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DENTING AND FAILURE OF LIQUID-FILLED TUBES UNDER LATERAL IMPACT

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Acta Mechanica Solida Sinica 2012年第6期25卷 609-615页

作者： Guoyun Lu jianping lei Zhijun Han Zhifang Liu Shanyuan Zhang Institute of Applied Mechanics Taiyuan University of Technology

In this paper, numerical simulation of impact cases of liquid-filled tube impacted by missiles is conducted with a commercial finite element code LS-DYNA, and the results obtained are compared with the experimental data to verify the validity of the numerical simulation model adopted. With the verified numerical method, the processes of dynamic response of a blunt indenter impacting an empty or liquid-filled three-span continuous tubular beam are studied when the parameter such ms the indenter＇s mass, liquid＇s density or impact velocity is varied and the other conditions are kept the same. The simulation results indicate that the criticM perforation energy and the deformation of the wall of the pipe are significantly influenced by the presence of the liquid and the pressure. The liquid filling the tube provides a ＇foundation＇ pressure to resist and localize the deformation, which may affect the perforation process and lead to a reduction of the ballistic limit. The simulation results also indicate that the increase of the fluid density filled in the tube will decrease the ballistic limit, but the fluid density must be in some scope. The relationship between the ballistic limit velocity of the tube and the mass of the impact missile is nonlinear in the Cartesian coordinate while it becomes linear through logarithmic transformation.

关键词： impact perforation fluid-structure interaction tube

Experimental study of rotating gliding arc discharge plasma-assisted combustion in an aero-engine combustion chamber

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Chinese Journal of Aeronautics 2019年第2期32卷 337-346页

作者： Liming HE Yi CHEN Jun DENG jianping lei Li FEI Pengfei LIU Science and Technology on Plasma Dynamics Laboratory Aeronautics and Astronautics Engineering CollegeAir Force Engineering University

The combustion chamber is the core component of an aero-engine, and affects its reliability and security operation, even the performance of the aircraft. In this work, a Plasma-Assisted Combustion(PAC) test platform was developed to validate the feasibility of using PAC actuators to enhance annular combustor performance. Two plans of PAC(rotating gliding arc discharge plasma) were designed, Assisted Combustion from Primary Holes(ACPH) and Assisted Combustion from Dilution Holes(ACDH). Comparative experiments and analysis between conventional combustion and PAC were conducted to study the effects of ACPH and ACDH on the performances including average outlet temperature, combustion efficiency, pattern factor under four different excessive air coefficients(0.8, 1, 2, and 4), and lean blowout performance at different inlet airflow velocities. Experimental results show that the combustion efficiency is improved after PAC compared with that in normal conditions, and the combustion efficiency of ACPH increases2.45%, 1.49%, 1.04%, and 0.47%, while it increases 2.75%, 1.67%, 1.36%, and 0.36% under ACDH conditions. The uniformity of the outlet temperature field and the lean blowout performance are improved after PAC. Especially for ACPH, the widening of the lean blowout limit is8.3%, 12.4%, 12.8%, and 25% respectively when the inlet velocity ranges from 60 m/s to120 m/s. These results offer new perspectives for using PAC devices to enhance aero-engine combustors' performances.

关键词： Aero-engine Assisted combustion actuator Combustion chambers Plasma-Assisted Combustion Rotating gliding arc discharge

The partitioning behavior of trace elements in subduction zones:Advances and prospects

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Science China Earth Sciences 2020年第12期63卷 1938-1951页

作者： Xiaolin Xiong Xingcheng Liu Li Li Jintuan Wang Wei Chen Mengfei Ruan Ting Xu Zhongxing Sun Fangfang Huang jianping Li&lei Zhang Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou510640China

The partitioning behavior of trace elements is of key importance for understanding the geochemical process and material cycle mechanism in subduction *** paper focuses on the advances and prospects on the studies of trace element partitioning in subduction zones from the following four aspects.(1)The properties of fluids derived from subducting slabs and their ability in element *** slab-derived solute-rich fluids and supercritical fluids are formed and what the roles and key control factors of these fluids are in transferring of elements(especially the high field strength elements)from slab to wedge are *** point out that the detailed investigations of supercritical fluids may provide a new perspective for the element migration mechanism,material cycle process,arc magma genesis and so on.(2)The behavior of transition elements during mantle wedge *** behavior of the first row transition elements(Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu,Zn)in the mantle partial melting process is compatible or incompatible,depending on residual mineral assemblage and physicochemical *** partitioning behavior of the elements such as Sc,Ti,Co,Ni and Zn whose valence states do not change in the melting process mainly depends on the residual mineral assemblage and temperature,whereas the partitioning behavior of the multivalent elements such as V and Fe is also the function of oxygen fugacity(fO_(2))in addition to mineral assemblage and ***,the partitioning behavior of transition elements has important applications in tracing lithologic inhomogeneity and fO_(2)of the mantle wedges.(3)The specificity of element partitioning behavior during arc magma *** has Dy/Yb partitioning behavior different from amphibole,and rutile has Nb/Ta partitioning behavior different from ***/Yb and Nb/Ta partitioning differences for these minerals enable to distinguish the specific evolution process of arc *** Dy/Yb and Nb/Ta generall

