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Modeling of flow separation of assist gas as applied to laser cutting of thick sheet metal

机译：辅助气体流分离建模用于厚金属板的激光切割

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摘要

The present paper describes the results of mathematical modeling of supersonic flows of a viscous compressible gas, obtained by numerically solving three-dimensional full Navier-Stokes equations, and also the results of experiments with visualization of gas jet flows in channels geometrically similar to the laser cut. Separation of the gas flow from the cut front is predicted numerically and then validated by experiments on a model setup. The gas flow structure arising in a narrow channel behind a sonic (conical) or supersonic nozzle is described. Specific features of originating in the flow separation on a smooth surface in a narrow channel are examined, and mechanisms controlling the separation are proposed. Flow separation directly affects the changes in the shape and structure of striations and is the one of main reason for the worse quality of the laser cut surface. It is shown that the changes in the structures of striations over the thickness of the sheet being cut are clo-sely related to aerodynamic features of jet flows of the assisting gas in the cut channel.
机译：本文描述了通过数值求解三维完整Navier-Stokes方程获得的粘性可压缩气体的超音速流动的数学模型化结果，以及可视化与激光相似的通道中的气体喷流的实验结果。切。用数值预测从切割锋面分离出的气流，然后通过模型设置的实验进行验证。描述了在声波（圆锥形）或超音速喷嘴后面的狭窄通道中产生的气流结构。研究了狭窄通道中光滑表面上的流体分离的具体特征，并提出了控制分离的机制。流动分离直接影响条纹的形状和结构的变化，并且是激光切割表面质量较差的主要原因之一。结果表明，在被切割的薄板的整个厚度上，条纹结构的变化与切割通道中辅助气体的射流的空气动力学特性密切相关。

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  • 来源
    《Applied Mathematical Modelling》 |2009年第9期|3730-3745|共16页
  • 作者

    O.B. Kovalev; P.V. Yudin; A.V. Zaitsev;

  • 作者单位

    Khristianovich's Institute of Theoretical and Applied Mechanics, Russian Academy of Sciences, 630190 Siberian Branch, Novosibirsk, Russian Federation;

    Khristianovich's Institute of Theoretical and Applied Mechanics, Russian Academy of Sciences, 630190 Siberian Branch, Novosibirsk, Russian Federation;

    Khristianovich's Institute of Theoretical and Applied Mechanics, Russian Academy of Sciences, 630190 Siberian Branch, Novosibirsk, Russian Federation;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    laser cutting; striations; flow separation;

    机译：激光切割条纹流分离;

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