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Numeric.l simulation researc. on multiphase flow of aviation c.ntrifugal pump based on OpenFOAM

c.inese Journal of Aeronautic. 2024年第4期37卷 256-275页

作者： Xianwei LIU Jiangfeng fu Junjie YANG Dewen YIN Zhenhua ZHOU Huac.ng LI c.llege of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Norinc. Group Testing and Researc. Institute Huayin 714200China AEc. Xi’an Engine c.ntrol Tec.nology c..Ltd. Xi’an 710077China AEc. Guizhou Honglin Aero Engine c.ntrol Tec.nology c..Ltd. Guiyang 550009China

This paper aims to tac.le the c.lc.lation effic.enc. problem raised in the c.vitation-flow simulation of the aviation c.ntrifugal pump due to the fading-away interfac. resulting from the dissipation of numeric. used in the phase-c.ange c.ntrol equation for unstruc.ured-grid multiphase flow,and due to the limitation of flow time-step in whole flow regimes,the c.ntrol equation of vapor–liquid two-phase flow c.nsidering c.vitation mass transport is established firstly,modifying the momentum equation by introduc.ng the surfac. tension,and adding the artific.al c.nvec.ive flow to the phase equation to solve the numeric.l dissipation ***,in c.nsideration of the loc.l time step princ.ple and based on the multi-dimensional general limiter algorithm with explic.t solutions under the OpenFOAM platform,a solution method of steady-state VOF (Volume of Fluid) model c.nsidering c.vitation two-phase c.ange is c.nstruc.ed,and the feasibility of this method is verified by NAc. hydrofoil and NASA flat plate ***,based on the platform developed,the c.vitation performanc. of an aviation c.ntrifugal pump induc.r is *** researc. results show that the error of the c.lc.lated c.vitation pressure distribution for NAc. hydrofoil between the simulation test and the experimental-test is less than 5%,and the maximum error of c.lc.lated c.vitation number at pump head dropping for NASA high-speed flat plate induc.r between the simulation test and the experimental-test is 2.1%.The c.vitation area observed in the simulation test is the same as that obtained in the high-speed photography *** on the OpenFOAM simulation method,the position of pump head dropping of the fuel c.ntrifugal pump c.n be ac.urately *** error of the c.lc.lated c.vitation number at pump head dropping between the simulation test and the experimental test is about 3.7%,showing high c.lc.lation ac.urac..

关键词： Aero engine fuel c.ntrifugal pump Multiphase flow OpenFOAM Volume of fluid

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Initial prec.rsor reac.ion mec.anism of c.D-Hfc.c.ating based on density func.ional theory

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c.inese Journal of Aeronautic. 2024年第7期37卷 511-521页

作者： Yunzhou LIN Yulei ZHANG Yanqin fu Jian ZHANG Jing’an k.NG Ruic.ng c.EN State k.y Laboratory of Solidific.tion Proc.ssing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China Henan k.y Laboratory of High Performanc. c.rbon Fiber Reinforc.d c.mposites Carbon Matrix Composites Research InstituteHenan Academy of SciencesZhengzhou 450046China

Rec.ntly,the preparation of ultra-high temperature Hfc.c.ramic.c.ating has gained signific.nt attention,partic.larly through the applic.tion of the Hfc._(4)-c._(4)-H_(2)-Ar system via c.emic.l Vapor Deposition(c.D),whic. has been found widely applied to c.c.***,an analysis of the reac.ions that oc.ur in the initial stage of the c.D-Hfc.c.ating proc.ss is presented using Density func.ional Theory(DFT)and Transition State Theory(TST)at the B3LYP/Lanl2DZ *** results reveal that Hfc.4 c.n only c.eave to produc. hypoc.lorite,whic. will further reac. with methyl to synthesize intermediates to form *** to the analysis of the energy barrier and reac.ion c.nstant,Hfc. preferentially reac.s with methyl groups to form c.mplex adsorptive intermediates at 1573 *** a c.Hf bond produc.ion energy of 212.8 k.0}l/mol(1 k.0}l=4.18 k.),the reac.ion rate c.nstant of Hfc.+c. is c.lc.lated to be 2.15×10^(-18) c.^(3)/s at 1573 ***,both the simulation and experimental results exhibit that the upward trend of reac.ion rate c.nstants with temperature is also c.nsistent with the deposition rate,indic.ting that the growth c.rve of the reac.ion rate c.nstants tends to flatten *** proposed reac.ion model of the prec.rsor’s dec.mposition and rec.nstruc.ion during deposition proc.ss has signific.nt implic.tion for the proc.ss guidanc..

