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首页> 外文期刊>International Journal of Heat and Fluid Flow >Numerical study of unsteady flow and heat transfer of circular tangential direction jets flowing over the inner cylinder surface in the annular chamber
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Numerical study of unsteady flow and heat transfer of circular tangential direction jets flowing over the inner cylinder surface in the annular chamber

机译：在环形腔室内流动圆形切线方向喷射的非定常流动和传热的数值研究

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In order to understand the dynamics of vortices on heat transfer, the unsteady flow field of tangential direction jets flowing in the annular chamber is numerically investigated by scale-adaptive simulation (SAS). The jet Reynolds number is 332,000 based on the jet's diameter and inflow velocity for a specific geometric model. The analogy theory is used to obtain the convective heat transfer coefficient distribution on the hub surface. Spectral analysis via fast Fourier transform (FFT) is used to analyze frequency information that flows inside the chamber. The proper orthogonal decomposition (POD) method is performed on the velocity field in the chamber and the convective heat transfer coefficient on the hub surface using a snapshot method. The fast Fourier transform helps find the dominant frequency of the unsteady flow in the chamber. The time sequence of velocity fields on the radial plane shows the presence of cyclic flapping of the jet. The proper orthogonal decomposition analysis indicates that the unsteady periodic flow phenomenon in the chamber and unsteady heat transfer on the hub surface are mainly related to the dynamics of the counter-rotating vortices caused by the jet.
机译：为了了解热传递上涡流的动态，通过尺度 - 自适应模拟（SAS）在数值研究环形室中流动的切向方向射流的不稳定流场。喷射雷诺数是基于特定几何模型的射流直径和流入速度的332,000。类比理论用于获得轮毂表面上的对流传热系数分布。通过快速傅里叶变换（FFT）的光谱分析用于分析腔室内流动的频率信息。使用快照方法对腔室中的速度场和集线器表面上的对流传热系数进行适当的正交分解（POD）方法。快速傅立叶变换有助于找到腔室中不稳定流动的主导频率。径向平面上的速度场的时间序列显示出射流的循环拍打的存在。适当的正交分解分析表明室内腔室中的非定常的周期性流动现象和集线器表面上的不稳定热传递主要与由喷射引起的反向旋转涡流的动态相关。

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