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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第5期35卷 778-788页

作者： Zhao Liqing sun jianhong School of Marine Sciences Nanjing University of Information Science & Technology College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

A dual-jet consisting of a wall jet and an offset jet has been numerically simulated using lattice Boltzmann method to examine the effects of jet spacing between two jet centerlines,defined as *** Reynolds number based on jet-exit-width dis set to be Re = 56 and the jet spacing is set to be less than or equal 10 times the *** results reveal that the flow field displays periodic vortex shedding when the jet spacing is in the range of 9≤s/d ≤ 10,while it remains steady with two counter-rotating vortices in the converging region when s/d ≤ *** s/d = 9,the power spectral analyses indicate that the vortex shedding phenomenon has specific *** significant oscillation stresses induced by the periodic components of velocities are found to mainly exist in the inner shear layer regions,implying stronger momentum transfer occuring in these regions.

关键词： dual-jet low-Reynolds number lattice Boltzmann method vortex shedding

Flow Characteristics of Flapping Motion of a Plane Water Jet Impinging onto Free Surface

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Advances in Applied Mathematics and Mechanics 2013年第6期5卷 846-856页

作者： Liqing Zhao jianhong sun College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics29 Yudao StreetNanjing 210016JiangsuChina

A submerged turbulent plane jet in shallow water impinging vertically onto the free surface will produce a large-scale flapping motion when the jet exit velocity is larger than a critical *** flapping phenomenon is verified in this paper through a large eddy simulation where the free surface is modeled by volume of fluid *** quantitative results for flapping jet are found to be in good agreement with available experimental data in terms of mean velocity,flapping-induced velocity and turbulence *** show that the flapping motion is a new flow pattern with characteristic flapping frequency for submerged turbulent plane jets,the mean centerline velocity decay is considerably faster than that of the stable impinging jet without flapping motion,and the flapping-induced velocities are as important as the turbulent fluctuations.

关键词： Turbulent plane jet flapping motion volume of fluid large eddy simulation

Experimental and numerical study on the flapping motion of submerged turbulent plane jet

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Science China(Technological Sciences) 2013年第10期56卷 2391-2397页

作者： sun jianhong ZHAO LiQing HSU ChinTsau College of Aerospace Engineering Nanjing University of Aeronautics & Astronautics Department of Mechanical Engineering Hong Kong University of Science & Technology

A submerged,vertical turbulent plane water jet impinging onto a free surface will be self-excited into a flapping oscillation when the jet velocity,leaving the jet orifice,exceeds a critical *** flapping phenomenon was verified simultaneously in this paper by laser Doppler velocimeter measurement and numerical analyses with volume of fluid approach coupled with a large eddy simulation turbulent *** general agreement of mean velocities between numerical predictions and experimental results in self-similar region is good for two cases:Reynolds numbers 2090 and 2970,which correspond to the stable impinging jet and flapping *** show that the flapping jet is a new flow pattern for submerged turbulent plane jets with characteristic flapping frequency,and that the decay of the mean velocity along the jet centerline is considerably faster than that of the stable impinging state.

关键词： turbulent plane jet flapping motion laser Doppler velocimeter volume of fluid large eddy simulation

Large-eddy simulation of the compressible flow past a tabbed cylinder

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Chinese Science Bulletin 2012年第24期57卷 3203-3210页

作者： XU ChangYue ZHAO LiQing sun jianhong College of Aerospace Engineering Nanjing University of Aeronautics&Astronautics Nanjing 210016China

The compressible flow past a tabbed cylinder has been studied numerically using large-eddy simulation for a free-stream Mach number M∞=0.75 and a Reynolds number based on the diameter Re=2×105. Because of the passive control of the flow past a tabbed cylinder, the mean drag coefficient of tabbed cylinder is less than that of a corresponding circular cylinder with a drag reduction up to 33%. The fluctuating lift coefficient is greatly suppressed to be nearly zero. Drag reduction due to the shearing process prevails over that due to the compressing process in this flow. Through investigating the mechanisms relevant to passive control of the tab, it is found that suppression of the shear layer instability can lead to a higher-base-pressure distribution, which can reasonably be associated with drag reduction and suppression of the lift fluctuations. The analysis of convective Mach number and self-sustained oscillations phenomenon inside the shear layers indicates that both the compressible effect and high-frequency forcing result in suppression of the shear layer instability of tabbed cylinder.

