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Journal of Materials Science & Technology 2024年第4期171卷 129-138页

作者： Yuting Jin Jiaqi Li Mingxing Zhang borui zheng Dake Xu Tingyue Gu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China Department of Chemical and Biomolecular Engineering Institute for Corrosion and Multiphase TechnologyOhio UniversityAthens OH 45701USA

Microbes can cause or accelerate metal corrosion,leading to huge losses in corrosion damages each *** sulfurreducens is a representative electroactive bacterium in many soils,sediments,and wastew-ater *** has been confirmed to directly extract electrons from elemental ***,little is known about the effect of electron shuttles in *** corrosion on stainless *** this study,we report that exogenous flavins promote iron-to-microbe electron transfer,accelerating micro-bial *** caused 1.3 times deeper pits and increased electron uptake(with 2 times increase of i_(corr))from stainless steel when riboflavin was added to the culture ***-deficient mutant data suggest that *** utilizes riboflavin as a bound-cofactor in outer membrane c-type *** finding that,in the presence of microbes,riboflavin can substantially accelerate corrosion highlights the role of flavin redox cycling for enhanced iron-to-microbe electron transfer by *** and provides new insights in microbial corrosion.

关键词： Extracellular electron transfer Microbiological corrosion Geobacter sulfurreducens Outer membrane c-type cytochromes Exogenous flavins

Forebody asymmetric vortex control with extended dielectric barrier discharge plasma actuators

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Chinese Physics B 2020年第6期29卷 286-295页

作者： borui zheng Ming Xue Chang Ge School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Plasma control of forebody asymmetric vortices is mostly achieved by means of dielectric barrier discharge(DBD)plasma actuators. However, DBD actuators suffer from some disadvantages such as a weak induced body force, a singledirection induced jet, and an unclear control mechanism. We carry out wind tunnel experiments involving the forebody vortex control of a slender body at high angles of attack using an innovative extended DBD actuator, which has a stronger capacity to induce an electric wind than a DBD actuator. Through synchronous measurements of the pressure distribution and particle image velocimetry(PIV), the spatiotemporal evolution of the dynamic interactions between plasma-actuationinduced vortices and forebody asymmetric vortices is analyzed. The influence of plasma discharge on the boundary layer separation around a slender body and the spatial topological structures of asymmetric vortices are further surveyed, as the optimized actuation parameters. Extended DBD actuators are found to be more capable of controlling asymmetric vortices than DBD actuators, and a linear proportionality of the sectional lateral force versus the duty ratio is *** exists an optimal normalized reduced frequency( f+= 2π fpd/U∞= 2.39) for asymmetric vortex control under the present experimental conditions. The research results can provide technical guidance for the control and reuse of forebody asymmetric vortices.

关键词： plasma flow control dielectric barrier discharge forebody asymmetric vortex

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等离子体物流消杀设备及其智能化系统设计

机械设计 2024年第5期41卷 158-164页

作者：葛畅朱雨菁李若彬薛艳敏郑博睿余隋怀西安理工大学艺术与设计学院陕西西安710054 西安理工大学自动化与信息工程学院陕西西安710048 西北工业大学陕西省工业设计工程实验室陕西西安710072

为减小物流运输检疫工作的压力,设计了一种智能、高效且精准的物流消杀设备。因物流运输链中待消杀检测对象的品类繁杂,采用可在低温常压状态下高效杀菌的低温等离子体消毒技术,并在物流包裹消杀进程中设计一种垂直跌落装置,利用包裹自... 详细信息

为减小物流运输检疫工作的压力,设计了一种智能、高效且精准的物流消杀设备。因物流运输链中待消杀检测对象的品类繁杂,采用可在低温常压状态下高效杀菌的低温等离子体消毒技术,并在物流包裹消杀进程中设计一种垂直跌落装置,利用包裹自身重力进行翻转,减少消杀盲区。为提高消杀效率,搭建了可实时检测的智能化系统,实现消杀设备的自主控制,大幅度提高消杀效率,适用于冷链物流,为全产业链物流领域的病菌监测和防控提供了有效的解决方案。

关键词：产品设计物流消杀设备等离子体智能消毒系统

Minimizing airfoil drag at low angles of attack with DBD-based turbulent drag reduction methods

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Chinese Journal of Aeronautics 2023年第4期36卷 104-119页

作者： Zhi SU Haohua ZONG Hua LIANG Jun LI Like XIE Xuecheng LIU Weiliang KONG borui zheng Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi’an 710038China Institute of Aero-engine School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China The Green Aerotechnics Research Institute of Chongqing Jiaotong University Chongqing 404100China

