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A quasi-one-dimensional CFD Model for Multistage Turbomachines

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Journal of Thermal Science 2008年第1期17卷 7-20页

作者： Olivier Léonard Olivier Adam University of Liège-Turbomachinery Group LiegeBelgium Professor University of Liège-Turbomachinery Group LiegeBelgium

The objective of this paper is to present a fast and reliable CFD model that is able to simulate stationary and transient operations of multistage compressors and turbines. This analysis tool is based on an adapted version of the Euler equations solved by a time-marching, finite-volume method. The Euler equations have been extended by including source terms expressing the blade-flow interactions. These source terms are determined using the ve- locity triangles and a row-by-row representation of the blading at mid-span. The losses and deviations undergone by the fluid across each blade row are supplied by correlations. The resulting flow solver is a performance pre- diction tool based only on the machine geometry, offering the possibility of exploring the entire characteristic map of a multistage compressor or turbine. Its efficiency in terms of CPU time makes it possible to couple it to an optimization algorithm or to a gas turbine performance tool. Different test-cases are presented for which the calculated characteristic maps are compared to experimental ones.

关键词： multistage compressors turbines quasi-one-dimensional meanline analysis

Superconductivity at 10.4 K in a novel quasi-one-dimensional ternary molybdenum pnictide K2Mo3As3

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Science Bulletin 2018年第15期63卷 952-956页

作者： Qing-Ge Mu Bin-Bin Ruan Kang Zhao Bo-Jin Pan Tong Liu Lei Shan Gen-Fu Chen Zhi-An Ren Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China

Here we report the discovery of the first ternary molybdenum pnictide based superconductor K2Mo3As3. Polycrystalline samples were synthesized by the conventional solid state reaction method. X-ray diffrac- tion analysis reveals a quasi-one-dimensional hexagonal crystal structure with （Mo3As3）2 linear chains separated by K^＋ ions, similar as previously reported K2Cr3As3, with the space group of P-6m2 （No. 187） and the refined lattice parameters a = 10.145（5） A and c = 4.453（8） A. Electrical resistivity, magnetic susceptibility, and heat capacity measurements exhibit bulk superconductivity with the onset Tc at 10.4 K in K2Mo3As3 which is higher than the isostructural Cr-based superconductors. Being the same group VIB transition elements and with similar structural motifs, these Cr and Mo based superconductors may share some common underlying origins for the occurrence of superconductivity and need more investigations to uncover the electron pairing within a quasi-one-dimensional chain structure.

关键词： Superconductivity K2Mo3As3 quasi-one-dimensional Chevrel phase

Chemical vapor deposition synthesis and Raman scattering investigation of quasi-one-dimensional ZrS_(3)nanoflakes

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Nano Research 2023年第7期16卷 10567-10572页

作者： Yang Chen Yuanyuan Jin Junqiang Yang Yizhang Ren Zhuojun Duan Xiao Liu Jian Sun Song Liu Xukun Zhu Xidong Duan Institute of Chemical Biology and Nanomedicine(ICBN) College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Hunan Key Laboratory of Two-dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China School of Physics and Electronics Central South UniversityChangsha 410083China

quasi-one-dimensional ZrS_(3)nanoflakes attract intense interest attributed to their superior electrical and optical anisotropy,stemming from the low symmetry in the crystal ***,the conventional chemical vapor transport method for synthesizing bulk ZrS_(3)is limited by morphology and size *** is highly desirable to propose a facile way to precisely synthesize ZrS_(3)*** this work,the chemical vapor deposition method is proposed as a feasible way to synthesize ZrS_(3)*** effects of various substrates and temperatures on ZrS_(3)synthesis have been *** the as-grown ZrS_(3),good crystallinity is confirmed with X-ray diffraction and transmission electron *** structure and interlayer coupling are investigated with Raman scattering *** strong in-plane anisotropy and interlayer coupling of the ZrS_(3)nanoflakes are illustrated with angle-resolved Raman spectroscopy and temperature-dependent Raman characterization,*** study demonstrates a feasible way for the synthesis of transition metal trisulfides,which may shed new light on the research of other two-dimensional anisotropic transition metal materials.

关键词： quasi-one-dimensional ZrS_(3)nanoflakes chemical vapor deposition method in-plane anisotropy interlayer coupling

CeAu_(2)In_(4):A candidate of quasi-one-dimensional antiferromagnetic Kondo lattice

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Chinese Physics B 2021年第8期30卷 152-157页

作者： Meng Lyu Hengcan Zhao Jiahao Zhang Zhen Wang Shuai Zhang Peijie Sun Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China

Needle-like single crystals of CeAu_(2)In_(4)have been grown from In flux and characterized as a new candidate of quasi-one-dimensional Kondo lattice compound by crystallographic,magnetic,transport,and specific-heat measurements down to very low *** observe an antiferromagnetic transition at T_(N)≈0.9 K,a highly non-mean-field profile of the corresponding peak in specific heat,and a large Sommerfeld coefficientγ=369 mJ·mol^(-1)·K^(-2).The Kondo temperature T_(K)is estimated to be 1.1 K,being low and comparable to *** Fermi liquid behavior is observed deep into the magnetically ordered phase,the Kadowaki-Woods ratio is much reduced relative to the expected value for Ce compounds with Kramers doublet ground ***,this feature shares striking similarities to that of the prototypical quasi-one-dimensional compounds YbNi_(4)P_(2) and CeRh_(6)Ge_(4) with tunable ferromagnetic quantum critical *** the shortest Ce-Ce distance along the needle direction,CeAu_(2)In_(4)appears to be an interesting model system for exploring antiferromagnetic quantum critical behaviors in a quasi-one-dimensional Kondo lattice with enhanced quantum fluctuations.