关键词：可压缩流动大涡模拟标签气缸被动控制剪切层数值研究阻力系数

Flow Characteristics of Double-Cruciform Parachute at Inflating and Inflated Conditions

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第6期35卷 992-999页

作者： Fang Ming sun jianhong Zhang Tong Hou Bin Zhang Yantai Key Laboratory of Aircraft Environment Control and Life Support of MIIT College of Aerospace EngineeringNanjing University of Aeronautics and Astronautics

The fluid-structure interaction (FSI) between the canopy and flow field on the inflating and inflated conditions is investigated based on the arbitrary Lagrange-Euler (ALE) method,in both a single-and double-cruciform parachute *** projection area of canopy is calculated in the inflation *** flow field characteristics and the interaction between canopies are *** showed that,with free stream velocity of 50m/s,overinflation phenomenon would not occur during the inflation process of the double-cruciform-parachute system,because the collision and extrusion of the two canopies during inflation obstructed the oscillation of the inner ***,compared with the single-cruciform parachute,the vortex motion in the wake of double-cruciform-parachute is more *** the double-cruciform parachute system oscillated at a velocity of 50 m/s with an angle of less than 6.8°.By comparison,the oscillation angle of the single-cruciform parachute was within 3.5° at the velocity of 50m/*** results are consistent with those of the wind tunnel test.

关键词： process of inflation arbitrary Lagrange-Euler(ALE) Lamb vector divergence cruciform parachute

A Novel Secret Sharing Scheme Based on Minimal Linear Codes

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Wuhan University Journal of Natural Sciences 2013年第5期18卷 407-412页

作者： LI Zhihui sun jianhong LI Jing College of Mathematics and Information Science Shaanxi Normal University

In this paper, we propose a novel space efficient secret sharing scheme on the basis of minimal linear codes, which satisfies the definition of a computationally efficient secret sharing scheme. In the scheme, we partition the underlying minimal linear code into disjoint classes, establishing a one-to-one correspondence between the minimal authorized subsets of participants and the representative codewords of all different classes. Each participant, with only one short share transmitted through a public channel, can share a large secret. Therefore, the proposed scheme can distribute a large secret in practical applications such as secure information dispersal in sensor networks and secure multiparty computation.

关键词： secret sharing scheme computationally efficient secret sharing minimal linear code access structure short share

A Novel Aircraft Air Conditioning System with a Sterilization Unit by Ultra-High-Temperature Air Stream

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第4期37卷 646-654页

作者： sun Zhi sun jianhong CHEN Siyu Key Laboratory of Aircraft Environment Control and Life Support MIITNanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China College of Civil Aviation/College of Flight Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China

An aircraft cabin is a narrow,closed-space *** keep the air quality in cabin healthy for passengers,especially during an epidemic such as SARS-CoV-2(or 2019-nCoV)in 2020,a novel aircraft air conditioning system,called the ultra-high-temperature instantaneous sterilization air conditioning system(UHTACS),is *** on the proposed system,a simulation of the UHT-ACS is analysed in various flight *** the UHT-ACS,the mixing air temperature of return and bleed air can reach temperature up to 148.8°C,which is high enough to kill bacilli and viruses in 2一8 *** supply air temperature of the UHT-ACS in a mixing cavity is about 12 C in cooling mode both on the ground and in the *** supply air temperature is about 42 C in heating *** with the air conditioning systems(ACS)of traditional aircraft the supply air temperatures of the UHT-ACS in the mixing cavity are in good agreement with those of a traditional ACS with 60%fresh air and 40%return *** the air temperature at the turbine outlet of the UHT-ACS is higher than that of a traditional ACS which will help to reduce the risk of icing at the *** the UHT-ACS can operate normally in various flight states.

关键词： air conditioning system(ACS) ultra-high-temperature instantaneous sterilization ultra-hightemperature instantaneous sterilization air conditioning system(UHT-ACS) return air 2019-nCoV

Baculovirus Surface Display of Zika Virus Envelope Protein Protects against Virus Challenge in Mouse Model

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Virologica Sinica 2020年第5期35卷 637-650页

作者： Dan Luo Yuanjiu Miao Xianliang Ke Zhongyuan Tan Chun Hu Penghui Li Ting Wang Yuan Zhang jianhong sun Yan Liu Hanzhong Wang Zhenhua Zheng CAS Key Laboratory of Special Pathogens and Biosafety Center for Emerging Infectious DiseasesWuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China Computer Center of Tongji Hospital Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesWuhan 430071China

