首页> 外文期刊>Journal of enhanced heat transfer >WINGLET-PAIR TARGET SURFACE ROUGHNESS INFLUENCES ON IMPINGEMENT JET ARRAY HEAT TRANSFER
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WINGLET-PAIR TARGET SURFACE ROUGHNESS INFLUENCES ON IMPINGEMENT JET ARRAY HEAT TRANSFER

机译:小翼对目标表面粗糙度对射流射流阵列传热的影响

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摘要

Vortex generator target surface roughness elements, with sizes on the same approximate scale as impingement hole diameter, are utilized within an array along target surfaces employed with impingement jet array cooling. Two different types of vortex generators are used: rectangular winglet pair and delta winglet pair, where of these is utilized with a common flow upward orientation (where the upflow region is located between the two vortices within each induced vortex pair). The impingement plate employed contains round holes, such that holes in adjacent streamwise rows are staggered with respect to each other. The vortex generator target surface results are compared to experimental data obtained with target surfaces with arrays of small triangle roughness elements. The arrays of small triangle roughness are employed with different roughness heights, both with and without the addition of large pin roughness elements. As such, new small triangle roughness data, and new vortex generator roughness data, are provided for different impingement jet Reynolds numbers (based on impingement jet hole diameter) of 9 x 10(2), 15 x 10(2) to 16 x 10(2), 5 x 10(3) to 51 x 10(2), and 11 x 10(3) to 111 x 10(2). Resulting variations in performance are then related to different roughness element arrangements, with different ratios of wetted surface area to flat projected area, as well as to target surface internal conduction, and to the increased three-dimensional transport and mixing produced by arrays of target surface roughness elements.
机译:沿着与冲击射流阵列冷却一起使用的目标表面,在阵列内利用涡旋发生器目标表面粗糙度元件,其尺寸与冲击孔直径的尺寸大致相同。使用了两种不同类型的涡流发生器:矩形小翼对和三角形小翼对,其中的涡流发生器具有共同的向上流动方向(向上流动区域位于每个诱导涡流对内的两个涡旋之间)。所使用的冲击板包含圆形孔,使得相邻的沿流的行中的孔相对于彼此交错。将涡流发生器的目标表面结果与具有小三角形粗糙度元素阵列的目标表面获得的实验数据进行比较。带有或不带有大的销钉粗糙度元件时,采用具有不同粗糙度高度的小三角形粗糙度的阵列。这样,为不同的冲击射流雷诺数(基于冲击射孔直径)提供了9 x 10(2),15 x 10(2)到16 x 10的新小三角形粗糙度数据和新涡流发生器粗糙度数据。 (2),5 x 10(3)至51 x 10(2)和11 x 10(3)至111 x 10(2)。结果导致的性能变化与不同的粗糙度元素排列,润湿的表面积与平坦的投影区域的比率不同以及目标表面的内部传导有关,并与目标表面阵列产生的三维传输和混合增加有关粗糙度元素。

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