Clarification of Unsteady Characteristics in Separated Flow over Axisymmetric Paraboloid at High Angles of Attack.

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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 9.0×10<SUP>3</SUP> and 1.8×10<SUP>4</SUP> 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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