Investigations for Flow Around slender bodies at high angles of attack

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Investigations for flow around the slender bodies at high angles of attack and the related aerodynamic characteristics are carried out with the use of both the flow visualization/force measurements in the low speed wind tunnel and the numerical simulation.The major conclusions are as follows:1. Flow around the axisymmetric bodies shows the asymmetries at angles of attack of 60-75 deg and it causes the asymmetric side force.2. The empirical law that "the nonlinear aerodynamic characteristics appears at angle of attack as approximately twice as cone angle of body" which is effective to axisymmetric body can be also applied to the non-axisymmetric bodies.3. When the foreplane is attached on the slender body, it somewhat alleviates the occurrence of asymmetric side force and demonstrates the possibility of application to lateral control of space transportation system.4. Flow structure and aerodynamic characteristics can be simulated in some extent with the Navier-Stokes analysis. The structures of the three-dimensional separated flow (nodes, foci, saddles, etc.) can be numerically obtained based on the computational results of Navier-Stokes equations.