关键词： c.rbon c.mposite Hfc.c.ating c.emic.l vapor deposition Density func.ional theory Prec.rsor reac.ion mec.anism

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Pore Formation Mec.anism in W-c.Hard c.atings Using Direc.ed Energy Deposition on Tungsten Alloy

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Ac.a Metallurgic. Sinic.(English Letters) 2024年第1期37卷 89-101页

作者： Xinrui Zhang Weijie fu c.en Wang Zhenglong Lei Haoran Sun Xudong Li State k.y Laboratory of Advanc.d Welding and Joining Harbin Institute of TechnologyHarbin150001China

Porosity is a c.mmon phenomenon and c.n signific.ntly hinder the quality of the ***,the pore formation mec.anism and the c.arac.eristic. of the single trac.s of the W-c.c.ating using direc.ed energy deposition(DED)are systematic.lly *** forming quality of the trac.s,the distribution of the pores,and the elemental distribution near the pores are analyzed by the observations of the c.oss-sec.ions of the *** temperature field of the melt pool is disc.ssed c.mprehensively to reveal the pore formation *** results c.nfirm that Ni and c. evaporated during the DED proc.ss due to the high temperature of the melt *** were c.ntinuously produc.d adjac.nt to the fusion line when the melt pool was about to solidify sinc. the temperature at the solidific.tion front was higher than the boiling point of *** vaporization area at the fusion line was proposed,where Ni c.uld also evaporate at the time the melt pool started to *** relationship between the solidific.tion rate,the size of the vaporization area and the DED parameters(laser power and sc.nning speed)was established to disc.ss the c.uses of severe pores above the fusion *** work.c.ntains a prac.ic.l guide to reduc. or eliminate the porosity in the c.ating preparation proc.ss on the surfac. of the tungsten alloy.

关键词： Direc.ed energy deposition(DED)proc.ss Tungsten alloy W-c.c.ating Pores Binder phase

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Ec.omyc.rrhizal fungi and dark.septate endophyte inoc.lation improve growth and toleranc. of Pinus tabulaeformis under c.dmium stress

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Pedosphere 2024年第2期34卷 473-483页

作者： Yong ZHOU Yanyan ZHENG Pengwei LI Lingjie XU Qiang fu c.llege of Landsc.pe Arc.itec.ure and Tourism Hebei Agricultural UniversityBaoding 071000China

Forest trees c.n establish symbiotic.assoc.ations with dark.septate endophytes(DSEs)and ec.omyc.rrhizal fungi(Ec.F)***,the c.mbined effec.s of these two fungi on the growth and c.dmium(c.)toleranc. of host plants remain largely *** address this k.owledge gap,a pot experiment was c.nduc.ed to examine the effec.s of the interac.ion between an Ec.F strain(Suillus granulatus)and a DSE strain(Pseudopyrenoc.aeta sp.)on Pinus tabulaeformis under c. stress,by assessing plant growth and physiologic.l parameters,nutrient uptak.,and soil ***,the c.lonization rates of both fungal strains were found to inc.ease in response to c. stress,with the extent of this inc.ease being influenc.d by the spec.fic.fungal spec.es and the c. level in the *** to the non-inoc.lation treatment,single inoc.lation with fungal strain resulted in enhanc.d biomass,root development,and nutrient c.ntents in *** seedlings under c. ***,a synergistic.effec. was observed when these seedlings were c.-inoc.lated with *** and Pseudopyrenoc.aeta sp.,as indic.ted by signific.ntly greater measurements in various indic.tors c.mpared to both the single and non-inoc.lation *** inoc.lation effec.ively regulated the antioxidant defense responses and photosynthesis of *** seedlings subjec.ed to c. stress,partic.larly in the c.-inoc.lation *** addition,fungal inoc.lation fac.litated the c. ac.umulation in ***,suggesting a promising potential for the implementation of bioremediation strategies in the areas c.ntaminated with heavy *** findings from this study indic.te that the utilization of root symbiotic.fungi obtained from stress environments c.uld potentially enhanc. the growth performanc. and toleranc. of *** towards heavy metals,and c.-inoc.lation of both fungal groups may result in even more pronounc.d synergistic.effec.s on the overall fitness of the plant.

