用波纹管在矩形管道中减少阻力

IF 1.4 4区工程技术 Q2 ENGINEERING, AEROSPACE

Aeronautical Journal Pub Date : 1995-05-01 DOI:10.1017/S0001924000028360

A. R. Moore, M. V. Lowson

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引用次数: 9

摘要

摘要对宽高比为10的矩形管道中波纹对阻力的影响进行了实验研究。已经发现，在完全发展的湍流中，最大阻力减少约为10%。这个数字比通常在外部流动中发现的6-8%的阻力减少要大。当波纹管高度在7 ~ 13个壁单元之间时，阻力减小最大。对流动发展区域的分析表明，在壁面单位值为13时，最大阻力减少约8%，与外部流动的结果一致。研究了细纹对跃迁的影响。结果表明，在临界雷诺数下，波纹使相变延迟了2-4%，并使相变过程的长度有所延长，使相变完成延迟了4-8%，且在较低雷诺数下影响更大。

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Drag reduction in a rectangular duct using riblets

Abstract An experimental investigation has been made into the effects of riblets on the drag in a rectangular duct of aspect ratio 10. It has been found that a maximum drag reduction of approximately 10% occurs in fully developed turbulent flow. This figure is larger than the 6–8% drag reduction usually found for external flow. The maximum drag reduction occurred when the height of the riblets was between 7 and 13 wall units. Analysis of the developing region of the flow has shown a maximum drag reduction of approximately 8% at a wall unit value of 13, consistent with results in external flows. The effects of riblets on transition has also been investigated. It was found that riblets delayed transition by 2–4% in critical Re as measured by peak flatness, and caused some extension in the length of the transition process, so that the completion of transition was delayed by between 4–8%, with the stronger effect at the lower Reynolds numbers.

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来源期刊

Aeronautical Journal 工程技术-工程：宇航

CiteScore

3.70

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： The Aeronautical Journal contains original papers on all aspects of research, design and development, construction and operation of aircraft and space vehicles. Papers are therefore solicited on all aspects of research, design and development, construction and operation of aircraft and space vehicles. Papers are also welcomed which review, comprehensively, the results of recent research developments in any of the above topics.