Effect of Ground Surface Patterns on Aeroflie Lift in the close proximity to the Ground

地表形态对靠近地面的飞机升力的影响

• 批准号: 14550155
• 负责人: KIKUCHI Masanori
• 金额: $ 2.18万
• 依托单位: University of Miyazaki
• 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 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550155/
• 关键词: New Transport System; Ground Effects; Towing Wing Tunnel; Tam Pressure; Strong Interference Flows; Boundary Layer; Aerofoil Section

The lift of aerofoil in the ground effect increases, because the ram pressure between the aerofoil and the ground is strengthen. The width of the wing is limited, the ram pressure decreases gradually to zero at the end of the wing. To keep the ram pressure at high level, we proposed the new system which has surface pattern on the ground, which prevents the air to flow the sideways. It has several longitudinal fences on the ground surface.The aerofoil flying in the close proximity to the ground is strongly affected by the ground through fluid viscosity. The conventional wind tunnel can not estimate the aerodynamic characteristics of the aerofoil near the wind tunnel wall, because the aerofoil does not run relative to the wall. So, it is necessary to run the aerofoil relative to the ground. We. designed a system in which the wing rotates about the axis of the circular disk whose height is precisely controlled by the stepping motor. The wing section is NACA4412, chord length 100mm, width 200mm, the outer diameter of the rotating wing is 1000mm. Inner diameter of the circular disk is 600mm and outer diameter is 1000mm.The longitudinal hence on the ground has 2mm height of papers. The distance between neighboring hence is 1cm. When the height of the wing trailing edge is less the 20% of the chord length, the lift force increase and the tendency is strong, the attack angle decrease to the lower surface of the wing is parallel to the ground.

地面效应时机翼的升力增大，是由于机翼与地面之间的冲压压力增大。机翼的宽度是有限的，冲压压力逐渐减少到零，在机翼的末端。为了保持较高的冲压压力，我们提出了一种新的系统，该系统在地面上具有表面图案，以防止空气侧向流动。它在地面上有几个纵向的栅栏，在贴近地面飞行的机翼通过流体粘性强烈地受到地面的影响。常规风洞无法估算翼型在洞壁附近的气动特性，因为翼型不相对洞壁运动。因此，有必要使机翼相对于地面运动。We.设计了一种由步进电机精确控制机翼绕圆盘轴旋转的系统。机翼截面为NACA4412，弦长100mm，宽200mm，旋转翼外径1000mm。圆盘的内径为600mm，外径为1000mm，因此在地面上纵向有2mm高的纸张。因此，相邻的距离是1厘米。当机翼后缘高度小于弦长的20%时，升力增大且趋势较强，迎角减小至机翼下表面平行于地面。

项目成果

菊地正憲: "地面近傍を走行する翼型の空力特性に及ぼす反り形状の影響"日本機会学会九州支部講演論文集. No.048-1. 269-270 (2004)

Masanori Kikuchi：“翘曲形状对近地运行翼型的空气动力学特性的影响”日本机械工程师学会九州分会会议记录第 048-270 号（2004 年）。

高橋勇二: "境界層近似を用いた地面効果翼の空力特性の解析"日本機会学会九州支部講演論文集. No.048-1. 267-268 (2004)

高桥雄二：“利用边界层近似分析地面效应机翼的空气动力特性”日本机械工程学会九州分会论文集No.048-268（2004）。

弓削俊夫: "曳航方式によるWIGの空力特性計測装置の開発"宮崎大学工学部紀要. 31. 263-271 (2002)

Toshio Yuge：“使用拖曳法开发地效翼机空气动力特性测量装置”宫崎大学工学部通报31. 263-271 (2002)。

M.Kikuchi, K.Hirano, T.Yuge, K.Iseri, Y.Kohama: "Measurement of aerofoil characteristics by method of towing model"Transactions of the JSME. (B)68-676. 3378-3385 (2002)

M.Kikuchi、K.Hirano、T.Yuge、K.Iseri、Y.Kohama：“通过拖曳模型方法测量机翼特性”JSME 汇刊。

菊地正憲: "翼の空力特性に及ぼす地面文様の影響"日本機会学会九州支部講演論文集. No.048-1. 271-272 (2004)

Masanori Kikuchi：“地面图案对机翼空气动力特性的影响”日本机械工程师学会九州分会论文集第 048-1 号（2004 年）。