Dielectric Barrier Discharge(DBD)based turbulent drag reduction methods are used to reduce the total drag on a NACA 0012 airfoil at low angels of *** interaction of DBD with turbulent boundary layer was investigated,based on which the drag reduction experiments were *** results show that unidirectional steady discharge is more effective than oscillating discharge in terms of drag reduction,while steady impinging discharge fails to finish the mission(*** increase).In the best scenario,a maximum relative drag reduction as high as 64%is achieved at the freestream velocity of 5 m/s,and a drag reduction of 13.7%keeps existing at the freestream velocity of 20 m/*** unidirectional discharge,the jet velocity ratio and the dimensionless actuator spacing are the two key parameters affecting the *** drag reduction magnitude varies inversely with the dimensionless spacing,and a threshold value of the dimensionless actuator spac-ing of 540(approximately five times of the low-speed streak spacing)exists,above which the drag *** the jet velocity ratio smaller than 0.05,marginal drag variation is *** con-trast,when the jet velocity ratio larger than 0.05,the experimental data bifurcates,one into the drag increase zone and the other into the drag reduction zone,depending on the value of dimensionless actuator *** both zones,the drag variation magnitude increases with the jet velocity *** total drag reduction can be divided into the reduction in pressure drag and turbulent friction drag,as well as the increase in friction drag brought by transition *** reduction in tur-bulent friction drag plays an important role in the total drag reduction.

关键词： Dielectric barrier discharge Dimensionless scaling Plasma actuator Turbulent friction drag Wake

Reduction of turbulent boundary layer drag through dielectric-barrier-discharge plasma actuation based on the Spalding formula

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Plasma Science and Technology 2019年第4期21卷 107-114页

作者： Bin WU Chao GAO Feng LIU Ming XUE Yushuai WANG borui zheng Northwestern Polytechnical University Xi'an 710072.People's Republic of China University of California IrvineCA.92697-3975United States of America Xi'an University of Technology Xi'an 710048.People's Republic of China

It is a very difficult task to develop a method of reducing turbulent boundary layer ***,in recent years,plasma flow control technology has demonstrated huge potential in friction drag *** further investigate this issue,a smooth plate model was designed as a testing object arranged with a bidirectional dielectric-barrier-discharge(DBD)plasma *** addition,measurement of skin friction drag was achieved by applying hot wire anemometry to obtain the velocity distribution of the turbulent boundary layer.A method of quantifying the friction drag effect was adopted based on the Spalding formula fitted with the experiment *** plasma actuation was conducted,a velocity defect occurred at the two measuring positions,compared with the no plasma control condition;this means that the DBD plasma actuation could reduce the drag successfully in the downstream of the ***,drag reduction caused by backward actuation was slightly more efficient than that caused by forward *** an increasing distance from plasma actuation,the drag-reduction effect could become *** results also show that the improvement of drag-reduction efficiency using a DBD plasma actuator can achieve about 8.78%in the local region of the experimental flat model.

关键词： DBD plasma actuator flow control Spalding formula drag reduction turbulent boundary layer

Flow Control over a Conical Forebody by Duty-Cycle Actuations

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Plasma Science and Technology 2012年第1期14卷 58-63页

作者： zheng borui GAO Chao LI Yibin LIU Feng LUO Shijun Northwestern Polytechnical University Xi’an 710072China University of California IrvineCA 92697-3975USA

Duty-cycle modulation alternately blowing from two opposite-facing plasma actu- ators on the leeward surface near the apex of a cone with a 10° semi-apex angle is adopted to control mean lateral force and moment, and the flow control mechanisms are presented. Pressure distributions over the forebody of the cone are measured by steady pressure tappings. The experiments are performed in a 3.0×1.6 m open-circuit wind tunnel at a wind speed of 20 m/s, a 45° angle of attack and a Reynolds number of 2×10^5, based on the diameter of the base of the cone. Almost linearly proportional control of the lateral forces and moments over a slender conical forebody at a high angle of attack has been demonstrated by employing a pair of single dielectric barrier discharge plasma actuators near the apex of the cone, combined with a duty-cycle tech- nique. The pressure distribution measurements indicate that the hi-stable vortex pattern appears to be shifted in the opposite direction when the port or starboard actuator is activated, while the other is kept off during the test. It is shown that the reduced pulse-repetition frequency based on the local diameter at the plasma actuator equal to one yields the highest effectiveness among the cases considered.

关键词： conical forebody plasma actuator flow control duty cycle

Electrical and aerodynamic characteristics of sliding discharge based on a microsecond pulsed plasma supply

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Plasma Science and Technology 2022年第11期24卷 37-46页

作者： Taifei ZHAO Qian ZHANG borui zheng Yuanpeng LIU Yuanzhong JIN Quanlong CHEN School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China The Green Aerotechnics Research Institute of Chongqing Jiaotong University Chongqing 401120People’s Republic of China

Plasma flow control technology has broad prospects for *** with conventional dielectric barrier discharge plasma actuators(DBD-PA),the sliding discharge plasma actuator(SD-PA)has the advantages of a large discharge area and a deflectable induced *** achieve the basic performance requirements of light weight,low cost,and high reliability required for UAV(Unmanned Aerial Vehicle)plasma flight experiments,this work designed a microsecond pulse plasma supply that can be used for sliding discharge plasma *** this study,the topology of the primary circuit of the microsecond pulse supply is determined,the waveform of the output terminal of the microsecond pulse plasma supply is detected using the Simulink simulation platform,and the design of the actuation voltage,the pulse frequency modulation function and the construction of the hardware circuit are *** electrical diagnosis and flow field analysis,the actuation characteristics and flow characteristics of sliding discharge plasma under microsecond pulse actuation are studied,the optimal electrical actuation parameters and flow field characteristics are described.

