检索结果-南通市图书馆

Experimental Analysis of A Cooling System for Wind-Driven Generator Stator

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2016年第2期33卷 180-186页

作者： Qian Xiaohui jiang yanlong Cheng Danfeng Liu Juan College of Aerospace Engineering Nanjing University of Aeronautics & Astronautics Shanghai Aircraft Design & Research Institute Commercial Aircraft Corporation of ChinaLtd

A novel cooling system with cooling channels is proposed for the stator of 3MW wind-driven *** experimental platform is built to investigate the performance of the cooling system with different ***30%,50% or 80% generator loads,the temperatures meet the design ***,it is a little over the requirement at 100%load,duo to experimental errors and some unknown thermal *** the test at 100%load,the developing trends of the parameters of these two generators are similar and only minor differences occurs when they reach steady state our work can be benefit for the design and improvement of MW wind-driven generator cooling solutions.

关键词： wind-driven generator stator cooling channels cooling method, experimental study

Experiment on Spray Cooling Performance with Different Additives of Different Mass Fraction

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2016年第3期33卷 375-385页

作者： Wang Yu Zhou Nianyong Qian Xiaohui jiang yanlong College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

As an efficient cooling method for high heat flux field,spray cooling has a great application potential on aircraft directed energy weapon *** on previous research results,an experimental system of open-loop spray cooling was established,and the potassium chloride aqueous solutions and ethylene glycol aqueous solutions with different mass fractions were applied to investigate the influence of different additives on spray cooling system ***,theoretical analysis was conducted according to the droplet breakage principle and the characteristic parameters of fluid *** results indicate that heat transfer can be enhanced by adding potassium chloride up to a certain concentration and then decrease with higher *** transfer is deteriorated with the increase of ethylene glycol *** of the two additives can reduce the freezing point of the system,and ethylene glycol is preferred to improve the application range of the system in consideration of the corrosion of salt solution.

关键词： spray cooling potassium chloride ethylene glycol heat transfer coefficient

Performance Evaluation Methods for Multi-stream Plate-Fin Heat Exchanger

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2017年第5期34卷 553-560页

作者： Li Jun Wang Yu jiang yanlong Shi Hong Zheng Wenyuan School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou 215009 P. R. China College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing 210016 P. R. China

Mathematical model of cross type multi-stream plate-fin heat exchanger is ***,mean square error of accumulative heat load is normalized by dimensionless,and the equations of temperature-difference uniformity factor are *** factors above and performance of heat exchanger are compared and analyzed by taking aircraft three-stream condenser as an *** results demonstrate that the mean square error of accumulative heat load is common result of total heat load and excess heat load between *** it can be influenced by passage arrangement,flow inlet parameters as well as flow *** parameter of mean square error of accumulative heat load can reflect the influence of passage arrangement to heat exchange performance and will not change dramatically with the variation of flow inlet parameters and flow ***-difference uniformity factor is influenced by passage arrangement and flow *** remains basically unchanged under a certain range of flow inlet parameters.

关键词： multi-stream plate-fin heat exchanger mean square error of accumulative heat load temperature-difference uniformity factor performance evaluation

Protective effect of recombinant Lactobacillus plantarum against H_(2)O_(2)-induced oxidative stress in HUVEC cells

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2021年第5期22卷 348-365,I0001页

作者： Guan WANG Mingyue HAO Qiong LIU yanlong jiang Haibin HUANG Guilian YANG Chunfeng WANG College of Veterinary Medicine Jilin Provincial Engineering Research Center of Animal ProbioticsKey Laboratory of Animal Production and Product Quality Safety of Ministry of EducationJilin Agricultural UniversityChangchun 130118China College of Agronomy Jilin Agricultural UniversityChangchun 130118China

