带斜孔肋大宽高比矩形通道的强化传热特性

发布时间：2017-12-27 00:15

本文关键词：带斜孔肋大宽高比矩形通道的强化传热特性　出处：《航空动力学报》2016年04期 　论文类型：期刊论文

【摘要】：为了获得带斜孔肋大宽高比矩形通道的强化传热特性,并寻求最佳的孔排倾斜角度,调节孔排倾斜角度和通道雷诺数,使其分别在0°~30°和3×10~4~9×10~4范围内变化,通过数值计算系统分析了通道摩擦因数和带肋壁努塞尔数等参数的变化规律.研究发现:相比于常规肋片,新型斜孔肋有效改善了肋片后方紧邻肋片的局部区域的壁面换热,并降低通道的摩擦因数,但传热增强因子有所减小;随着孔排倾斜角度的增大,通道的相对摩擦因子单调升高,传热增强因子则呈现出先升高后降低的变化过程,因此存在着最优孔排倾斜角度为15°,此时斜孔肋的强化传热综合指标达到最大值;随着通道雷诺数的增大,斜孔肋通道的摩擦因数小幅减小,换热则逐渐增强.
[Abstract]:In order to strengthen the heat transfer characteristics of inclined hole rib with large aspect ratio rectangular channel, and to seek the optimum hole inclination angle, adjusting hole inclination angle and channel Reynolds number, which were changed in 0 degrees ~30 and 3 * 10~4~9 * 10~4 range, through the numerical calculation system of channel friction factor and ribbed wall Nusselt number and other parameters. The study found that: compared to the conventional fin model, oblique hole rib can effectively improve the local area adjacent to the rear fin fin of the wall heat transfer, and reduce the friction coefficient of the channel, but the heat transfer enhancement factor decreases with the increase of discharge hole; tilt angle, channel the relative friction factor increases monotonously and the change process of heat transfer enhancement factor showed the first increased and then decreased, there is a row of holes for the optimal tilt angle of 15 degrees, the inclined hole rib reinforcement index reaches the maximum value of heat transfer with the channel; With the increase of Reynolds number, the friction factor of the diagonal ribbed channel decreases slightly, and the heat transfer increases gradually.
【作者单位】：大连理工大学航空航天学院工业装备结构分析国家重点实验室;
【基金】：国家自然科学基金(51206014) 中央高校基本科研业务费专项资助(DUT2014040)
【分类号】：TK124
【正文快照】： 随着涡轮进口温度的不断升高,粗糙肋、射流冲击等单一冷却方式已难以满足燃气轮机热端部件的冷却需要,复合冷却技术成为发展高性能燃气轮机的关键[1-2].肋+冲击作为涡轮叶片一种高效的内部复合冷却技术,目前都是通过喷嘴或者孔板形成射流冲击肋化靶面实现的[3-8],这需要比较大

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