关键词： heavy fermion quasi-one-dimensional Kondo lattice magnetic phase transition

The kink-soliton and antikink-soliton in quasi-one-dimensional nonlinear monoatomic lattice

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Science China(Physics,Mechanics & Astronomy) 2005年第2期48卷 150-157页

作者： XU Quan1 & TIAN Qiang2 1. Scientific and Technological Office, Daqing Teacher College, Daqing 163712, China 2. Department of Physics , Beijing Normal University, Beijing 100875, China Scientific and Technological Office Daqing Teacher College Daqing China Department of Physics Beijing Normal University Beijing China

The quasi-one-dimensional nonlinear monoatomic lattice is analyzed. The kink-soliton and antikink-soliton are presented. When the interaction of the lattice is strong in the x-direction and weak in the y-direction, the two-dimensional (2D) lattice changes to a quasi-one-dimensional lattice. Taking nearest-neighbor interaction into account, the vibration equation can be transformed into the KPI, KPII and MKP equation. Considering the cubic nonlinear potential of the vibration in the lattice, the kink-soliton solution is presented. Considering the quartic nonlinear potential and the cubic interaction potential, the kink-soliton and antikink-soliton solutions are presented.

关键词： two-dimensional nonlinear lattice, quasi-one-dimensional nonlinear lattice, kink-soliton, antikink-soliton.

Metal-Insulator Transition of Peierls Type in quasi-one-dimensional Crystals of TTT<sub>2</sub>I<sub>3</sub>

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Advances in Materials Physics and Chemistry 2017年第5期7卷 212-222页

作者： Silvia Andronic Anatolie Casian Department of Computers Informatics and Microelectronics Technical University of Moldova Chisinau Moldova

We investigate the metal-insulator transition in quasi-one-dimensional organic crystals of tetrathiotetracene-iodide, TTT2I3, in the 2D model. A crystal physical model is applied which takes into account two the most important hole-phonon interaction mechanisms. one is similar to that of deformation potential and the other is of polaron type. The scattering on defects is also considered and it is crucial for the explanation of the transition. The phonon polarization operator and the renormalized phonon spectrum are calculated in the random phase approximation for different temperatures applying the method of Green functions. We show that the transition is of Peierls type. The effect of lattice distortion on the dispersion of renormalized acoustic phonons is analyzed.

关键词： quasi-one-dimensional Organic Crystals TTT2I3 Polarization Operator Metal-Insulator Transition Peierls Transition Interchain Interaction Renormalized Phonons

From titanates to TiO_2 nanostructures: Controllable synthesis, growth mechanism, and applications

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Science China Chemistry 2012年第11期55卷 2334-2345页

作者： XU DongSheng LI JianMing YU YuXiang LI JingJian Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Science and Technology on Electro-Optical ln/brmation Security Control Laboratory Sanhe 065201China School of Chemistry and Chemical Engineering South China Univerxity of TechnologyGuangzhou 510640China

The design and fabrication of nanostmctures based on titanium dioxide （TiO2） have attracted much attention because of their low cost, non-toxicity, stability, and potential applications in industry and technology. Recently, one-dimensional （1 D） struc- tured titanates have been used as titanium source to prepare TiO2 nanostructures with various crystalline phases, shapes, sizes, exposed facets, and hierarchical structures. Among the synthetic strategies, hydrothermal method is a facile route to controlla- ble preparation of well-crystalline TiO2 in one step. Herein, we review our recent progress in transferring 1D titanates into TiO2 nanostructures through hydrothermal method, including the transformation mechanism and applications.

关键词： TiO2 titanate hydrothermal nanostructure quasi-one-dimensional

From titanates to TiO2 nanostructures:Controllable synthesis,growth mechanism,and applications

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中国科学:化学 2012年第11期42卷 1649-1649页

作者： XU DongSheng 1,2,LI JianMing 1,YU YuXiang 1,3 & LI JingJian 1 1 Beijing National Laboratory for Molecular Sciences,State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China 2 Science and Technology on Electro-Optical Information Security Control Laboratory,Sanhe 065201,China 3 School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Science and Technology on Electro-Optical Information Security Control Laboratory Sanhe 065201 China School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 China

The design and fabrication of nanostructures based on titanium dioxide (TiO 2) have attracted much attention because of their low cost,non-toxicity,stability,and potential applications in industry and ***,one-dimensional (1D) structured titanates have been used as titanium source to prepare TiO 2 nanostructures with various crystalline phases,shapes,sizes,exposed facets,and hierarchical *** the synthetic strategies,hydrothermal method is a facile route to controllable preparation of well-crystalline TiO 2 in one ***,we review our recent progress in transferring 1D titanates into TiO 2 nanostructures through hydrothermal method,including the transformation mechanism and applications.

关键词： TiO2 titanate hydrothermal nanostructure quasi-one-dimensional