This study probed the protective effect of recombinant Lactobacillus plantarum against hydrogen peroxide(H_(2)O_(2))-induced oxidative stress in human umbilical vein endothelial cells(HUVECs).We constructed a new functional ***(NC8-pSIP409-alr-angiotensin-converting enzyme inhibitory peptide(ACEIP))with a double-gene-labeled non-resistant screen as an expression vector.A 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide(MTT)colorimetric assay was carried out to determine the cell viability of HUVEC cells following pretreatment with *** cytometry(FCM)was used to determine the apoptosis rate of HUVEC *** aspartate specific proteinase(caspase)-3/8/9 activity was also assayed and western blotting was used to determine protein expression of B-cell lymphoma 2(Bcl-2),Bcl-2-associated X protein(Bax),inducible nitric oxide synthase(iNOS),nicotinamide adenine dinucleotide phosphate oxidase 2(gp91phox),angiotensin II(AngII),and angiotensin-converting enzyme 2(ACE2),as well as corresponding indicators of oxidative stress,such as reactive oxygen species(ROS),mitochondrial membrane potential(MMP),malondialdehyde(MDA),and superoxide dismutase(SOD).NC8-pSIP409-alr-ACEIP attenuated H_(2)O_(2)-induced cell death,as determined by the MTT ***8-pSIP409-alr-ACEIP reduced apoptosis of HUVEC cells by *** addition,compared to the positive control,the oxidative stress index of the H_(2)O_(2)-induced HUVEC(Hy-HUVEC),which was pretreated by NC8-pSIP409-alr-ACEIP,iNOS,gp91phox,MDA,and ROS,was decreased obviously;SOD expression level was increased;caspase-3 or-9 was decreased,but caspase-8 did not change;Bcl-2/Bax ratio was increased;permeability changes of mitochondria were inhibited;and loss of transmembrane potential was *** of the hypertension-related protein(AngII protein)in HUVEC cells protected by NC8-pSIP409-alr-ACEIP decreased and expression of ACE2 protein *** plantarum results suggested that

关键词： Oxidative stress Apoptosis Human umbilical vein endothelial cell(HUVEC) Hydrogen peroxide(H_(2)O_(2))

农药液滴撞击移动液膜和非对称冠状水花形成机理分析

在线全文

学校读者我要写书评

暂无评论

农业机械学报 2021年第5期52卷 83-91页

作者：赵可王瑜蒋彦龙南京航空航天大学飞行器环境控制与生命保障工业和信息化部重点实验室南京210016 南京工业大学城市建设学院南京210009

研究农药液滴在植物表面的撞击规律对于提高农药喷雾效率、促进农业病虫害治理具有重要意义。采用CLSVOF(Coupled level set and volume of fluid)方法建立单液滴撞击水平运动液膜的数值模型,通过分析撞击后液体内部的压力分布、速度分... 详细信息

研究农药液滴在植物表面的撞击规律对于提高农药喷雾效率、促进农业病虫害治理具有重要意义。采用CLSVOF(Coupled level set and volume of fluid)方法建立单液滴撞击水平运动液膜的数值模型,通过分析撞击后液体内部的压力分布、速度分布和涡量云图,验证了运动间断、射流形成和射流顶部末端飞溅机制,揭示了非对称水花形成机理。由计算结果可知,液膜流动产生冠状水花主要体现在两侧射流发展行为不一致、冠基厚度不均匀和两侧射流末端飞溅现象不对称,并且受液膜流动惯性的影响,冠基随着液膜流动发生迁移,当无量纲速度U=0.8、无量纲时间T=3.47时,冠基完全迁移至撞击点右侧;颈部压差机制导致射流形成,射流的发展由液滴的径向运动和射流端部的旋涡共同决定,随着液膜流速的增大(0~0.8),上游的射流沿水平方向快速生长,下游射流则倾向于垂直向上延伸,两侧射流末端运动速度均增大;液滴径向运动速度和铺展速度之间的速度差决定了射流末端飞溅状态,上游液膜流动方向与液滴铺展方向相反,故上游末端飞溅行为比下游显著。

