Effects of Roughness Ribs on Flow Patterns of Simplified Aircraft Model
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摘要: 在水洞中应用染色液流动显示技术对某型号飞机简化模型机头流态进行了研究,详细观察了机头两侧粗糙带和"只"字型粗糙带对机头流态的影响.实验结果表明,风洞实验所得力矩曲线受雷诺数影响大的攻角范围与机头涡破裂后打在座舱上的攻角及机头涡在座舱前严重掺混的攻角相联系.水洞实验中,来流速度为20cm/s、粗糙高度为0.8mm时流态随攻角的变化规律可用来解释风洞实验结果中力矩曲线的分散性.Abstract: The dye-injection flow visualization technique has been used to study the flow patterns of a simplified aircraft model, the effects of side roughness ribs and "O" type with side roughness ribs on the flow patterns have been observed in details. The experimental results indicated that the range of the angle of attack influenced by the Reynolds number in the pitching moment curves is related to the angle of attack at which the nose vortex begins to beat the canopy until it mixes in the front of the canopy. In this water tunnel experiments, the results obtained at 20cm/s for the roughness height 0.8mm can be used to explained the scatter of the pitching moment curves obtained in the wind tunnel measurements.
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Key words:
- flow visualization /
- vortex flow /
- separated flow /
- simplified aircraft model /
- roughness ribs
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[1] 王晋军,薛启智,白 涛,等．某型号飞机简化模型大攻角流态初步研究[J]．北京航空航天大学学报,2000,26(2):171~173． [2]王晋军,苗福友,钮珍南,等．雷诺数对三角翼绕流的影响[J]．实验力学,1998,13(4):497~501． [3]Malcolm G N, Nelson R C. Comparison of water and wind tunnel flow visualization results on a generic fighter configuration at high angle of attack . AIAA-87-2423,1987． [4]梅尔兹克奇 W. 流动显示[M]. 黄素逸等译. 北京:科学出版社,1991． -
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