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| 1 | Numerical investigation of flow separation behavior in an over-expanded annular conical aerospike nozzle显示文摘A three-part numerical investigation has been conducted in order to identify the flow separation behavior––the progression of the shock structure, the flow separation pattern with an increase in the nozzle pressure ratio(NPR), the prediction of the separation data on the nozzle wall,and the influence of the gas density effect on the flow separation behavior are included.The computational results reveal that the annular conical aerospike nozzle is dominated by shock/shock and shock/boundary layer interactions at all calculated NPRs, and the shock physics and associated flow separation behavior are quite complex.An abnormal flow separation behavior as well as a transition process from no flow separation at highly over-expanded conditions to a restricted shock separation and finally to a free shock separation even at the deign condition can be observed.The complex shock physics has further influence on the separation data on both the spike and cowl walls, and separation criteria suggested by literatures developed from separation data in conical or bell-type rocket nozzles fail at the prediction of flow separation behavior in the present asymmetric supersonic nozzle.Correlation of flow separation with the gas density is distinct for highly overexpanded conditions.Decreasing the gas density or reducing mass flow results in a smaller adverse pressure gradient across the separation shock or a weaker shock system, and this is strongly coupled with the flow separation behavior.The computational results agree well with the experimental data in both shock physics and static wall pressure distribution at the specific NPRs, indicating that the computational methodology here is advisable to accurately predict the flow physics. | He Miaosheng Qin Lizi Liu Yu | 2015 | Chinese Journal of Aeronautics2015，28，4： | 3 |
| 2 | Effects of high magnetic field on the evolutions of constituent phases in 7085 aluminum alloy during homogenization显示文摘 | Lizi He Xiehua Li Pei Zhu Yiheng Cao Yaping Guo Jianzhong Cui | 2012 | Materials Characterization2012，，： | 2 |
| 3 | Radical recombination in a hydrocarbon-fueled scramjet nozzle显示文摘To reveal the radical recombination process in the scramjet nozzle flow and study the effects of various factors of the recombination, weighted essentially non-oscillatory(WENO)schemes are applied to solve the decoupled two-dimensional Euler equations with chemical reactions to simulate the hydrocarbon-fueled scramjet nozzle flow. The accuracy of the numerical method is verified with the measurements obtained by a shock tunnel experiment. The overall model length is nearly 0.5 m, with inlet static temperatures ranging from 2000 K to 3000 K, inlet static pressures ranging from 75 k Pa to 175 k Pa, and inlet Mach numbers of 2.0 ± 0.4 are involved.The fraction Damkohler number is defined as functions of static temperature and pressure to analyze the radical recombination progresses. Preliminary results indicate that the energy releasing process depends on different chemical reaction processes and species group contributions. In hydrocarbon-fueled scramjet nozzle flow, reactions with H have the greatest contribution during the chemical equilibrium shift. The contrast and analysis of the simulation results show that the radical recombination processes influenced by inflow conditions and nozzle scales are consistent with Damkohler numbers and potential dissociation energy release. The increase of inlet static temperature improves both of them, thus making the chemical non-equilibrium effects on the nozzle performance more significant. While the increase of inlet static pressure improves the former one and reduces the latter, it exerts little influence on the chemical non-equilibrium effects. | Zhang Xiaoyuan Qin Lizi Chen Hong He Xuzhao Liu Yu | 2014 | Chinese Journal of Aeronautics2014，27，6： | 2 |
| 4 | Effects of high magnetic field on the evolutions of constituent phases in 7085 aluminum alloy during homogenization显示文摘 | Lizi He Xiehua Li Pei Zhu Yiheng Cao Yaping Guo Jianzhong Cui | 2012 | Materials Characterization2012，，： | 1 |
| 5 | Relationship between micro-porosity and tensile properties of 6063 alloy显示文摘The micro-porosity is usually present in the as-cast microstructure,which decreases the tensile strength and ductility and therefore limit the application of cast aluminum parts.Although much work has been done to investigate the effects of various casting parameters on the formation of porosity in various aluminum alloys,up to now,little information has been available for the relationship between micro-porosity and tensile properties of 6063 alloy.In this study,the influences of size and area fraction of micro-porosity on the tensile properties and fracture behavior of 6063 aluminum alloy were investigated by means of tensile testing,optical microscopy(OM),and scanning electron microscopy(SEM).The tensile tests were conducted in air at 100 ℃,200 ℃ and 300 ℃,respectively.Results show that the large micro-porosity with sizes between 100 μm and 800 μm located at the center and top of the ingot,while the small micro-porosity with size between 2 μm and 60 μm distributed at the edge and bottom of the ingot.The area fraction of micro-porosity at the center of the ingot is much bigger than that at the edge of the ingot.When tested at 100 ℃,with the decrease in the area fraction of micro-porosity from the top of the ingot to the bottom of the ingot,the ultimate tensile strength,yield strength and the elongation are increased from 82 to 99 MPa,32 to 66 MPa and 7% to 11%,respectively.When the temperature is no more than 200 ℃,the strain hardening exponent decreases with an increase in the area fraction of micro-porosity;while the deviation disappears when the temperature reaches 300 ℃.The fracture mode of the alloy is greatly influenced by the size and area fraction of the micro-porosity. | Li Xiehua He Lizi Zhu Pei Cao Yiheng Guo Yaping Cui Jianzhong | 2013 | China Foundry2013，10，1： | 1 |
