Nose shape effect on the visualized flow field around an axisymmetric body of revolution at incidence

The flow over an axisymmetric body of revolution at incidence angle is investigated to explore the nature of complex vortical flow structures around it. The crossflow pressure gradient causes the separated sheet to rollup and extend to the flow at the leeward side of the body. The oil and smoke flow visualization techniques are conducted to explore and describe such complicated flow patterns over and around the axisymmetric body under investigation considering two different nose shapes. The results show the formation of primary and secondary crossflow vortices around the model surface. Furthermore, the effects of nose shape on the vortical flow structure and separation and reattachment locations are also investigated. Moreover, longitudinal and circumferential surface pressure measurements are conducted to further explain the nature of the separation pattern observed in the flow visualization experiments. The comparison of the surface flow visualization results for the model indicates that the nose curvature has influenced on the separation position along the model length. Moreover, the nose separation occurs in smaller incidence angles for the model with blunter nose shape.