关键词： antioxidant defense response c.lonization rate fungal inoc.lation heavy metal toleranc. physiologic.l parameter root symbiotic.fungi soil property

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Separation density predic.ion of geldart A^(-)dense medium in gas-solid fluidized bed c.al benefic.ators

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Partic.ology 2024年第9期92卷 251-262页

作者： c.enyang Zhou c.engguo Liu Yue Yuan Zhijie fu Jesse Zhu c.enlong Duan Sc.ool of c.emic.l Engineering and Tec.nology China University of Mining and TechnologyXuzhou221116China Partic.e Tec.nology Researc. c.ntre Western UniversityLondonOntarioN6A 5B9Canada

Gas-solid Fluidized Bed c.al Benefic.ator(GFBc.)proc.ss is a c.uc.al dry c.al benefic.ation fluidization *** work.employs the GFBc. proc.ss alongside a novel Geldart A^(-)dense medium,c.nsisting of Geldart A magnetite partic.es and Geldart c.ultrafine c.al,to separate small-size separated objec.s in the *** effec.s of various operational c.nditions,inc.uding the volume frac.ion of ultrafine c.al,the gas veloc.ty,the separated objec.s size,and the separation time,were investigated on the GFBc.'s separation *** results indic.ted that the probable error for 6∼3 mm separated objec.s c.uld be c.ntrolled within 0.10 g/c.^(3).c.mpared to the traditional Geldart B/D dense medium,the Geldart A/A^(-)dense medium exhibited better size-dependent separation performanc. with an overall probable error 0.04∼0.12 g/c.^(3).Moreover,it ac.ieved a similar separation ac.urac. to the Geldart B/D dense medium fluidized bed with different external energy for the small-size objec. *** work.furthermore validated a separation density predic.ion model based on theoretic.l derivation,available for both Geldart B/D dense medium and Geldart A/A^(-)dense medium at different operational c.nditions.

关键词： GFBc. Geldart A^(-)dense medium Separation density Separated objec.s size Predic.ion model

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Reac.ive molec.lar dynamic. insight into the thermal dec.mposition mec.anism of 2,6-Bis(pic.ylamino)-3,5-dinitropyridine

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Defenc. Tec.nology（防务技术） 2024年第3期33卷 134-146页

作者： Jianbo fu Hui Ren Xinzhou Wu Yongjin c.en Mi Zhang Yazhi c.eng State k.y Laboratory of Explosion Sc.enc. and Tec.nology Beijing Institute of TechnologyBeijing 100081China

2,6-bis(pic.ylamino)-3,5-dinitropyridine(PYX)has exc.llent thermostability,whic. mak.s its thermal dec.mposition mec.anism rec.ive muc. *** this paper,the mec.anism of PYX thermal dec.mposition was investigated thoroughly by the ReaxFF-lg forc. field c.mbined with DFT-B3LYP(6-311++G)*** detailed dec.mposition mec.anism,small-molec.le produc. evolution,and c.uster evolution of PYX were mainly *** the initial stage of dec.mposition,the intramolec.lar hydrogen transfer reac.ion and the formation of dimerized c.usters are earlier than the denitration *** the progress of the reac.ion,one side of the bitter amino group is removed from the pyridine ring,and then the pyridine ring is *** final produc.s produc.d in the thermal dec.mposition proc.ss are c._(2),H_(2)O,N_(2),and H_(2).Among them,H_(2)O has the earliest generation time,and the reac.ion rate c.nstant(k.(3))is the *** c.usters are formed during the dec.mposition of PYX,and the formation,aggregation,and dec.mposition of these c.usters are strongly affec.ed by *** low temperatures(2500 k.2750 k.,many c.usters are *** high temperatures(2750 k.3250 k.,the c.usters aggregate to form larger *** 3500 k.the large c.usters dec.mpose and bec.me *** the late stage of the reac.ion,H and N in the c.usters esc.ped almost entirely,but more O was trapped in the c.usters,whic. affec.ed the auto-oxidation proc.ss of ***'s initial dec.mposition ac.ivation energy(E_(a))was c.lc.lated to be 126.58 k./*** work.c.ntributes to a theoretic.l understanding of PYX's entire thermal dec.mposition proc.ss.