| 6 | Effects of thermomechanical treatment on the mechanical properties and microstructures of 6013 alloy显示文摘 | Lizi He Haitao Zhang Jianzhong Cui | 2009 | Journal of Wuhan University of Technology - Mater Sci Ed2009，，2： | 1 |
| 7 | Effects of Pre-Ageing Treatment on Subsequent Artificial Ageing Characteristics of an Al-1.01Mg-0.68Si-1.78Cu Alloy显示文摘The influences of pre-ageing temperature and natural ageing time on subsequent artificial age hardening behavior and precipitation sequence of new type Al-1.01Mg-0.68Si-1.78Cu alloy were investigated by hardness test, differential scanning calorimetry (DSC) test and transmission electronic microscopy (TEM) observations. When pre-ageing temperature is 20℃ (natural ageing), the peak hardness of subsequent artificial aged alloy is lower than that of T6 treated alloy (negative effect), while a positive effect appears when pre-ageing temperature is above 80℃. The size of needlelike β-precipitate in subsequent artificial aged alloy is much coarser when pre-ageing temperature is 20℃, which causes a decrease in peak-hardness. The positive effect occurs again when natural ageing time is longer than 3 weeks. There are seven exothermic peaks in DSC curve of as-quenched alloy, while the number and height of exothermic peak decrease with increasing pre-ageing temperature and natural ageing time. | Lizi He , Haitao Zhang and Jianzhong Cui Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China | 2010 | Journal of Materials Science & Technology2010，26，2： | 1 |
| 8 | Numerical Simulation of Stress Field in Physical Tempering Process of Flat Soda Lime Silica Glass显示文摘Based on the analysis of different theory for glass tempering process,the“structural theory”with stress relaxation and structural relaxation effects was selected to investigate the tempering of flat glass quantificationally.The geometrical model with small size and non-homogeneous mesh were considered to build the finite element models according to the characteristics of stress field.The tempering process of flat glass with12 mm thickness was calculated with the verified finite element model.The transient and permanent stress of the central area,edge and corner end of the flat glass are obtained and analyzed.From the calculation results of basic case,the transient tensile stress at the upper surface of the central area,the center point of edge,the edge of edge,the edge of corner were 14.30,18.94,40.76 and 34.75 MPa,respectively.The transient tensile stress at these points were dangerous to promote the glass to break during the tempering.In addition,the point at the diagonal line of symmetry plane in the thickness direction,which is 14 mm from corner,has the maximum permanent tensile stress about 70.01 MPa in the flat glass after tempering.Thus,it is indicated that the corner is the weakest region in the tempered glass. | 刘超英 HE Dongsheng OU Yingchun HE Feng HAO Lizi XU Shaokun MA Juanrong | 2023 | Journal of Wuhan University of Technology(Materials Science)2023，38，1： | 0 |
| 9 | Proteomic Analysis of Sea Cucumber (Holothuria leucospilota) from the South China Sea显示文摘[Objectives]Proteomics methods were used to analyze the total proteome of Holothuria leucospilota in the South China Sea,so as to provide a theoretical basis for elucidating the medicinal material basis of sea cucumber proteins and peptides.[Methods]H.leucospilota was collected from the South China Sea.Label-free proteomics methods were used to detect the protein profile of enzymatically hydrolyzed H.leucospilota total protein,and identify sea cucumber protein and peptide sequences,and gene ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)bioinformatics analysis software were used to analyze significantly enriched proteins.The String database was used to construct a protein-protein interaction network of significantly enriched H.leucospilota proteins(PPI network).[Results]Proteomics identified 1200 sea cucumber proteins and 2967 peptides.GO analysis and KEGG analysis showed that the four significantly-enriched sea cucumber proteins hsc70,COX,CYTB and rbbp4 participated in 8 metabolic pathways,and COX1 and CYTB among them were significantly related to cardiac muscle contraction,oxidative phosphorylation and metabolic pathways.The PPI network analysis showed that the 13 significantly-enriched sea cucumber proteins had close protein-protein interaction relationships.[Conclusions]This study used proteomics to conduct preliminary identification and research on the proteins and peptides of H.leucospilota,providing a scientific basis for the application of H.leucospilota proteins and peptides in the fields of functional health food and drug research and development. | Le WANG Lizi SHEN Jiao HE Zuliang WU Chen CHEN Bingmiao GAO | 2021 | Agricultural Biotechnology2021，10，6： | 0 |
| 10 | Effect of artificial aging on the deformation behavior of an Al-1.01Mg-0.68Si-1.78Cu alloy显示文摘The influences of artificial aging on the microstructures and mechanical properties of an Al-1.01Mg-0.68Si-1.78Cu alloy were investigated. The detailed fracture surfaces, precipitates, and dislocation structures were also examined through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the tensile strengths exhibit two peak values and reach saturated values with increasing aging time, while the elongation decreases sharply to the minimum value and changes slightly later. The deformation and fracture behaviors are also closely related to the aging conditions. | HE Lizi CHEN Yanbo ZHANG Haitao CUI Jianzhong | 2008 | Rare Metals2008，27，5： | 0 |
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