底面加热一侧全开圆柱形腔体对环境风的耦合热损失特性数值模拟

发布时间：2018-06-13 00:46

本文选题：圆柱形腔体 + 底面加热　；参考：《中国电机工程学报》2014年20期

【摘要】：在考虑物性变化的基础上,对环境风(不同风速V和风向角α)下一侧全开圆柱形腔体仅底面受到均匀热流加热时的耦合热损失(对流、辐射和导热)特性进行三维数值模拟,得到了腔体内部和腔体开口面的温度和速度分布以及对流热损失平均努塞尔数Nuc、辐射热损失平均努塞尔数Nur随风速V和风向角α的变化曲线。结果表明:当风向角α=90°时,腔体内部和开口面附近的温度分布和速度分布与无风时十分类似,但风向角为其他值时,其分布规律与无风时差异很大;垂直风(α=90°)时,随着V的增大,Nuc缓慢减小而Nur缓慢增加,其他风向时,随着V的增大,Nuc逐渐增大而Nur逐渐减小;风速不变时,存在临界的风向角α使得Nuc最大,同时Nur达到最小值。
[Abstract]:On the basis of considering the change of physical properties, the coupled heat loss (convection, radiation and heat conduction) characteristics of a fully open cylindrical cavity with only the bottom surface of one side under the ambient wind (different wind speed V and wind direction angle 伪) under uniform heat flux are numerically simulated. The curves of temperature and velocity distribution, average Nussel number of convection heat loss and average Nur number of radiation heat loss with wind speed V and wind direction angle 伪 are obtained. The results show that the temperature distribution and velocity distribution in the cavity and near the opening surface are very similar when the wind direction angle is 90 掳, but when the wind direction angle is other values, the distribution law is very different from that when the wind direction angle is in the absence of wind, and when the wind is in the vertical wind (伪 ~ 90 掳), With the increase of V, Nuc decreases slowly and Nur increases slowly, and with the increase of other wind directions, Nuc increases and Nur decreases. When the wind speed is constant, the critical wind direction 伪 makes Nuc maximum and Nur reaches the minimum.
【作者单位】：低品位能源利用技术及系统教育部重点实验室(重庆大学);
【基金】：国家自然科学基金项目(51076171)~~
【分类号】：TM615

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