydrodynamic performance unsteady Reynolds-averaged Navier-Stokes(URANS) numerical simulation

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Synthesis and Crystal Structure of Binuclear Silver(I) Complex with 2-nitro-(2-pyridylsulfanylmethyl)benzene

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Chinese Journal of Structural Chemistry 2005年第11期24卷 1306-1309页

作者： SONG rui-Feng Department of Chemistry and Chemical Engineering University of Science and Technology of Suzhou Suzhou 215009 China

The reaction of 2-nitro-（2-pyridylsulfanylmethyl）benzene L with silver nitrate produces a centrosymmetric binuclear complex bis（2-nitro-（2-pyridylsulfanylmethyl）benzene-N,S）- bis（nitrato-O,O）-disilver（Ⅰ）, [AgLNO3]2 1. The crystal is of triclinic, space group PI, with a = 7.383 （3）, b = 8.340（3）, c = 12..003（4） A, a = 95.069（6）, β = 93.498（5）, γ = 102.734（6）°, C24H20Ag2N6- O10S2, Mr= 832.32, V = 715.6（4） ,A^3, Z = 1, Dc = 1.931 g/cm^3, F（000） = 412,μ = 1.581 mm^-1, R= 0.0351 and wR = 0.0749 Each silver atom is tetrahedrally coordinated by two O atoms from bidentate nitrate, one S atom from a ligand and one N atom from another ligand. Furthermore, Ag- Ag interactions have been observed in the complex.

关键词： silver(Ⅰ) complex 2-nitro-(2-pyridylsulfanylmethyl)benzene crystal structure,Ag-Ag interactions

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Current Trend in Synthesis,Post-Synthetic Modifications and Biological Applications of Nanometal-Organic Frameworks(NMOFs)

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Chinese Journal of Chemistry 2019年第4期37卷 378-404页

作者： Ebenezer Baa Gary M.watkins rui.w.Krause Derek.N.Tantohb Department of Chemistry Rhodes UniversityPO Box 94Grahamstown6140South Africa Department of Applied Chemistry University of JohannesburgPO Box 524Auckland Park2006South Africa

Since the early reports of MOFs and their interesting properties,research involving these materials has grown wide in scope and *** synthetic approaches have ensued in view of obtaining materials with optimised properties,the extensive scope of application spanning from energy,gas sorption,catalysis biological applications has meant exponentially evolved over the *** far-reaching synthetic and PSM approaches and porosity control possibilities have continued to serve as a motivation for research on these *** respect to the biological applications,MOFs have shown promise as good candidates in applicati ons involving drug delivery,BioMOFs,sensing,imaging amongst *** being a while away from successful entry into the market,observed results in sensing,drug delivery,and imaging put these materials on the spot light as candidates poised to usher in a revolution in *** this regard,this review article focuses current approaches in synthesis,post functionalization and biological applications of these materials with particular attention on drug delivery,imaging,sensing and BioMOFs.

关键词： Current Trend Post-Synthetic Modifications Nanometal-Organic Frameworks(NMOFs)

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Quantum spin Hall effect in inverted InAs/GaSb quantum wells

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Frontiers of physics 2012年第2期7卷 200-207页

作者： Ivan Knez (1) rui-rui Du (1) 1. Department of Physics and Astronomy Rice University Houston TX 77251-1892 USA

we review the recent experimental progress towards observing quantum spin Hall effect in inverted InAs/GaSb quantum wells （Qws）. Low temperature transport measurements in the hybridization gap show bulk conductivity of a non-trivial origin, while the length and width dependence of con- ductance in this regime show strong evidence for the existence of helical edge modes proposed by Liu et al. [Phys. Rev. Lett., 2008, 100： 236601]. Surprisingly, edge modes persist in spite of compa- rable bulk conduction and show only weak dependence on magnetic field. we elucidate that seeming independence of edge on bulk transport comes due to the disparity in Fermi-wave vectors between the bulk and the edge, leading to a total internal reflection of the edge modes.

