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首页> 外文学位 >EXPERIMENTAL AND THEORETICAL RESULTS FOR LOW CURRENT D.C. ARC IN NOZZLE FLOWS AND CALCULATION OF COLD FLOW FIELD AND CORRELATION WITH EXPERIMENTAL DATA FOR ASYMMETRICAL FLOW CIRCUIT BREAKER NOZZLES (GAS DYNAMICS, NUMERICAL, FINITE ELEMENT METHOD).
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EXPERIMENTAL AND THEORETICAL RESULTS FOR LOW CURRENT D.C. ARC IN NOZZLE FLOWS AND CALCULATION OF COLD FLOW FIELD AND CORRELATION WITH EXPERIMENTAL DATA FOR ASYMMETRICAL FLOW CIRCUIT BREAKER NOZZLES (GAS DYNAMICS, NUMERICAL, FINITE ELEMENT METHOD).

机译：喷嘴流中低电流D.C. ARC的实验和理论结果以及冷流场的计算及其与非对称流断路器喷嘴的实验数据的相关性（气体动力学，数值，有限元方法）。

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摘要

To increase the basic knowledge concerning the interaction between the arc near current zero and the cold flow, investigations were conducted to determine the D.C. arc characteristics at a current of approximately 100 A in various nozzle geometries. Analytical expressions were derived for the arc radius, electric field strength, arc voltage, resistance, and power as functions of the cold flow properties, current and axial distance.; A computer program based on the finite element method had been developed to calculate the subsonic flow field and the mass flux for the asymmetric dual-flow nozzle as well as the single-flow and symmetric dual-flow nozzles. The supersonic flow properties and the mass flux in the conical nozzle were also calculated by assuming the one-dimensional source flow. A characteristic method is used to design and calculate the supersonic nozzle contour which can generate smooth and axial flow at the nozzle exit. The flow field in this supersonic nozzle can also be calculated by the characteristic method and using a computer program.; The calculated results for the arc and the nozzle cold flow properties agreed well with the experimental measurements. It can be concluded that the convection cooling of the arc is the dominant arc cooling process for low currents. The computer program can provide a good tool in designing the arc interrupter nozzle.
机译：为了增加有关零电流附近的电弧和冷流之间相互作用的基本知识，进行了研究以确定在各种喷嘴几何形状下电流约为100 A时的直流电弧特性。得出了电弧半径，电场强度，电弧电压，电阻和功率与冷流特性，电流和轴向距离的函数的解析表达式。已经开发了基于有限元方法的计算机程序，以计算非对称双流喷嘴以及单流和对称双流喷嘴的亚音速流场和质量通量。通过假定一维源流，还可以计算出圆锥形喷嘴中的超声速流动特性和质量通量。使用特征方法来设计和计算超音速喷嘴轮廓，该轮廓可以在喷嘴出口处产生平滑的轴向流。该超音速喷嘴中的流场也可以通过特征方法并使用计算机程序来计算。电弧和喷嘴冷流特性的计算结果与实验测量结果非常吻合。可以得出结论，对于低电流，电弧的对流冷却是主要的电弧冷却过程。该计算机程序可以为设计灭弧嘴提供良好的工具。

著录项

  • 作者

    WHANG, HO-CHANG.;

  • 作者单位

    Rensselaer Polytechnic Institute.;

  • 授予单位 Rensselaer Polytechnic Institute.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 258 p.
  • 总页数 258
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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