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首页> 美国政府科技报告 >EFFECTS OF FINENESS RATIO AND REYNOLDS NUMBER ON THE LOW-SPEED CROSSWIND DRAG CHARACTERISTICS OF CIRCULAR AND MODIFIED-SQUARE CYLINDERS
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EFFECTS OF FINENESS RATIO AND REYNOLDS NUMBER ON THE LOW-SPEED CROSSWIND DRAG CHARACTERISTICS OF CIRCULAR AND MODIFIED-SQUARE CYLINDERS

机译：强度比和雷诺数对圆形和改进方圆柱低速横向拖曳特性的影响

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摘要

A wind-tunnel investigation has been made on modified-square and circular cylinders to determine the effects of fineness ratio and Reynolds numbers on the crosswind drag characteristics. Fineness ratios from 2 to 14 were investigated over a Reynolds number range from approxi¬mately 300,000 to 1,650,000 which corresponded to Mach numbers from 0.057 to 0.377. The results of the investigation show that at supercritical Reynolds numbers the drag coefficient of the circular cylinder increases with increasing Reynolds number for all fineness ratios but at low fineness ratios this effect Is considerably less than at higher fineness ratios. For circular cylinders in the high fineness-ratio range there is a deduction in drag as the fineness ratio is decreased except for Reynolds numbers of 900,000 and 1,000,000, whereas at low fineness ratios the opposite trend generally occurs. The addition of hemispheri¬cal ends to the circular cylinder gave a substantial decrease in drag at a fineness ratio of 3.27 but the effect was negligible at fineness ratios of 5-27 and 10. The finite-length modified-square cylinder gave a reduction in drag over the two-dimensional modified-square cylinder for the complete range of test Reynolds numbers with the lowest fine¬ness ratio giving the lowest drag at Reynolds numbers above 300,000.

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  • 作者

    Linwood W. McKinney;

  • 作者单位
  • 年度 1960
  • 页码 1-17
  • 总页数 17
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工业技术;
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