关键词： quantum spin Hall effect InAs/GaSb quantum wells topological insulators

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Resistance genes mediate differential resistance to pine defensive substances α-Pinene and H_(2)O_(2) in Bursaphelenchus xylophilus with different levels of virulence

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Journal of Forestry Research 2021年第4期32卷 1753-1762页

作者： Lin rui Hongbin Liu rui Liang Xiaoqin wu Co-Innovation Center for Sustainable Forestry in Southern China College of ForestryNanjing Forestry UniversityNanjing 210037JiangsuPeople’s Republic of China Jiangsu Key Laboratory for Prevention and Management of Invasive Species Nanjing Forestry UniversityNanjing 210037JiangsuPeople’s Republic of China

The pine wood nematode(PwN),Bursaphelenchus xylophilus(Steiner & Buhrer) Nickle,is the pathogen of pine wilt disease(PwD) which can devastate *** can be of hi gh or low severity and the mechanisms underlying the differences in virulence are ***,it is necessary to study the relationship between differentiation of PwN severity and its resistance to the main defensive substances of pine species(i.e.,α-pinene and H_(2)O_(2)).The feeding rate and fecundity of PwN was examined at different levels of virulence under conditions of a-pinene and H_(2)O_(2) ***,the expression patterns of the main resistance genes of PwN with different virulence were determined under conditions of α-pinene and H_(2)O_(2) *** feeding rate and fecundity of the high virulence strain AMA3 were higher than those of the low virulence strain *** expression levels of the autophagy gene BxATG5,cytochrome P450 gene BxCYP33 D3,and glutathione S-transferase genes BxGST1 and BxGST3 in AMA3 increased significantly upon exposure to α-pinene for 2 h,while these genes showed smaller degrees of upregulation in *** conditions of H_(2)O_(2) stress,the expression levels of BxATG5,catalase genes Bxy-ctl-1 and Bxy-ctl-2,and the 2-cysteine peroxiredoxin gene BxPrx in AMA3 were higher than those in *** findings suggest that high virulence PwN has greater resistance to pine defensive substances α-pinene and H_(2)O_(2) than low virulence PwN,and resistance genes mediate the differential resistance of PwN *** study will contribute to the clarification of the mechanism underlying virulence differentiation of PwN and will advance understanding of the pathogenic mechanism of PwD.

关键词： Pine wood nematode Virulence Defensive substances Autophagy gene Detoxification gene Antioxidant gene

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Reentry trajectory optimization for hypersonic vehicle satisfying complex constraints

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Chinese Journal of Aeronautics 2013年第6期26卷 1544-1553页

作者： Jiang Zhao rui Zhou School of Automation Science and Electrical Engineering Beihang University

The reentry trajectory optimization for hypersonic vehicle（HV）is a current problem of great *** complex constraints,such as waypoints for reconnaissance and no-fly zones for threat avoidance,are inevitably involved in a global strike *** the many direct methods,Gauss pseudospectral method（GPM）has been demonstrated as an effective tool to solve the trajectory optimization problem with typical ***,a series of diffculties arises for complex constraints,such as the uncertainty of passage time for waypoints and the inaccuracy of approximate trajectory near no-fly *** research herein proposes a multi-phase technique based on the GPM to generate an optimal reentry trajectory for HV satisfying waypoint and nofly zone *** kinds of specifc breaks are introduced to divide the full trajectory into multiple *** continuity conditions are presented to ensure a smooth connection between each pair of *** examples for reentry trajectory optimization in free-space flight and with complex constraints are used to demonstrate the proposed *** results show the feasible application of multi-phase technique in reentry trajectory optimization with waypoint and no-fly zone constraints.

关键词： Hypersonic vehicles Reentry trajectory optimization Multi-phase Gauss pseudospectral method(MGPM) waypoint No-fly zone

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Upconversion nanoscopy revealing surface heterogeneity of tumor-secreted extracellular vesicles

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Light(Science & Applications) 2023年第4期12卷 502-504页

作者： rui Pu Qiuqiang Zhan Centre for Optical and Electromagnetic Research South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China

Super-resolution microscopic imaging employing upconversion nanoparticles is applied to reveal the surface heterogeneity of tumor cell-derived small extracellular vesicles,i.e.,*** number of surface antigens of every extracellular vesicles can be quantified by both the high imaging resolution and stable brightness of upconversion *** method proves its great potential in nanoscale biological studies.

关键词： surface resolution revealing

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Constraining the non-Einsteinian polarizations of gravitational waves by pulsar timing array

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Science China(Physics,Mechanics & Astronomy) 2019年第7期62卷 63-75页

作者： rui Niu wen Zhao CAS Key Laboratory for Researches in Galaxies and Cosmology Department of Astronomy University of Science and Technology of China School of Astronomy and Space Science University of Science and Technology of China

