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国家自然科学基金(10905044)

作品数:4 被引量:4H指数:1
相关作者:林榕谭畅韩先伟邓永锋更多>>
相关机构:陕西动力机械设计研究所更多>>
发文基金:国家自然科学基金更多>>
相关领域:理学一般工业技术化学工程核科学技术更多>>

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大气环境电子束材料表面强化机理数值模拟被引量:1
2011年
建立了大气环境电子束材料表面强化过程的多阶段数值模型,用于对电子束与材料表面层的相互作用过程和结构与相变过程进行研究。通过应用这一模型,使得对材料表面强化中电子束传输、温度演化和相变动力学等多参数研究成为可能,由此建立了电子束输入参数与结构相变结果之间的关系。
邓永锋林榕韩先伟谭畅R.N.RizakhanovA.A.Barmin
关键词:电子束
Numerical Simulation of the Self-Heating Effect Induced by Electron Beam Plasma in Atmosphere被引量:2
2012年
For exploiting advantages of electron beam air plasma in some unusual applications, a Monte Carlo (MC) model coupled with heat transfer model is established to simulate the characteristics of electron beam air plasma by considering the self-heating effect. Based on the model, the electron beam induced temperature field and the related plasma properties are investigated. The results indicate that a nonuniform temperature field is formed in the electron beam plasma region and the average temperature is of the order of 600 K. Moreover, much larger volume pear-shaped electron beam plasma is produced in hot state rather than in cold state. The beam ranges can, with beam energies of 75 keV and 80 keV, exceed 1.0 m and 1.2 m in air at pressure of 100 torr, respectively. Finally, a well verified formula is obtained for calculating the range of high energy electron beam in atmosphere.
邓永锋谭畅韩先伟谭永华
关键词:SELF-HEATINGGEANT4
飞行器等离子体减阻技术研究
<正>提高飞行器气动性能的基本要求是减小飞行器阻力,增加升力和提高升阻比,以便提高飞行速度和增加航程,从而减少飞行器燃料的消耗并且节省运输成本。从节能以及最大限度地提高飞行器性能这两种观点来看,减阻都具有最大潜力。即使飞...
余虔谭畅魏建国韩先伟
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Numerical and Experimental Investigation of Electron Beam Air Plasma Properties at Moderate Pressure被引量:1
2014年
Large size of air plasma at near atmospheric pressure has specific effects in aerospace applications. In this paper, a two dimensional multi-fluid model coupled with Monte Carlo (MC) model is established, and some experiments were carried out to investigate the characteristics of electron beam air plasma at pressure of 100-170 Torr. Based on the model, the properties of electron beam air plasma are acquired. The electron density is of the order of 1016 m-3 and the longitudinal size can exceed 1.2 m. The profiles of charged particles demonstrate that the oxygen molecule is very important for air plasma and its elementary processes play a key role in plasma equilibrium processes. The potential is almost negative and a very low potential belt is observed at the edge of plasma acting as a protection shell. A series of experiments were carried out in a low pressure vacuum facility and the beam plasma densities were diagnosed. The experimental results demonstrate that electron density increased with the electron beam energy, and the relatively low pressure was favorable for gaining high density plasma. Hence in order to achieve high density and large size plasma, it requires the researchers to choose proper discharge parameters.
邓永锋谭永华韩先伟
强流轴向电子枪束流特性计算机模拟
电子枪是电子束的产生装置,束流能量、大小、分布、以及稳定性等束流参数取决于电子枪阴极的材料选取、温度设置、阳极的结构和电压设置。为了得到理想的束流,优化电子枪的结构、合理设置各阳极电压以及阴极温度是电子枪设计必不可少的工...
王飞张晰哲谭畅韩先伟
关键词:电子枪电子束
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非真空条件下高能电子束传输特性的蒙特卡罗研究
基于Geant4蒙特卡罗程序包,建立了非真空条件下高能电子束的输运模型,并采用该模型详细研究了电子束在非真空条件的传输特性。研究结果表明非真空条件下电子束传输特性与真空下的特性具有较大差异,环境气体对电子束具有散射作用,...
邓永锋谭畅韩先伟
关键词:电子束传输特性蒙特卡罗
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大气环境电子束等离子体自加热效应数值研究
<正>近几十年来,随着等离子体产生技术的发展及其应用领域的扩展,许多应用领域,如材料表面改性、废气处理、高超声速进气道附面层控制和超燃燃烧室助燃等都要求产生稳定可靠、大体积、高密度非均匀等离子体。高能电子束与气体碰撞产生...
邓永锋谭畅韩先伟
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Ion-Beam Surface Modification of Strut Dowel Used in ITER PF Support
2013年
In this paper, surface modification of the strut dowel used in ITER PF support is reported. Different ions (nitrogen/titanium) with different doses are implanted into the surface of strut dowel. The result of Auger Electron Spectroscopy (AES) indicates that nitrogen can be implanted more deeply than titanium under the implantation condition of 60 kV accelerating voltage and a dose of 8×10^17/cm2 nitrogen. Surface Micro Hardness (SMH) and wear resistance are improved remarkably. Further SEM observation shows that there are no obvious scratches and damages after wear test.
罗蓉蓉李鹏远韩石磊孙振超潘传杰沈丽茹金凡亚
关键词:ITERPFCS
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