关键词： Subduction zone Supercritical fluid Transition elements Element partitioning Ore-forming elements

Application study on plasma ignition in aeroengine strut–cavity–injector integrated afterburner

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Plasma Science and Technology 2021年第10期23卷 186-196页

作者： Li Fei Bingbing Zhao Xiong Liu Liming He Jun Deng jianping lei Ziehen Zhao Zhiyu Zhao Air Force Engineering University Xi'an 710038People's Republic of China Aviation University of Air Force Changchun 130022People's Republic of China

To increase the thrust-weight ratio in next-generation military aeroengines,a new integrated afterburner was designed in this *** integrated structure of a combined strut–cavity–injector was applied to the *** improve ignition characteristics in the afterburner,a new method using a plasma jet igniter was developed and optimized for application in the integrated *** effects of traditional spark igniters and plasma jet igniters on ignition processes and ignition characteristics of afterburners were studied and compared with the proposed *** experimental results show that the strut–cavity–injector combination can achieve stable combustion,and plasma ignition can improve ignition *** with conventional spark ignition,plasma ignition reduced the ignition delay time by 67 ***,the ignition delay time was reduced by increasing the inlet velocity and reducing the excess air *** investigation provides an effective and feasible method to apply plasma ignition in aeroengine afterburners and has potential engineering applications.

关键词： integrated afterburner aeroengine plasma ignition ignition process ignition characteristics

Self-assembled DNA hydrogel as switchable material for aptamer-based fluorescent detection of protein

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Self-assembled DNA hydrogel as switchable material for aptam...

第八届全国化学生物学学术会议

作者： lei Zhang Lin Liu jianping lei Huangxian Ju State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing University

＜正＞The methodology based on target-responsive structural switching is powerful in bioanalysis with the controllability and *** this paper,an aptamer-functionalized DNA hydrogel was designed as specifically target-responsive switchable material for protein *** pure DNA hydrogel was constructed by using Y-shaped DNA and aptamer linker through DNA self-assembly without

关键词： DNA hydrogel target-responsive fluorescence thrombin

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中相微乳液的介电弛豫谱解析及弛豫机制研究

化学学报 2001年第9期59卷 1357-1362页

作者：赵孔双雷建平李缨北京师范大学化学系华南师范大学化学系

对由SDS、CTAB、正庚烷、正丁醇和盐水组成的中相微乳体系进行了介电测量,在不同盐度下低频段出现显著的介电弛豫现象,它给出了弛豫时间随盐度的变化关系.通过解析介电谱获得了体系内部结构和电性质等信息,几个介电模型和理论公式被用... 详细信息

对由SDS、CTAB、正庚烷、正丁醇和盐水组成的中相微乳体系进行了介电测量,在不同盐度下低频段出现显著的介电弛豫现象,它给出了弛豫时间随盐度的变化关系.通过解析介电谱获得了体系内部结构和电性质等信息,几个介电模型和理论公式被用来解释解析的结果.对弛豫时间的计算结果发现,该弛豫是由多种极化机制参与、界面极化为支配的动力学过程.介电解析和模型计算相互验证,结果暗示着体系盐度变化对中相微乳结构变化的影响和可能的转化机制.

关键词：中相微乳液介电谱弛豫时间界面极化结构弛豫机制

A MOLECULARLY IMPRINTED COPOLYMER DESIGNED FOR ENANTIOSELECTIVE RECOGNITION OF GLUTAMIC ACID

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A MOLECULARLY IMPRINTED COPOLYMER DESIGNED FOR ENANTIOSELECT...

第十二届北京分析测试学术报告会暨展览会(BCEIA 2007)

作者： Ruizhuo OUYANG jianping lei Yadong XUE Huangxian JU MOE Key Laboratory of Analytical Chemistry for Life Science Department of Chemistry Nanjing University

Natural receptors show high selectivity towards their respective target molecules and have attracted considerable interest for analytical purposes[1].However,their utilization as recognition elements often suffers from high cost and poor *** imprinted polymers(MIPs)overcome these problems[2].The electrosynthesized polymers of poly(dopamine)(PDA)and

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中南剧场空调通风系统设计

暖通空调 2009年第6期39卷 74-76,108页

作者：雷建平武汉市建筑设计院

介绍了该工程的地下水水文地质情况及水源热泵冷热源、消声减振、气流组织设计,分析了送风口型式对舞台温度梯度的影响。

关键词：剧场气流组织水源热泵空调通风

Study on High-intensity RCC and Aggregate Production Workmanship for Longtan Dam

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Study on High-intensity RCC and Aggregate Production Workman...