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Experimental Investigation of Three Rotating Parachutes

机译:三种旋转降落伞的实验研究

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摘要

From the experimental results obtained and the observations made, these conclusions are reached: 1) Although having the same canopy surface area S_(ref), all configurations possess different aerodynamic properties due to their different canopy shapes. 2) Although their spin rate results are not very different from cross configurations, the tangential force coefficient results of the round configurations are usually larger than those of the cross configurations. During the tests, only the suspension line length of the round parachute was changed. There are also other parameters which can be studied with this parachute, such as the jet opening area and the gore geometry. 3) From the dynamic stability observation results, it is realized that the oscillations of the rotating cross configurations from their symmetry axes are less than the oscillations of their nonrotating configurations. Furthermore, the oscillation of the round parachute is usually higher than that of each rotating cross parachute. 4) The cross parachutes tested are very similar to those considered by Z. Shpund and D. Levin, Although there are differences in the setups and the test conditions, some values are close to each other. Furthermore, the trends found are usually observed in the previous studies.
机译:从获得的实验结果和观察到的结论,可以得出以下结论:1)尽管具有相同的顶篷表面积S_(ref),但所有配置由于其不同的顶篷形状而具有不同的空气动力学特性。 2)尽管它们的旋转速率结果与十字形配置没有很大差异,但圆形轮廓的切向力系数结果通常大于十字形。在测试期间,仅改变了圆形降落伞的悬挂线长度。降落伞还可以研究其他参数,例如射流口面积和孔的几何形状。 3)从动态稳定性观察结果可以看出,旋转十字构型从其对称轴的振动小于其非旋转构型的振动。此外,圆形降落伞的振荡通常高于每个旋转交叉降落伞的振荡。 4)测试的降落伞与Z. Shpund和D. Levin所考虑的降落伞非常相似,尽管设置和测试条件有所不同,但有些值彼此接近。此外,发现的趋势通常在以前的研究中观察到。

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