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基于流场分析软件,结合UDF编程技术和动态网格技术,分别对二维串列放置的静止和振动的双圆柱在不同间距比时的对流传热特性进行了仿真分析.结果表明:二维串列双圆柱对流传热时,静止和振动条件下的间距比均存在一个临界值3.5,小于该临界值时,传热较弱,大于该临界值时,传热增强且随间距比的变化波动较小.在相同间距比下,振动时圆柱面平均Nu明显增大,对流传热能力显著提高.在不同间距比下,二维串列双圆柱绕流时,速度场和温度梯度场之间的协同程度不同,双圆柱的振动使场协同进一步得到改善,从而提高了双圆柱的对流传热能力.
Based on the flow field analysis software and the combination of UDF programming and dynamic grid technology, the convective heat transfer characteristics of two-dimensional tandem columns with static and vibration at different pitch ratios are simulated respectively. The results show that the two-dimensional In the case of convective heat transfer with tandem cylinders, there is a critical value of 3.5 for both pitches and pitches under static and vibration conditions. If the temperature is lower than the critical value, the heat transfer is weak. If the critical value is exceeded, the heat transfer increases and the variation with distance ratio With the same pitch ratio, the average Nu of the cylindrical surface increases obviously and the convective heat transfer ability increases significantly under the same pitch ratio.When the two-dimensional tandem double cylinder flows around at different pitches, the velocity field and the temperature gradient field The degree of synergy between the two cylinders is different, and the vibration of the double cylinder can further improve the field synergy, thus improving the convective heat transfer capacity of the double cylinder.