关键词： plasma flow control microsecond pulse plasma supply sliding discharge plasma

Turbulent drag reduction by spanwise slot blowing pulsed plasma actuation

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Plasma Science and Technology 2022年第11期24卷 26-36页

作者： borui zheng Yuanzhong JIN Minghao YU Yueqiang LI Bin WU Quanlong CHEN School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China Department of Aeronautics and Astronautics Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Green Aerotechnics Research Institute of Chongqing Jiaotong University Chongqing 401120People’s Republic of China

This work studies the turbulent drag reduction(TDR)effect of a flat plate model using a spanwise slot blowing pulsed plasma actuator(SBP-PA).Wind tunnel experiments are carried out under a Reynolds number of 1.445×10^(4).Using a hot-wire anemometer and an electrical data acquisition system,the influences of millisecond pulsed plasma actuation with different burst frequencies and duty cycles on the microscale coherent structures near the wall of the turbulent boundary layer(TBL)are *** experimental results show that the SBP-PA can effectively reduce the frictional drag of the *** the duty cycle exceeds 30%,the TDR rate is greater than 11%,and the optimal drag reduction rate of 13.69%is obtained at a duty cycle of 50%.Furthermore,optimizing the electrical parameters reveals that increasing the burst frequency significantly reduces the velocity distribution in the logarithmic region of the *** the normalized burst frequency reaches f+=2πf_(p)d/U_(∞)=7.196,the optimal TDR effectiveness is 16.97%,indicating a resonance phenomenon between the pulsed plasma actuation and the microscale coherent structures near the ***,reasonably selecting the electrical parameters of the plasma actuator is expected to significantly improve the TDR effect.

关键词： turbulent boundary layer control plasma flow control hot-wire turbulent frictional drag turbulent drag reduction

Investigation of the interaction between NS-DBD plasma-induced vortexes and separated flow over a swept wing

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Plasma Science and Technology 2023年第1期25卷 88-99页

作者：刘备梁华郑博睿 Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi'an 710038People's Republic of China The Green Aerotechnics Research Institute of Chongqing Jiaotong University Chongqing 401120People's Republic of China

The effect of nanosecond pulsed dielectric barrier discharge(NS-DBD) plasma flow separation control is closely related to the actuation frequency,because it involves the interaction between plasma-induced vortexes and separated *** order to study the mechanism of NS-DBD plasma flow separation control over a swept wing,especially the influence of the actuation frequency,at first,experimental studies of the actuation frequencies at 100 Hz are conducted to validate the numerical simulation ***,numerical studies of different actuation frequencies which are 50 Hz,100 Hz,160 Hz,200 Hz,500 Hz,and 1000 Hz,respectively are *** interaction between the plasma-induced vortexes and the separated flow is *** show that there is a range of the actuation frequency which includes the frequency(160 Hz) calculated by the average aerodynamic chord length to make the control effect good,but when the actuation frequencies are too low(50 Hz) or too high(1000 Hz),the control effect will get *** former is because plasmainduced vortexes disappear in a period within an actuation cycle;the latter is because plasma-induced vortexes cannot develop completely,resulting in a weak vortex intensity.

关键词： plasma-induced vortex flow separation control NS-DBD LES

Exercise preconditioning alleviates ischemia-induced memory deficits by increasing circulating adiponectin

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Neural Regeneration Research 2025年第5期20卷 1445-1454页

作者： Meifeng zheng borui Zhang Sonata S Y Yau Kwok-Fai So Li Zhang Haining Ou Department of Rehabilitation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key Laboratory of CNS Regeneration(Ministry of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina State Key Laboratory of Brain and Cognitive Science Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercise and Brain Science School of PsychologyShanghai University of SportShanghaiChina Neuroscience and Neurorehabilitation Institute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral ischemia is a major health risk that requires preventive approaches in addition to drug *** exercise enhances neurogenesis and synaptogenesis,and has been widely used for functional rehabilitation after *** this study,we determined whether exercise training before disease onset can alleviate the severity of cerebral *** also examined the role of exercise-induced circulating factors in these *** mice were subjected to 14 days of treadmill exercise training before surgery for middle cerebral artery *** found that this exercise pre-conditioning strategy effectively attenuated brain infarct area,inhibited gliogenesis,protected synaptic proteins,and improved novel object and spatial memory *** analysis showed that circulating adiponectin plays a critical role in these preventive effects of *** activation of adiponectin receptors by Adipo Ron mimicked the effects of exercise,while inhibiting receptor activation abolished the exercise *** summary,our results suggest a crucial role of circulating adiponectin in the effects of exercise pre-conditioning in protecting against cerebral ischemia and supporting the health benefits of exercise.

关键词： adiponectin cerebral ischemia exercise pre-conditioning hippocampus memory function middle cerebral artery occlusion prefrontal cortex synaptic proteins treadmill exercise