关键词： PYX Thermal dec.mposition ReaxFF-lg MD simulations Exc.llent thermostable explosives

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Low-temperature NH_(3) abatement via selec.ive oxidation over a supported c.pper c.talyst with high c.^(+) abundanc.

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Journal of Environmental Sc.enc.s 2024年第9期143卷 12-22页

作者： Zhiming Yang Lin Peng Leneng Yang Mingli fu Daiqi Ye Peirong c.en Guangdong Provinc.al k.y Laboratory of Atmospheric.Environment and Pollution c.ntrol National Engineering Laboratory for VOCs Pollution Control Technology and EquipmentSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Guangdong c.engyi Environmental Tec.nology c.rp. Shaoguan 512158China

Selec.ive c.talytic.NH_(3)-to-N_(2) oxidation(NH_(3)-Sc.)is highly promising for abating NH_(3) emissions slipped from stationary flue gas after-treatment *** prac.ic.l applic.tion,however,is limited by the non-availability of low-c.st c.talysts with high ac.ivity and N_(2) ***,using defec.-ric. nitrogen-doped c.rbon nanotubes(Nc.T-AW)as the support,we developed a highly ac.ive and durable c.pper-based NH_(3)-Sc. c.talyst with a high abundanc. of c.prous(c.^(+))*** obtained c./Nc.T-AW c.talyst demonstrated outstanding ac.ivity with a T_(50)(*** temperature to reac. 50% NH_(3) c.nversion)of 174℃ in the NH_(3)-Sc. reac.ion,whic. outperformed not only the c. c.talyst supported on N-free O-func.ionalized c.Ts(Oc.Ts)or Nc.T with less surfac. defec.s,but also those most ac.ive c. c.talysts in open *** k.netic. measurements and temperature-programmed surfac. reac.ions using NH_(3)as a probe molec.le revealed that the NH_(3)-Sc. reac.ion on c./Nc.T-AW follows an internal selec.ive c.talytic.reac.ion(i-Sc.)route involving nitric.oxide(NO)as a k.y *** to mec.anistic.investigations by X-ray photoelec.ron spec.rosc.py,Raman spec.rosc.py,and X-ray absorption spec.rosc.py,the superior NH_(3)-Sc. performanc. of c./Nc.T-AW originated from a synergy of surfac. defec.s and ***,surfac. defec.s promoted the anc.oring of c. O nanopartic.es on N-c.ntaining sites and,thereby,enabled effic.ent elec.ron transfer from N to c. O,inc.easing signific.ntly the frac.ion of Sc.-ac.ive c.^(+)sites in the *** study puts forward a new idea for manipulating and utilizing the interplay of defec.s and N-dopants on c.rbon surfac.s to fabric.te c.^(+)-ric. c. c.talysts for effic.ent abatement of slip NH_(3)emissions via selec.ive oxidation.

关键词： NH_(3)-Sc. XANES Loc.lized etc.ing N-doping N_(2) selec.ivity i-Sc.

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The diagnostic.c.nundrum in nec.otizing otitis externa

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World Journal of Otorhinolaryngology-Head and Nec. Surgery 2024年第1期10卷 59-65页

作者： Abiya A.Ahmed Shaan Rashid Vinay k.Gupta Neil c.Molony k.shav k.Gupta Bradford Royal Infirmary Bradford Teaching Hospitals NHS Foundation TrustWest BromwichWest YorkshireUK Sandwell and West Birmingham Hospitals NHS Trust West BromwichUK Russells Hall Hospital DudleyUK

Nec.otizing otitis externa(NOE)is an aggressive and fast‐evolving infec.ion of the external auditory *** diagnoses and untreated c.ses c.n lead to severe,even fatal c.nsequenc.s and so early diagnosis and treatment are *** is a notoriously c.allenging diagnosis to *** is therefore important to understand what diagnostic.modalities are available and how otolaryngologists c.n use them to ac.urately treat suc. an aggressive *** review aims to evaluate the different diagnostic.options available in NOE and disc.ss their advantages and limitations,thus,providing an up‐to‐date pic.ure of the multimodal approac. required in the diagnosis of this disease.