关键词：移动液膜液滴撞击射流冠状水花非对称机理分析

在线全文

学校读者我要写书评

暂无评论

电子设备用冷板散热特性的二维数值模拟

南京航空航天大学学报 2006年第4期38卷 419-422页

作者：余莉蒋彦龙李萍南京航空航天大学航空宇航学院南京210016 南京审计学院工程管理系南京210029

冷板是当前最常用的一种电子设备散热方式,虽然冷板的温度分布是个典型的三维导热型问题,但人们普遍关心的是冷板加热面、冷却面的二维温度分布情况。本文首先对单片冷板的散热特性进行了分析,在此基础上建立起相应的数学模型和微分控... 详细信息

冷板是当前最常用的一种电子设备散热方式,虽然冷板的温度分布是个典型的三维导热型问题,但人们普遍关心的是冷板加热面、冷却面的二维温度分布情况。本文首先对单片冷板的散热特性进行了分析,在此基础上建立起相应的数学模型和微分控制方程组。通过将电子设备发热量、对流散热量及厚度方向上的导热量当成冷板的内热源,将复杂的三维问题简化为二维问题,并进行了数值模拟。计算结果与实验结果吻合良好,为复杂模型的简化计算提供了参考。

关键词：电子设备冷板散热数值模拟

在线全文

学校读者我要写书评

暂无评论

核电厂电动主给水泵热启动的振动特性试验

振动．测试与诊断 2018年第6期38卷 1182-1186,1293页

作者：杨璋孙程斌蒋彦龙南京航空航天大学航空宇航学院南京210016 福建宁德核电有限公司宁德355200

试验研究了某国产压水堆核电机组(CPR 1000)电动主给水泵压力级转子热启动过程的振动特性,并提出优化运行措施。采用高采样率的振动数据采集设备,测试电动主给水泵在50%负荷、100%负荷联锁启动及再循环工况热启动时压力级泵的振动信号,... 详细信息

试验研究了某国产压水堆核电机组(CPR 1000)电动主给水泵压力级转子热启动过程的振动特性,并提出优化运行措施。采用高采样率的振动数据采集设备,测试电动主给水泵在50%负荷、100%负荷联锁启动及再循环工况热启动时压力级泵的振动信号,发现启动过程中压力级转子存在振动较快上升然后缓慢下降至稳定的现象。通过分析振动趋势图、振动频谱图及振动轴心轨迹图等认为这属于渐变性强迫振动,振动变化至稳定的时间约为20min。根据压力级转子的结构特点,建立带初始热弯曲的Jeffcott转子动力学模型,分别研究弯曲变形和质量偏心的影响,认为压力级转子热备用期间存在暂态热弯曲是导致渐变性热致振动的主要原因,且通过实测壳体端面的热成像图得到验证。电动主给水泵的振动特性表明,热启动过程中应分别设置瞬态振动延时保护与稳定运行期间的振动定值保护。

关键词：核电厂主给水泵热弯曲热致振动

Synthetic Study towards Pre-schisanartanin C

在线全文

学校读者我要写书评

暂无评论

Synthetic Study towards Pre-schisanartanin C

第十七届全国金属有机化学学术讨论会

作者： Yong Li Yixin Han yanlong jiang Jiahua Chen Zhen Yang College of Chemistry Peking University

＜正＞～～

关键词：

来源： cnki会议 cnki会议评论

在线全文

学校读者我要写书评

暂无评论

无气库型脉管制冷机调相性能

南京航空航天大学学报 2008年第1期40卷 51-54页

作者：蒋彦龙李华林曹业玲南京航空航天大学航空宇航学院南京210016

基于流体网络理论,利用Matlab编制了脉管制冷机调相计算程序,分析了有气库和无气库条件下的惯性管和双向进气型脉管制冷机的调相性能。在此基础上提出了双向进气和惯性管联合工作的耦合型无气库型脉管制冷机的理论设想,并进行了调相特... 详细信息

基于流体网络理论,利用Matlab编制了脉管制冷机调相计算程序,分析了有气库和无气库条件下的惯性管和双向进气型脉管制冷机的调相性能。在此基础上提出了双向进气和惯性管联合工作的耦合型无气库型脉管制冷机的理论设想,并进行了调相特性研究。该成果对于发展结构紧凑、系统能耗低的新一代无气库型脉管制冷机具有参考价值。

关键词：流体力学调相脉管制冷机流体网络理论