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Journal of Thermal Science 2022年第1期31卷 25-34页

作者： gao chuang HUANG Weiguang Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China

A 2 MW gas turbine engine has been developed for the distributed power *** engine features a 7:1 pressure ratio radial inflow *** this paper,influences of various geometry features are investigated including turbine tip and backface *** addition to the clearances,the effects of the inducer deep scallop and exducer rounded trailing edge are ***,geometric features associated with a split rotor(separate inducer and exducer)are *** geometry features are investigated numerically using *** of the numerical results is also compared to experimental data acquired during engine test to validate the CFD results.

关键词： radial turbine high pressure ratio scallop leakage clearance

Multiphysics Design of a High-Speed Permanent Magnet Machine for a Micro Gas Turbine Application

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Journal of Thermal Science 2022年第1期31卷 251-260页

作者： ZHENG Mengzi HUANG Weiguang gao chuang WU Fuxian Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Light-duty Gas Turbine Chinese Academy of SciencesBeijing 100190China Helan Turbines Co. LtdShanghai 210815China

This paper presents a detailed and comprehensive multiphysics design process of an 80 kW, 60 000 r/min high-speed permanent magnet machine (HSPMM) for a micro gas turbine application. First, the preliminary design of the HSPMM is carried out according to the mechanical and electromagnetic theory. Afterwards, the influence of carbon fiber sleeve (CFS) thickness, rotor diameter and core length on rotor stress and rotor dynamics is carefully analyzed to obtain the optimal range of rotor diameter and core length. On this basis, the electromagnetic and power loss characteristics are analyzed in detail to obtain the final design scheme. Fluid-solid coupling model is used to calculate the temperature field of the HSPMM to verify the rationality of the scheme. The rotor thermal stress analysis considering the multi-layer and multi-angle winding of CFS is carried out to obtain the rotor models suitable for prototype and mass production, respectively. Finally, the prototypes are manufactured and tested to verify the reliability of the multiphysics design process.

关键词： high-speed permanent magnet machine multiphysics design carbon fiber sleeve thermal stress

Influence of Turbulence Schmidt Number on Exit Temperature Distribution of an Annular Gas Turbine Combustor using Flamelet Generated Manifold

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Journal of Thermal Science 2020年第1期29卷 58-68页

作者： WANG Weihao YANG Songlin gao chuang HUANG Weiguang Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Helan Turbines Co. LtdShanghai 201815China

The Reynolds analogy concept has been used in almost all turbulent reacting flow RANS(Reynoldsaveraged Navier–Stokes)simulations,where the turbulence scalar transfers in flow fields are calculated based on the modeled turbulence momentum *** concept,applied to a lean premixed combustion system,was assessed in this paper in terms of exit temperature *** of the isotropic assumption involved in this analogy,the prediction in some flow condition,such as jet cross flow mixing,would be *** this study,using Flamelet Generated Manifold as reaction model,some of the numerical results,obtained from an annular combustor configuration with the turbulent Schmidt number varying from 0.85 to 0.2,were presented and compared with a benchmark atmospheric test *** was found that the Schmidt numberσt in mean mass fraction f transport equation had significant effect on dilution air mixing *** mixing between dilution air and reaction products from the primary zone obviously improved asσt decreased on the combustor exit ***,the sensitivity ofσt in three turbulence models including Realizable k-ε,SST(Shear Stress Transport)and RSM(Reynolds Stress Model)has been compared as *** the calculation method of eddy viscosity was different within these three models,RSM was proved to be less sensitive than another two models and can guarantee the best prediction of mixing process *** the other hand,the results of dilution air mixing were almost independent of Schmidt number Sct in progress variable c transport *** study suggested that for accurate prediction of combustor exit temperature distribution in steady state reacting flow simulation,the turbulent Schmidt number in steady state simulation should be modified to cater to dilution air mixing process.

