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自由电弧
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  free arc
     The electrical characteristics of variable polarity plasma arcVPPAare quite different from free arc and DC plasma arc.
     变极性等离子弧(VPPA)电特性与自由电弧和直流等离子弧相比,具有众多不同的特性。
短句来源
  free-burning arc
     In this paper a theoretical and experimental study of the temperature and flow fields of a free-burning arc under a transverse magnetic field is presented.
     本文从理论和实验方面研究了横向磁场作用下自由电弧的温度场和速度场。
短句来源
  “自由电弧”译为未确定词的双语例句
     An arc plasma temperature distribution was also obtained in our application experiment of this approach.
     作为一个应用实例,结合谱线相对强度测量方法重建了自由电弧等离子体的三维温度场分布.
短句来源
     Herefrom, the theory of arc inertia is proposed and verified by the high speed protography with 20000 photos/sec.
     由此提出自由电弧在脉冲电流作用下,其形态的动态过程属惯性系统的假设,并用20000幅/S的高速摄影进行了验证。
短句来源
     THE TEMPERATURE AND FLOW FIELDS OF A FREE BURNING ARC UNDER A TRANSVERSE MAGNETIC FIELD
     横向磁场作用下自由电弧的温度场与速度场
短句来源
     The diagnostics of 3 D arc temperature fields by the Talbot effect Moire technique and limited angle tomography algorithm has been studied on the basis of arc plasma physics.
     结合光栅Talbot效应和莫尔技术,利用有限角计算机层析算法,借助电孤等离子体物理方程,对自由电弧三维温度场进行了诊断研究。
短句来源
     The reconstruction experiment of the arc plasma tempreture is fulfilled combining the optical computed tomography with the absolute spectral intensity method in the plasma diagnosis.
     结合光学层析重建算法及等离子体光谱诊断中的谱线绝对强度法进行自由电弧等离子体温度场重建实验。
短句来源
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  相似匹配句对
     freedom;
     自由 ;
短句来源
     Freedom
     自由
短句来源
     MODEL OF FREE BURNING ARC AT THERMAL EMISSION CATHODE ZONE
     自由电弧热发射阴极的物理模型
短句来源
     MODELING OF THE HEAT TRANSFER AND FLUID FLOW IN A FREE-BURNING ARC
     自由燃烧电弧中传热与流动的数值模拟
短句来源
     Voltage Flicker of Arc Furuates(1)
     电弧炉的电压闪变
短句来源
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  free arc
It is proved that there is no chaotic group actions on any topological space with free arc.
      
The long pedicle allows for a wide, tension-free arc of rotation.
      
To obtain our estimate we will use Beurling's free arc method.
      
  free-burning arc
The investigations were carried out in a free-burning arc with water-cooled electrodes.
      
A free-burning arc in argon at atmospheric pressure provides a plasma in local thermodynamic equilibrium.
      
Parameters of free-burning arc discharge plasma in air with silver-based electrodes
      
Temperature fields in the coalesced, axially symmetric portion of the arc are determined spectrometrically and compared to those of a classical single-cathode free-burning arc.
      
Numerical analysis of the behavior of hydrogen added into a free-burning arc
      


Nowadays applications of the thermal plasma play a more and more important role in energy saving and exploiting. In this paper a theoretical and experimental study of the temperature and flow fields of a free-burning arc under a transverse magnetic field is presented. The intensity distributions of a cylindrically asymmetric arc are measured from seven directions of observation in order to determine the emission coefficients and the temperature fields in terms of Maldonado-Olsen's transformation. The flow fields...

Nowadays applications of the thermal plasma play a more and more important role in energy saving and exploiting. In this paper a theoretical and experimental study of the temperature and flow fields of a free-burning arc under a transverse magnetic field is presented. The intensity distributions of a cylindrically asymmetric arc are measured from seven directions of observation in order to determine the emission coefficients and the temperature fields in terms of Maldonado-Olsen's transformation. The flow fields are then obtained with the aid of the energy equation and the continuity equation. Finally, a analysis of the experimental and calculated results shows that the induced mass flow inside the arc column should originate from the curly Lorentz force. It is expected to find more applications in the area of the enery science.