Pulsar timing array(PTA) provides an excellent opportunity to detect the gravitational waves(Gws) in nanoHertz frequency *** particular, due to the larger number of "arms" in PTA, it can be used to test gravity by probing the non-Einsteinian polarization modes of Gws, including two spin-1 shear modes labeled by "sn" and "se", the spin-0 transverse mode labeled by "b" and the longitudinal mode labeled by "l". In this paper, we investigate the capabilities of the current and potential future PTAs, which are quantified by the constraints on the amplitudes parameters(c_b, c_(sn), c_(se), c_l), by observing an individual supermassive black hole binary in Virgo cluster. we find that for binary with total mass M_c= 8.77 × 10~8 M_⊙ and Gw frequency f = 10^(-9) Hz, the PTA at current level can detect these Gw modes if c_b> 0.00106, c_l> 0.00217, c_(se)> 0.00271, c_(sn)> 0.00141, which will be improved by about two orders if considering the potential PTA in SKA era. Interesting enough, due to effects of the geometrical factors, we find that in SKA era, the constraints on the l, sn, se modes of Gws are purely dominated by several pulsars, instead of the full pulsars in PTA.

关键词： gravitational waves pulsar timing array

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Experimental Study on Diesel Spray and Flame Asymmetry Characteristics of Dual-Orifice Nozzles for a Medium-Speed Engine

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Journal of Thermal Science 2025年第1期 303-322页

作者： JU Dehao LIU rui ZHENG Liang DENG Jiahui ZHANG wenzheng HUO Jinlu HUANG Li Shanghai Marine Diesel Engine Research Institute National Key Laboratory of Marine Engine Science and Technology Key Laboratory for Power Machinery and Engineering Ministry of EducationShanghai Jiao Tong University

The asymmetry of the multi-orifice spray will cause uneven heat load of the marine diesel engine,thereby affecting its working performance and service ***,an in-depth understanding of the spray and flame characteristics of multi-orifice nozzles will guide the optimization of the nozzle structure,needle design and diesel atomization and combustion *** this reason,four groups of dual-orifice nozzles with different hole diameters(0.1-0.55 mm) and mass flow rates covering the typical marine medium-speed diesel injections are designed and customized,and the constant volume chamber(CVC) with high temperature and pressure is used to simulate the actual in-cylinder working conditions of the diesel engine for the spray visualization *** study the asymmetry of the fuel sprays discharged from a diesel injector,the multi-orifice nozzle is simplified as a dual-orifice nozzle in this *** with X-ray Computed Tomography(CT) imaging technology,the influences of the nozzle internal structure on the spray and flame asymmetry are studied in the constructed supercritical *** is found that the asymmetry of the inlet angle and the equivalent length-diameter ratio is positively correlated with the inconsistency of the dual *** an increase in the injection pressure and nozzle diameter,the asymmetry of the dual spray becomes more pronounced,resulting in greater disparities in the ignition delay times and ignition positions of the two ***,the increase in nozzle diameter also leads to combustion instability,resulting in a flame with a serrated *** the increase of ambient temperature,the proportion of liquid phase in the jet decreases and the relative density of spray front decreases.

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Thermodynamic Behavior Research Analysis of Twin-roll Casting Lead Alloy Strip Process

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Chinese Journal of Mechanical Engineering 2017年第2期30卷 352-362页

作者： Chengcan JIANG Yannian rui School of Mechanical and Electric Engineering SoochowUniversityJiangsu 215021China

The thermodynamic behavior of twin-roll casting （TRC） lead alloy strip process directly affects the forming of the lead strip, the quality of the lead strip and the production efficiency. However, there is little research on the thermodynamics of lead alloy strip at home and abroad. The TRC lead process is studied in four parameters： the pouring temperature of molten lead, the depth of molten pool, the roll casting speed, and the rolling thickness of continuous casting. Firstly, the thermodynamic model for TRC lead process is built. Secondly, the thermodynamic behavior of the TRC process is simulated with the use of Fluent. Through the thermodynamics research and analysis, the process parameters of cast rolling lead strip can be obtained： the pouring temperature of molten lead： 360-400 ℃, the depth of molten pool： 250-300 mm, the roll casting speed： 2.5-3 m/min, the rolling thickness： 8-9 mm. Based on the above process parameters, the optimal parameters（the pouring temperature of molten lead： 375-390 ℃, the depth of molten pool： 285-300 mm, the roll casting speed： 2.75-3 m/min, the rolling thickness： 8.5-9 mm） can be gained with the use of the orthogonal experiment. Finally, the engineering test of TRC lead alloy strip is carried out and the test proves the thermodynamic model is scientific, necessary and correct. In this paper, a detailed study on the thermodynamic behavior of lead alloy strip is carried out and the process parameters of lead strip forming are obtained through the research, which provide an effective theoretical guide for TRC lead alloy strip process.

关键词： TRC lead alloy strip Thermodynamic model Thermodynamic behavior Theoretical guide

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