关键词： gas turbine combustor flamelet-generated manifold turbulent Schmidt Number Reynolds Stress Model Reynolds analogy

Atmospheric Test and Numerical Models Assessment of Annular Combustor on ZK2000 Gas Turbine

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Journal of Thermal Science 2018年第6期27卷 516-526页

作者： WANG Weihao HUANG Weiguang CAO Yun gao chuang Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China University of Chinese Academy of Sciences Beijing 100049 China ShanghaiTech University Shanghai 201210 China Helan Turbines Co. Ltd Shanghai 210815 China

ZK2000 is a newly developed 2 MW all radial gas turbine with an annular combustor. In this paper, the authors present the atmospheric test results of the combustor on test rig. Evaluation of several RANS turbulence models and reaction models were used in order to determine which model was the most appropriate combination for comparison with the test results. FGM with SST were selected because of the better agreement with test results in terms of combustor temperature rise, primary zone temperature, liner metal temperature, and NO_x emission predictions.

关键词： lean premixed annular combustor low emission atmospheric test flamelet generated manifold

A STUDY ON STRESS INTENSITY FACTORS AND SINGULAR STRESS FIELDS OF THREE-DIMENSIONAL INTERFACE CRACK

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Acta Mechanica Solida Sinica 1999年第1期12卷 43-50页

作者： Chen Mengcheng gao chuang Tang Renji Shanghai Jiao Tong Univ Dept Engn Mech Shanghai 200030 Peoples R China

By using the finite-part integral concepts and limit technique,the hypersingular inte- grodifferential equations ofthree-dimensional(3D)planar interface crack were obtained; then thedominant-part analysis of 2D hypersingular integral was further usedto investigate the stress fields near the crack front theoretically,and the accurate formulae were obtained for the singular stressfields and the complex stress intensity factors.

关键词： three-dimensional planar interface crack hypersingularintegrodifferential equation

Simulation of epitaxial growth on convex substrate using phase field crystal method

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Frontiers of Materials Science 2014年第2期8卷 185-192页

作者： Ying-Jun gao Li-Lin HUANG Qian-Qian DENG Kui LIN chuang-gao HUANG College of Physical Science and Engineering Guangxi University Nanning 530004 China Ministry Key Laboratory for Non-Ferrous Metal and Featured Materials Nanning 530004 China

Phase field crystal （PFC） model is employed to simulate the process of growth of epitaxial layer on plane-convex substrate with a lattice mismatch and a small inclination angle. The variation of the systematic free energy, the total atomic number of the epitaxial layer, and the effect of the curvature and the angle of the substrate are analyzed. The results show that when the surface of the substrate is plane, the free energy increases with the increase of the substrate inclination angle, and also the total atomic number of the epitaxial layer increases; while the surface of the substrate is convex, the free energy decreases with the increase of substrate angle and so also the total atomic number of the epitaxial layer decrease. This is the reason that the frontier of surface of epitaxial layer changes from the step bunching to the hill-and-valley facet structure with the increasing of the inclination angle of convex substrate. These results are in good agreement with the other method results.

关键词： heteroepitaxy phase field crystal (PFC) convex substrate atomic number

Phase field crystal simulation of grain boundary movement and dislocation reaction

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Frontiers of Materials Science 2014年第2期8卷 176-184页

作者： Ying-Jun gao Qian-Qian DENG Si-Long QUAN Wen-Quan ZHOU chuang-gao HUANG College of Physical Science and Engineering Guangxi University Nanning 530004 China Guangxi Key Laboratory for Non-Ferrous Metal and Featured Materials Nanning 530004 China

The phase field crystal （PFC） model is used to simulate the premelting dislocation movement of the symmetric tilt grain boundary （STGB） under strain action when the system temperature is at far from the melting point and close to the melting point, respectively. The results show a local premelting occurs surrounding the dislocations as the premelting temperature is approached to from below temperature. The premelting dislocations of the STGB can glide under strain action, and the premelting region is a companion for dislocation gliding. The process of STGB decay is very similar at the two high temperature conditions. As premelting presents, it diminishes the gliding resistance for the dislocations and leads to a faster movement of dislocations, and also brings about more energy reduction of the system during the decay process of STGB. In spite of applying strain to these premelting samples in whole decay processes of STGB, the premelting dislocation region does not obviously develop and extend. This indicates that the external strain action does not promote the premelting at the high temperature, and cannot induce more premelting dislocation, which can be owed to the premelting phase around the dislocation exhibit fluid-like properties and to the premelting dislocation easily gliding and relaxing the strain energy; this is in agreement with the results of experiments and molecular dynamics.