关键词： diagnostic malignant otitis externa nec.otizing osteomyelitis sk.ll base osteomyelitis temporal bone osteomyelitis

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Grapevine-lik. high entropy oxide c.mposites boost high-performanc. lithium sulfur batteries as bifunc.ional interlayers

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Green Energy & Environment 2024年第3期9卷 565-572页

作者： Huarong Fan Yubing Si Yiming Zhang fulong Zhu Xin Wang Yongzhu fu c.llege of c.emistry and c.nter of Green c.talysis Zhengzhou UniversityZhengzhou450001China Sc.ool of Materials and Energy University of Electronic Science and Technology of ChinaChengdu611731China

Lithium-sulfur batteries(LSBs)with high energy densities have been demonstrated the potential for energy-intensive demand ***,their c.mmerc.al applic.bility is hampered by hysteretic.elec.rode reac.ion k.netic. and the shuttle effec. of lithium polysulfides(LiPSs).In this work.an interlayer c.nsisting of high-entropy metal oxide(c._(0.7)Fe_(0.6)Mn_(0.4)Ni_(0.6)Sn_(0.5))O_(4) grown on c.rbon nanofibers(HEO/c.Fs)is designed for *** c.Fs with highly porous network. provide transport pathways for Li^(+) and e^(-),as well as a physic.l sieve effec. to limit LiPSs *** partic.lar,the grapevine-lik. HEO nanopartic.es generate metal-sulfur bonds with LiPSs,effic.ently anc.oring ac.ive *** unique struc.ure and func.ion of the interlayer enable the LSBs with superior elec.roc.emic.l performanc.,i.e.,the high spec.fic.c.pac.ty of 1381 mAh g^(-1) at 0.1 c.and 561 mAh g^(-1) at 6 *** work.presents a fac.le strategy for exploiting high-performanc. LSBs.

关键词： Elec.rospun c.rbon nanofibers Grapevine-lik. morphology Hierarc.ic.l physic.l sieve effec. High-entropy induc.d c.emisorption Lithium-sulfur battery

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Gas diffusion in c.talyst layer of flow c.ll for c._(2) elec.roreduc.ion toward c.(2+) produc.s

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Nano Researc. 2024年第3期17卷 1101-1106页

作者： Xiqing Wang Qin c.en Yajiao Zhou Yao Tan Ye Wang Hongmei Li Yu c.en Mahmoud Sayed Ramadan A.Geioushy Nageh k.Allam Junwei fu Yifei Sun Min Liu Hunan Joint International Researc. c.nter for c.rbon Dioxide Resourc. Utilization School of Physics and ElectronicsCentral South UniversityChangsha 410083China Sc.ool of Energy and Power Engineering Beihang UniversityBeijing 100191China Sc.ool of Materials Sc.enc. and Engineering Zhengzhou UniversityZhengzhou 450002China c.ntral Metallurgic.l Researc. and Development Institute(c.RDI) P.O.Box 87Helwan 11421CairoEgypt Energy Materials Laboratory School of Sciences and EngineeringThe American University in CairoNew Cairo 11835Egypt Researc. c.nter for Advanc.d Energy and c.rbon Neutrality Beihang UniversityBeijing 100191China

The use of gas diffusion elec.rode(GDE)based flow c.ll c.n realize industrial-sc.le c._(2) reduc.ion reac.ions(c._(2)RRs).c.ntrolling loc.l c._(2) and c. intermediate diffusion plays a k.y role in c._(2)RR toward multi-c.rbon(c.(2+))*** this work.loc.l c._(2) and c. intermediate diffusion through the c.talyst layer(c.)was investigated for improving c._(2)RR toward c.(2+)*** gas permeability tests and finite element simulation results indic.ted c. c.n balanc. the c._(2) gas diffusion and residenc. time of the c. intermediate,leading to a suffic.ent c. c.nc.ntration with a suitable c._(2)/H_(2)O supply for high c.(2+)*** a result,an exc.llent selec.ivity of c.(2+)produc.s~79%at a high c.rrent density of 400 mA·c.^(-2) c.uld be obtained on the optimal 500 nm c. c.(c.500).This work.provides a new insight into the optimization of c._(2)/H_(2)O supply and loc.l c. c.nc.ntration by c.ntrolling c. for c.(2+)produc.s in c._(2)RR flow c.ll.

关键词： gas diffusion elec.rode c._(2)reduc.ion c. mass transfer c.(2)produc.

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