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首页> 外文期刊>International Journal of Heat and Mass Transfer >Swirling flow heat transfer and hydrodynamics in the model of blade cyclone cooling with inlet co-swirling flow
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Swirling flow heat transfer and hydrodynamics in the model of blade cyclone cooling with inlet co-swirling flow

机译：旋转流动热传递与流体动力学在刀片式旋风冷却模型中，进气旋流流动

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摘要

Swirling flow heat transfer and hydrodynamics were studied experimentally in the round passage, simulating the blade cyclone cooling. The smooth passage with one- and two inclined-tangential flow supply and the additional co-swirling flow at the inlet is considered. The Reynolds number, based on the average axial speed and passage internal diameter was ranged from 40 000 to 108 000, the co-swirling flow ratio G_d/G_∑ was varied from 0 to 0.23. At G_d/G_∑ ≤ 0.11 in the passage with one tangential slot the co-swirling flow influences weakly on the heat transfer enhancement and pressure drop ratio. In the passage with two slots, the Nu_d/Nu_(d0) ratio drops down immediately from G_d = 0, moreover in this case the heat transfer is about 20% lower than that in the passage with one slot. At the identical total pressure in front of the passage, both schemes are comparable in terms of the total pressure losses. When pressure losses in swirl generators are taken into consideration at G_d = 0 two slots scheme demonstrates a greater Reynolds analogy factor than that for the one slot configuration. Also in terms of this factor, the two slots scheme looks better than the continuous and broken V-shaped ribs commonly used in the internal blade cooling. At G_d/G_∑ > 0.5 - 0.6, the co-swirling flow reduces the heat transfer ratio and Reynolds analogy factor. In the passage with one inlet slot in the limited area of G_d/G_∑ ratio, the pressure losses in the 90° exit bend are lower compared with the axial flow in the bend. In the passage with two slots in the entire range of Reynolds number, these losses are below those if the axial flow exists in the bend. This very attractive feature can be employed in the blade cyclone cooling design when the coolant discharges into the trailing edge area.
机译：在圆形通道中实验研究旋流流动传热和流体动力学，模拟刀片旋风冷却。考虑了具有单个和两个倾斜切向流量的平滑通道和入口处的附加的共旋流量。基于平均轴向速度和通道内径的雷诺数范围为40 000至108000，将共旋流量比G_D /G_σ变化为0至0.23。在G_D /G_Σ≤0.11在通道中，具有一个切向槽的共旋流量对传热增强和压降比弱。在具有两个槽的段落中，Nu_D / Nu_（D0）比立即从G_D = 0下降，此外，在这种情况下，传热比具有一个插槽的通道中的传热大约20％。在通道前面的相同总压力下，两种方案就总压力损耗而相当。当在G_D = 0时考虑旋流发生器中的压力损耗，两个插槽方案演示了比一个插槽配置更大的雷诺比比因子。同样在该因素方面，两个槽方案看起来优于内叶片冷却中的连续和破碎的V形肋。在G_D /G_σ> 0.5 - 0.6处，共旋流量降低了传热比和雷诺比类比。在G_D /G_Σ比的有限区域的一个入口槽的通道中，与弯曲中的轴向流相比，90°出口弯曲中的压力损失较低。在雷诺数的整个范围内有两个槽的通道中，如果弯曲中存在轴向流量，则这些损耗低于那些。当冷却剂排出到后缘区域时，可以在刀片式旋风冷却设计中使用这种非常有吸引力的特征。

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