关键词： phase field crystal (PFC) model grain boundary (GB) premeltingdislocation strain

End-point dynamic control of basic oxygen furnace steelmaking based on improved unconstrained twin support vector regression

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Journal of Iron and Steel Research International 2020年第1期27卷 42-54页

作者： chuang gao Ming-gang Shen Xiao-ping Liu Nan-nan Zhao Mao-xiang Chu School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina School of Electronic and Information Engineering University of Science and Technology LiaoningAnshan 114051LiaoningChina School of Information and Electrical Engineering Shandong Jianzhu UniversityJinan 250101ShandongChina

In order to improve the end-point hit rate of basic oxygen furnace steelmaking,a novel dynamic control model was proposed based on an improved twin support vector regression *** controlled objects were the end-point carbon content and *** proposed control model was established by using the low carbon steel samples collected from a steel plant,which consists of two prediction models,a preprocess model,two regulation units,a controller and a basic oxygen *** test results of 100 heats show that the prediction models can achieve a double hit rate of 90%within the error bound of 0.005 wt.%C and 15℃.The preprocess model was used to predict an initial end-blow oxygen ***,the double hit rate of the carbon con tent and temperature only achieves 65%.Then,the oxygen volume and coolant additi ons were adjusted by the regulation units to improve the hit ***,the double hit rate after the regulation is reached up to 90%.The results indicate that the proposed dynamic control model is efficient to guide the real production for low carbon steel,and the modeling method is also suitable for the applications of other steel grades.

关键词： Steelmaking Basic oxygen furnace End-point control Twin support vector regression Wavelet transform

Spheroid construction strategies and application in 3D bioprinting

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Bio-Design and Manufacturing 2024年第5期7卷 800-818页

作者： Chunxiang Lu chuang gao Hao Qiao Yi Zhang Huazhen Liu Aoxiang Jin Yuanyuan Liu School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China School of Medicine Shanghai UniversityShanghai 200444China

Tissue engineering has been striving toward designing and producing natural and functional human *** are the fundamental building blocks of *** with traditional two-dimensional cultured cells,cell spheres are threedimensional(3D)structures that can naturally form complex cell–cell and cell–matrix *** structure is close to the natural environment of cells in living *** addition to being used in disease modeling and drug screening,spheroids have significant potential in tissue *** 3D bioprinting is an advanced biofabrication *** accurately deposits bioinks into predesigned 3D shapes to create complex tissue *** 3D bioprinting is efficient,the time required for cells to develop into complex tissue structures can be *** 3D bioprinting of spheroids significantly reduces the time required for their development into large tissues/organs during later cultivation stages by printing them with high cell *** spheroid fabrication and bioprinting technology should provide a new solution to many problems in regenerative *** paper systematically elaborates and analyzes the spheroid fabrication methods and 3D bioprinting strategies by introducing spheroids as building ***,we present the primary challenges faced by spheroid fabrication and 3D bioprinting with future requirements and some recommendations.

关键词： Spheroids Strategies 3D bioprinting Biofabrication

Spectroscopic signatures of edge states in hexagonal boron nitride

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Nano Research 2019年第7期12卷 1663-1667页

作者： chuang gao Lei Tao Yu-Yang Zhang Shixuan Du Sokrates T. Pantelides Juan Carlos Idrobo Wu Zhou Hong-Jun gao School of Physical Sciences and CAS Key Laboratory of Vacuum Physics University of Chinese Academy of SciencesBeijing 100049China Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science Vanderbilt UniversityNashvilleTN 37235USA CAS Centre for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100049China Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA

We use Z-contrast imaging and atomically resolved electron energy-loss spectroscopy on an aberration-corrected scanning transmission electron microscope to investigate the local electronic states of boron atoms at different edge structures in monolayer and bilayer *** find that edges with bonding unsaturated sp2 boron atoms have a unique spectroscopic signature with a prominent pre-peak at - 190.2 eV in the B K-edge fine ***-principles calculations reveal that the observed pre-peak arises from excitations to the in-plane lowest-energy empty sp2 boron dangling bonds at the B-terminated *** spectroscopic signature can serve as a fingerprint to explore new edge structures in h-BN.

关键词： h-BN edge structure spectroscopic signatures electron energy-loss near edge structure