Study on the Removal of the Harmful Drag by Controlling the Interference of Boundary-Layer Flows

控制边界层流干扰去除有害阻力的研究

• 批准号: 14550139
• 负责人: WATANABE Hideo
• 金额: $ 2.05万
• 依托单位: Miyakonojo National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550139/
• 关键词: Boundary Layer; Interacting Flow; Lift and Drag; Aerotrain; Axial-Flow Fan; Fillet; Grand Effect; Circular Cylinder

1.Aerotrain is a new type vehicle under development by us, which applies a wing-in-ground effect. It has vertical side wings at the tips of main wings arranged in tandem to regulate automatically its lateral position in a guide way by the wing-in-ground effect between the side wing and the side wall. We performed a series of experiments to improve the performance of Aerotrain by controlling side-wing/wing interaction. Attaching a fillet in the sharp corner of the side-wing/wing combination model, we could considerably improve the aerodynamic characteristics of the model, that is, the drag of the model was decreased and the lift was increased remarkably. As for the lift, the effect of the fillet could be evaluated by separating it from the ground effect.2.Using a double chamber type small wind tunnel, we conducted an experiment with a small axial-flow fan to improve its performance. When installing a bell mouse on the suction side of the fan, the condition of the inlet flow was improved and the efficiency of the fen rose substantially. But, guide vanes which were installed in the exit of the impeller improved the performance too much.3.Fluid-force characteristics of a circular cylinder (a main cylinder) affected by a smaller one (a subcylinder) in close proximity to it were studied experimentally. The relative position of both cylinder changed pressure distribution on the main cylinder and its drag coefficient remarkably. Especially, the effect was very large when the subcylinder was put near the front of the main cylinder. Sometimes, large lift force was produced by the interaction with two cylinders. These mechanisms were made clear by visualizing the flow around two cylinders with a smoke-wire method.

1.Aerotrain是我们正在开发的一种新型车辆，采用翼地效应。它的主翼顶端有垂直的侧翼，串联排列，通过侧翼与侧壁之间的翼入地效应，自动调节其横向位置。我们进行了一系列实验，通过控制侧翼/机翼相互作用来提高 Aerotrain 的性能。在侧翼/机翼组合模型的尖角处附加圆角，可以显着改善模型的气动特性，即模型的阻力减小，升力显着增加。对于升力，可以通过将圆角效应与地面效应分开来评价圆角效应。2.利用双室式小型风洞，对小型轴流风机进行了实验，以提高其性能。在风机吸入侧安装钟鼠后，进口气流状况得到改善，风机效率大幅提高。但是，安装在叶轮出口处的导叶对性能的提高太大了。3.实验研究了靠近其附近的较小圆柱体(子圆柱体)影响的圆柱体(主圆柱体)的流体力特性。两缸的相对位置显着改变了主缸的压力分布及其阻力系数。尤其是当副缸靠近主缸前部放置时，效果非常大。有时，两个气缸相互作用会产生很大的升力。通过使用烟线法可视化两个气缸周围的流动，可以清楚地了解这些机制。

项目成果

Wing-wing Flow Interaction of the Aero-Train,

航空列车的翼翼流相互作用，

• 发表时间: 2003
• 期刊: The 2003 Division of Fluid Dynamics Annual Meeting,Nov.23-25,2003,New Jersey,USA.
• 作者: Dong-hee Yoon;Yasuaki Kohama;Takuma Kato
• 通讯作者: Takuma Kato

Improvement in Performance of Aerotrain by Controlling Side-Wing/Wing Interaction

通过控制侧翼/机翼相互作用提高航空列车的性能

• 发表时间: 2003
• 期刊: Trans.Jpn.Soc.Mech.Eng.(in Japanese) 69-686
• 作者: H.Watanabe;F.Ohta;S.Kikuchi;Y.Kohama
• 通讯作者: Y.Kohama

加藤琢真, 伊藤靖, 中橋和弘, 菊地聡, 小濱泰昭: "エアロトレインの空力解析について"日本流体力学会年会2002講演論文集. 108-109 (2002)

Takuma Kato、Yasushi Ito、Kazuhiro Nakahashi、Satoshi Kikuchi、Yasuaki Kohama：“关于航空列车的空气动力学分析”日本流体力学学会年会 2002 年会议记录。108-109 (2002)

Improvement of the Aerotrain Aerodynamic Performance by Controlling Wing Interactions

通过控制机翼相互作用改善航空列车气动性能

• 发表时间: 2004
• 期刊: Trans.Jpn.Soc.Mech.Eng.(in Japanese) 70-694
• 作者: D.Yoon;H.Watanabe;Y.Kohama;S.Kikuchi
• 通讯作者: S.Kikuchi

Wing-wing Flow Interaction of the Aero-Train

航空列车的翼翼流相互作用

• 发表时间: 2003
• 期刊: The 2003 Division of Fluid Dynamics Annual Meeting, Nov.23-25,2003,New Jersey, USA
• 作者: D.Yoon;Y.Kohama;T.Kato
• 通讯作者: T.Kato