热等离子体的应用在节约能源和能源开发方面起着愈来愈重要的作用。本文从理论和实验方面研究了横向磁场作用下自由电弧的温度场和速度场。从七个方向测量了非柱对称弧柱的谱线强度H_β的分布。再通过Maldonado-Olsen转换求得发射系数场和温度场。借助于能量方程、连续方程等数值计算得到弧柱中的速度场。最后,对实验和计算结果进行了讨论,提出了有旋洛伦兹力能感应出流场的物理机制,它将有助于热等离子体在能源科学中获得更广泛的应用。

A new welding process,the magnet constricted vacuum plasma arc (MCVP arc)welding,is introduced in this article.The arc is obtained by applying a magneticfield coaxial with the electrode to constrict an open arc in medium vacuum.It isobserved in the experiments that along with the lowering of the atmosphere pressure,the open arc gets larger and larger,and the current density in the arc root zonebecomes lower and lower until an instable“side arc”appears and then the arc goesout.The open arc in medium vacuum can...

A new welding process,the magnet constricted vacuum plasma arc (MCVP arc)welding,is introduced in this article.The arc is obtained by applying a magneticfield coaxial with the electrode to constrict an open arc in medium vacuum.It isobserved in the experiments that along with the lowering of the atmosphere pressure,the open arc gets larger and larger,and the current density in the arc root zonebecomes lower and lower until an instable“side arc”appears and then the arc goesout.The open arc in medium vacuum can be hardly constricted by means of themechanical constricting method for common plasma arc.However,the vacuum arccan be constricted effectively by a coaxial magnetic field and the constricting effectgets more obvious as the atmosphere pressure decreases.When the pressure is lowerthan 1.33×10~2 Pa,a megnetic field of one over several tens of Tesla can make thediameter of the MCVP arc column from top to bottom nearly the same and onlyslightly thicker than the electrode.As a heat source,the MCVP arc can weld thecommon and active metals.Its penetrating ability is higher than that of commonTIG arc.The energy distribution can be adjusted by regulating the magnetic fielddensity.There are distinctive advantages of this welding process over the conventionalTIG,plasma arc and electron beam welding.

本文介绍了一种新的焊接方法——真空磁压缩等离子弧焊接。真空磁压缩等离子弧是将低真空中的自由电弧用与电极同轴向的磁场压缩后获得的。实验表明,随着气压的降低,自由电弧会越来越扩展,弧根区的电流密度越来越低,直至产生“旁弧”,不能稳定燃烧而熄灭。而且这种低真空自由电弧难以用和普通等离子弧相似的机械方法压缩。采用轴向磁场可以有效地压缩真空电弧。磁压缩的效果随气压的降低趋于明显,气压低于1.33×10~2Pa 时,几十分之一特斯拉(T)的磁场就可获得略粗于电极、上下直径近似相等的弧柱,我们称之为真空磁压缩等离子弧。使用真空磁压缩等离子弧作为热源,可以焊接一般金属和活泼金属,其熔透工件的能力可超过大气氩弧,并可用调节磁场强度的方法,调节电弧的能量分布。与常规氩弧焊、等离子孤焊、电子束焊相比,真空磁压缩等离子弧焊接有其独到的优点,可望在不久的将来获得广泛的应用。

In the study of the electric current and voltage wareform the phenomenon has been discovered that the arc power increases with the rise in frequecy. Herefrom, the theory of arc inertia is proposed and verified by the high speed protography with 20000 photos/sec. having investigated the controllability of arc inertia it has discovered that the free arc can be controlled in the unstable state by a high frequency pulse current. In this time the pulse voltage of arc increases remarkally. This result is called the...

In the study of the electric current and voltage wareform the phenomenon has been discovered that the arc power increases with the rise in frequecy. Herefrom, the theory of arc inertia is proposed and verified by the high speed protography with 20000 photos/sec. having investigated the controllability of arc inertia it has discovered that the free arc can be controlled in the unstable state by a high frequency pulse current. In this time the pulse voltage of arc increases remarkally. This result is called the high-frequecy effect of arc.

本文通过研究脉冲焊电弧的电流、电压波形,发现电弧功率随频率增加而提高。由此提出自由电弧在脉冲电流作用下,其形态的动态过程属惯性系统的假设,并用20000幅/S的高速摄影进行了验证。通过对惯性系统电孤的可控性分析,发现自由电孤可由高频脉冲电流控制在非稳定状态上,此时电弧脉冲电压明显提高,这就是电弧的高频效应。本文还研究了影响高频效应的几个主要因素,着重分析了维弧电流的作用,提出高频时由于电弧的惯性,瞬间电流停止并不会导致电弧熄灭,因此得出高频焊不需要维弧电流的结论。

 
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