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The anchoring of gaseous jet diffusion flames in stagnant air

机译:停滞空气中气体喷射扩散火焰的锚定

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摘要

A numerical analysis is presented to describe the structure of the attachment region of gaseous jet diffusion flames in stagnant air. For the typical Reynolds numbers encountered in applications, the region of flame attachment, in the near wake at the injector rim, is small compared with the injector radius. The local flow, which we consider to be laminar, quasi-steady and two-dimensional, is determined by the wall value of the fuel stream velocity gradient and the chemical reaction time or residence time in the premixed flame of a stoichiometric mixture of the fuel stream and required amount of air. When the Karlovitz number, or product of the velocity gradient and the flame residence time, grows above a critical value the flame is lifted off the injector.
机译:进行了数值分析,描述了停滞空气中气态射流扩散火焰的附着区域结构。对于在应用中遇到的典型雷诺数,在喷射器边缘近尾流处的火焰附着区域比喷射器半径小。我们认为是层流的,准稳定的和二维的局部流动是由燃料流速度梯度的壁值以及燃料的化学计量混合物在预混火焰中的化学反应时间或停留时间决定的流和所需的空气量。当卡洛维兹数或速度梯度与火焰停留时间的乘积增长到临界值以上时,火焰就从喷射器中升起。

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