Passive Drag Reduction of Wall-Turbulent Flows

壁湍流的被动减阻

• 批准号: 61460076
• 负责人: TSUGE Shunichi
• 金额: $ 3.78万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460076/
• 关键词: passive drag reduction; turbulence; レイノルズストレス; 受動制御; トムス効果; リブレット; 受動的表面効果; タテ渦抑制; トムズ効果; 纎毛

The objective of the project is to develop a devise effective for passive drag reduction of wall-turbulent flows. For this purpose two models are proposed to simulate roles of polymers which plays important roles in drag reduction known as Toms' effect. The first model is fine fibre-filament deposited on a flat plate by means of electrostatic method. The drag of the 'woolly' flat plate is measured by a specially designed apparatus using a ballancing method which edtects minute drag force as slight streamwise displacement. The measurements show, however, no drag reduction for the model because of difficulty in obtaining fibre filament fine enough to meet the purpose. The second model is then tested which consists of fishing lines placed on a flat plate and alligned in streamwise direction. For optimum configuration the drag reduction of about 7 % is observed. The height of protuberance for this case turns out to be much smaller than the riblets case.

本计画的目的是发展一种有效的壁面紊流被动减阻装置。为此，提出了两种模型来模拟聚合物的作用，在减阻中起着重要作用，称为汤姆斯效应。第一种模型是静电沉积在平板上的细纤维丝。“羊毛状”平板的阻力是通过专门设计的装置使用平衡方法测量的，该方法将微小的阻力检测为轻微的流向位移。然而，测量结果表明，由于难以获得足够细的纤维丝以满足目的，模型没有阻力减少。第二个模型，然后进行测试，其中包括放置在一个平板上的钓鱼线和aligned在流向方向。对于最佳构型，观察到约7%的阻力减小。这种情况下的突起的高度比肋的情况下要小得多。

项目成果

Yasukata TSUTSU and Shunichi TSUGE: "Passive Drag Reduction of Wall-Turbulent Flows" KikaiGakkai Ronbun-shu B.

Yasukata TSUTSU 和 Shunichi TSUGE：“壁面湍流的被动减阻” KikaiGakkai Ronbun-shu B.

筒井康賢, 柘植俊一: 機械学会論文集"B.

Yasutaka Tsutsui、Shunichi Tsuge：日本机械工程师学会会议记录“B.