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首页> 外文期刊>International Journal of Heat and Fluid Flow >Flow structure in the near-field of buoyant low-density gas jets
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Flow structure in the near-field of buoyant low-density gas jets

机译：浮力低密度气体射流近场的流动结构

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Flow structure of helium jets injected into quiescent air was investigated numerically using finite volume approach. The analysis is based on unsteady, laminar, axisymmetric, isothermal flow in a binary fluid system. The jet Reynolds number, Re was varied from 40 to 150 to encompass steady and oscillating jet flow regimes. Comparison with experimental data revealed excellent agreement, proving reliability of the model in predicting global flow characteristics. At low jet Reynolds numbers, the flow was steady and the concentration shear layer at the tube exit was stratified by mixing between jet and ambient fluids inside the tube. At higher jet Reynolds numbers (Re = 90 and 150), buoyancy induced acceleration contracted the jet core to form a toroidal vortex by entrainment of the ambient fluid. Structural details of the globally unstable flow are discussed using instantaneous, mean and RMS profiles of helium concentration and axial velocity.
机译：采用有限体积法对注入静态空气的氦气射流的流动结构进行了数值研究。该分析基于二元流体系统中的非稳态，层流，轴对称，等温流动。射流雷诺数Re从40变到150，以涵盖稳定和振荡的射流流态。与实验数据的比较显示出极好的一致性，证明了该模型在预测整体流动特性方面的可靠性。在低雷诺数下，流量稳定，并且在管出口处的浓度剪切层通过管内射流与环境流体之间的混合而分层。在较高的雷诺数下（Re = 90和150），浮力引起的加速度通过夹带环境流体使射流芯收缩而形成环形涡流。使用氦浓度和轴向速度的瞬时，均值和RMS曲线讨论了全局不稳定流的结构细节。

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