Formation and Evolution of Rayleigh-Bénard Streaks in Rotating Cavities
Formation and Evolution of Rayleigh-Bénard Streaks in Rotating Cavities
复制标题
旋转腔中瑞利-贝纳德条纹的形成和演化
DOI：
10.1115/gt2018-75497
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Martin George Rose
中科院分区：
文献类型：
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作者：
M. R. Puttock;Martin George Rose
本文用数值方法研究了双腔体中的瑞利-贝纳德条纹现象。本文采用Sussex大学多腔实验装置（MCR）的实验数据作为边界条件，采用k-ω SST湍流模型对MCR的三腔模型进行了非定常数值模拟。一个四点验证使用比较实验和历史数据集，并显示令人鼓舞的协议。
Rayleigh-Bénard条纹沿着旋转腔（护罩）的外围发展，并且由于周向压力梯度，仅与气旋环流中涉及的流动相关。这些条纹修改本地努塞尔数高达40%以上的表面平均值，并给出了贡献的护罩的总传热，高达60%，可能是一个重要的因素，在进一步的工作有关旋转空腔在航空发动机。然而，需要实验确认，以确认结构的存在。
This paper presents numerical investigation into the phenomena of so-called Rayleigh-Bénard streaks inside rotating-cavities. Experimental data from the University of Sussex Multiple Cavity Rig (MCR) has been used as boundary conditions for Unsteady Reynolds-Averaged Navier-Stokes (URANS) calculation using the k-ω SST turbulence model on a three cavity model of the MCR. A four-point validation is presented using comparison to experimental and historical data sets and shows encouraging agreement.
The Rayleigh-Bénard streaks develop along the periphery of the rotating cavity (shroud) and are only associated with flow involved in cyclonic circulation due to the circumferential pressure gradient. These streaks modify the local Nusselt number by as much as 40% above the surface average and, given the contribution of the shroud to the total heat transfer, upwards of 60%, may be a significant factor in further work concerning rotating cavities in aero-engines. However experimental confirmation is required to ratify the existence of the structures.