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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat/mass transfer over the plane tip equipped with a full coverage winglet in a turbine cascade: Part 2 - Tip surface data
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Heat/mass transfer over the plane tip equipped with a full coverage winglet in a turbine cascade: Part 2 - Tip surface data

机译：涡轮叶栅中配备有全覆盖小翼的平面尖端的热/质量传递：第2部分-尖端表面数据

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摘要

The effects of h/s (tip gap height-to-span ratio) on heat/mass transfer on the plane (flat) tip surface of a full coverage (FC) winglet have been investigated by employing the naphthalene sublimation technique along with oil film flow visualizations. For a winglet width-to-pitch ratio of w/p = 10.55%, the tip gap is widely changed to be h/s = 0.68%, 1.02%, 1.36%, 1.70% and 2.04%. The result shows that regardless of h/s, local heat/mass transfer rate on the tip surface is very high on the protruding winglet top surface at the leading edge and on the pressure side. On the other hand, there is relatively low local heat/mass transfer rate on the protruding winglet top surface on the suction side as well as in an area behind the leading edge separation bubble. The tip surface inside the baseline blade profile with the FC winglet is exposed to much less severe thermal load than the baseline plane tip surface with no winglet, whereas total thermal load on the protruding FC winglet is more severe than thermal load on the baseline plane tip surface with no winglet.
机译：通过使用萘升华技术和油膜，研究了h / s（尖端间隙高宽比）对全覆盖（FC）小翼的平面（平坦）尖端表面上的热/质量传递的影响。流可视化。对于小翼宽度与节距的比率w / p = 10.55％，叶尖间隙被广泛更改为h / s = 0.68％，1.02％，1.36％，1.70％和2.04％。结果表明，不管h / s，尖端表面上的局部热量/质量传递速率在前缘和压力侧的突出小翼顶表面上都非常高。另一方面，在吸入侧的突出的小翼顶表面上以及在前缘分离气泡后面的区域中，存在相对较低的局部传热/传质速率。与没有小翼的基线平面尖端表面相比，带有FC小翼的基线叶片轮廓内部的尖端表面承受的热负荷要少得多，而突出的FC小翼上的总热负荷要比基线平面尖端上的热负荷严重得多。没有小翼的表面。

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