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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation of the thermal field of a turbulent plume guided by a cylinder - preliminary results
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Experimental investigation of the thermal field of a turbulent plume guided by a cylinder - preliminary results

机译：圆柱引导的湍流羽流温度场的实验研究-初步结果

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This investigation analyses the turbulent structure of a thermal plume created by a heated disc, evolving in a neutral environment and guided by a vertical cylinder located I cm above the level of the hot source. The objectives of the study were to understand the development mechanisms of this buoyancy driven flow and the effect of the vertical cylinder on the horizontal entrainment of the plume. The experimental results show clearly a change of the turbulent structure of the flow in comparison with the free plume. This difference is especially characterised by the strong decrease of the mean axial temperature near the source and the appearance of two symmetrical maxima resulting from vortices of hot air that divide the flow in two symmetrical regions separated by a region fed by fresh air. This phenomenon is also observed for the turbulence statistics. The skewness and flatness factors of the temperature fluctuations show that the latter have a nearly Gaussian distribution in the most turbulent regions of the flow, but that deviates gradually from the Gaussian distribution in the regions where the amplitude of the temperature fluctuations decreases. (C) 2004 Elsevier Inc. All rights reserved.
机译：这项研究分析了由加热盘产生的热羽的湍流结构，该盘在中性环境中演化并由位于热源水平面上方1 cm的垂直圆柱体引导。该研究的目的是了解这种浮力驱动流的发展机理以及垂直圆柱对烟羽水平夹带的影响。实验结果清楚地显示了与自由羽流相比，湍流结构的变化。这种差异的特点是，源附近的平均轴向温度大大降低，并且出现了两个对称的最大值，这是由于热空气的涡流将气流分成两个对称区域，该两个对称区域被新鲜空气供给的区域隔开。在湍流统计中也观察到该现象。温度波动的偏度和平坦度因子表明，后者在流动的最湍流区域中具有接近高斯分布，但在温度波动幅度减小的区域中逐渐偏离高斯分布。 （C）2004 Elsevier Inc.保留所有权利。

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