Zika virus(ZIKV)is emerging as a significant pathogen worldwide and may cause severe neurological disorders such as fetal microcephaly and Guillain-Barre *** drug or listed vaccines are currently available for preventing ZIKV *** a major target of neutralizing,ZIKV envelop(E)protein usually used for vaccine ***,the immunogenicity of ZIKV envelop(E)protein expressed by baculovirus display system has never been *** this study,we reported a new strategy for surface display of ZIKV E protein by a recombinant baculovirus vector derived from Autographa californica multiple nuclear polyhedrosis virus(AcMNPV)and assessed its immunogenicity in *** produced recombinant fusion ZIKV E protein linked with signal peptide(SP)and transmembrane domain(TM)of AcMNPV *** results showed that the recombinant protein was easy to produce by baculovirus display ***/c mice immunized with this recombinant E protein developed ZIKV specific serum *** anti-E protein sera from the mice were able to effectively neutralize ZIKV in *** importantly,AG6(IFN-a/b and IFN-c receptor deficient)mice immunized with recombinant E protein were protected against lethal ZIKV ***,thesefindings demonstrated that the recombinant E protein displayed by baculovirus can be conveniently prepared and displayed good immunogenicity in immunized *** is a promising practical approach for prompting the development of vaccine and related immunology research.

关键词： Zika virus(ZIKV) Envelope protein Baculovirus Immunogenicity Neutralizing antibody Viral challenge

A Review on Effects of Personalized Ventilation Systems on Air Quality and Thermal Comfort in Aircraft Cabin Mini-Environments

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Transactions of Nanjing University of Aeronautics and Astronautics 2022年第2期39卷 121-142页

作者： sun jianhong CHANFIOU Ahmed Mboreha WANG Yan sun Zhi Key Laboratory of Aircraft Environment Control and Life Support MIITNanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China

This study conducts an evaluation of air quality,dispersion of airborne expiratory pollutants and thermal comfort in aircraft cabin mini-environments using a critical examination of significant studies conducted over the last20 *** research methods employed in these studies are also explained in *** on the current literature,standard procedures for airplane personal ventilation and air quality investigations are defined for each study *** study gaps are examined,and prospective study subjects for various research approaches are suggested.

关键词： personal ventilation system computational fluid dynamics(CFD) mini-environment aircraft thermal comfort

Recovery of a Far-Eastern Strain of Tick-Borne Encephalitis Virus with a Full-Length Infectious cDNA Clone

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Virologica Sinica 2021年第6期36卷 1375-1386页

作者： Penghui Li Chen Yao Ting Wang Tong Wu Wenfu Yi Yue Zheng Yuanjiu Miao jianhong sun Zhongyuan Tan Yan Liu Xiaowei Zhang Hanzhong Wang Zhenhua Zheng CAS Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of VirologyCenter for Biosafety MegaScienceChinese Academy of SciencesWuhan 430071China College of Life Sciences and Food Engineering Hebei University of EngineeringHandan 056038China

Tick-borne encephalitis virus(TBEV) is a pathogenic virus known to cause central nervous system(CNS) diseases in humans, and has become an increasing public health threat nowadays. The rates of TBEV infection in the endemic countries are increasing. However, there is no effective antiviral against the disease. This underscores the urgent need for tools to study the emergence and pathogenesis of TBEV and to accelerate the development of vaccines and antivirals. In this study, we reported an infectious c DNA clone of TBEV that was isolated in China(the WH2012 strain). A beta-globin intron was inserted in the coding region of nonstructural protein 1(NS1) gene to improve the stability of viral genome in bacteria. In mammalian cells, the inserted intron was excised and spliced precisely, which did not lead to the generation of inserted mutants. High titers of infectious progeny viruses were generated after the transfection of the infectious clone. The cDNA-derived TBEV replicated efficiently, and caused typical cytopathic effect(CPE) and plaques in BHK-21 cells. In addition, the CPE and growth curve of cDNA-derived virus were similar to that of its parental isolate in cells. Together, we have constructed the first infectious TBEV cDNA clone in China, and the clone can be used to investigate the genetic determinants of TBEV virulence and disease pathogenesis, and to develop countermeasures against the virus.

关键词： Tick-borne encephalitis virus(TBEV) Infectious cDNA clone Intron Virus replication