日本航空宇宙学会論文集
Online ISSN : 2432-3691
Print ISSN : 1344-6460
ISSN-L : 1344-6460
大迎角を持つ軸対称放物体背後に生じる剥離渦の非定常特性の解明
石出 忠輝西川 進栄三神 史彦
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2000 年 48 巻 562 号 p. 377-384

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The phenomenon of three-dimensional separation of the flow over a slender body at high angles of attack is difficult to model and still challenging problem. The singularity of the flow is caused by mutual intervention of threedimensional separation and separated vortices. In this study, the flow in the cross-flow separation region of an axisymmetric paraboloid at 30, 40, and 50deg angle of attack has been investigated experimentally by hot wire anemometer. Reynolds numbers are 9.0×103 and 1.8×104 referred to the base diameter. X-type probe was used to measure three dimensional velocity fluctuations over the axisymmetric paraboloid at sampling time of 4kHz. It has been shown that the lift-off and mergence of vortices can be explained by r.m.s. distribution of velocity fluctuations. Reynolds stress and the difference between probability density function and normal distribution oscillates where the kink of vortex is observed.

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© The Japan Society for Aeronautical and Space Sciences
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