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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Rib Spacing Effect on Heat Transfer in Rotating Two-Pass Ribbed Channel (AR = 1:2)
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Rib Spacing Effect on Heat Transfer in Rotating Two-Pass Ribbed Channel (AR = 1:2)

机译：肋间距对旋转两通肋通道中传热的影响（AR = 1：2）

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摘要

Rib turbulators are commonly used to enhance the heat transfer within internal cooling passages of advanced gas turbine blades. Many factors affect the thermal performance of a cooling channel with ribs. This study experimentally investigates the effect of rib spacing on the heat transfer enhancement, pressure penalty, and thus the overall thermal performance in both rotating and nonrotating rectangular, cooling channels. In the 1:2 rectangular channels, 45 deg angled ribs are placed on the leading and trailing surfaces. The pitch of the ribs varies, so rib pitch-to-height (P/e) ratios of 10, 7.5, 5, and 3 are considered. Square ribs with a 1.59 mm x 1.59 mm cross section are used for all rib spacing, so the height-to-hydraulic diameter (e/D_h) ratio remains constant at 0.094. With a constant rotational speed of 550 rpm and the Reynolds number ranging from 5000 to 40,000, the rotation number in turn varies from 0.2 to 0.02. Because the skewed turbulators induce secondary flow along the length of the rib, the very close rib spacing of P/e = 3 has the best thermal performance in both rotating and nonrotating channels. This close spacing yields the greatest heat transfer enhancement, whereas the P/e = 5 spacing has the greatest pressure penalty. In addition, the effect of rotation is more pronounced in the channel with the rib spacing of 3. As more ribs are added, the channel is approaching a smooth channel, and the strength of the rotation induced vortices increases.
机译：肋湍流器通常用于增强高级燃气涡轮叶片的内部冷却通道内的热传递。许多因素影响带有肋的冷却通道的热性能。这项研究通过实验研究了肋间距对传热增强，压力损失以及旋转和非旋转矩形冷却通道的整体热性能的影响。在1：2矩形通道中，前表面和后表面上均设有45度成角度的肋。肋的间距变化，因此考虑肋的高度与高度（P / e）之比为10、7.5、5和3。所有肋骨间距均使用横截面为1.59 mm x 1.59 mm的方形肋骨，因此高度与液压直径（e / D_h）的比率保持恒定为0.094。在550 rpm的恒定转速和雷诺数为5000到40,000的情况下，转数又在0.2到0.02之间变化。由于倾斜的湍流器沿肋的长度引起二次流动，因此非常接近的肋间距P / e = 3在旋转和非旋转通道中都具有最佳的热性能。这个紧密的间距产生最大的热传递增强，而P / e = 5间距具有最大的压力损失。此外，在肋间距为3的通道中，旋转的影响更加明显。随着添加更多的肋，通道接近平滑的通道，并且旋转引起的涡流强度增加。

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