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本文使用瞬态测量技术对球型/椭球型凹陷冷却结构内的流阻性能和局部传热性能进行了实验研究。凹陷深度与通道高度之比为0 2,凹陷投影赢径与通道高度的比为1。冷却通道的高度为10 mm,基于通道水利直径和平均速度的雷诺数为8500~51000。实验结果表明,充分发展段的球型凹陷的传热性能是光滑通道传热性能的1.45~1.55倍,而其摩擦因子是光滑通道摩擦因子的1.25~1.75倍;椭球型凹陷的传热性能比球型凹陷低4%~15%,摩擦因子高5%左右。本实验研究获得了球形凹陷/椭球型凹陷详细的局部传热性能分布,凹陷后半部分的传热性能明显高于凹陷前半部分的传热性能。球型凹陷的总体热性能参数比椭球型凹陷高约14%。
In this paper, transient measurement techniques were used to experimentally study the flow resistance and local heat transfer performance in a spherical / ellipsoidal cooling structure. The ratio of the depth of depression to the height of channel is 0 2, and the ratio of the height of depression projection to the height of channel is 1. The cooling channel height is 10 mm, and the Reynolds number is 8500 ~ 51000 based on the channel water diameter and average speed. The experimental results show that the heat transfer performance of the ball-shaped depression in the fully developed section is 1.45-1.55 times that of the smooth passage, and its friction factor is 1.25-1.75 times that of the smooth passage. The heat transfer performance of the ellipsoidal depression 4% to 15% lower than the spherical depression, and the friction factor is about 5% higher. The experimental study obtained the detailed local heat transfer performance distribution of the spherical depression / ellipsoidal depression, the heat transfer performance of the latter half of the depression was obviously higher than the heat transfer performance of the first half of the depression. The global thermal performance parameters of the spherical depression are about 14% higher than that of the ellipsoidal depression.