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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Experiments on the formation of a recirculation zone in swirling coaxial jets
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Experiments on the formation of a recirculation zone in swirling coaxial jets

机译：旋转同轴射流形成回流区的实验

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The near flow field of coaxial air jets, with swirl in the outer one, was studied using flow visualization and hot-wire anemometry. The flow is sensitive to both the swirl number and the mass flow ratio between the outer and inner jets. A necessary condition for the formation of an internal recirculation zone (IRZ) is that the swirl number must exceed a minimum value which depends on the mass flow ratio. Spectral analysis of the velocity fluctuations indicates that the formation of an IRZ in the present flow does not appear to be related to the growth of convective flow instabilities. Analysis of the flow visualization and X-wire data indicates that the vorticity dynamics model for vortex breakdown proposed by Brown and Lopez [J Fluid Mech (1990) 222: 553] provides a plausible mechanism for the formation of an IRZ in this flow. [References: 22]
机译：使用流动可视化和热线风速仪研究了同轴空气射流的近流场，外层有涡流。流动对旋流数和内，外射流之间的质量流量比均敏感。形成内部再循环区（IRZ）的必要条件是，涡旋数必须超过取决于质量流量比的最小值。速度波动的频谱分析表明，当前流动中IRZ的形成似乎与对流流动不稳定性的增长无关。对流动可视化和X线数据的分析表明，Brown和Lopez提出的涡旋破裂的动力学模型[J Fluid Mech（1990）222：553]提供了在该流动中形成IRZ的合理机制。 [参考：22]

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