Pressure around a 20-degree Circular Cone at 35-degree Angle of Attack and Low Speed

摘要

This paper reports results from comprehensive pressure measurements of a circular cone-cylinder model in a low-turbulence 3 0 x 1,6 m low-speed wind tunnel. The semi-apex angle of the cone is 10°. The results consist of detailed pressure distributions over nine stations on the cone at 35° angle of attack and Reynolds number of 0 9 x 106 based on the diameter of the cone base. The tests encompassed a complete coverage of roll angles in 9° intervals. The test conditions are chosen to be the same as those of a known test in the literature for validation purpose. Local and overall forces and moments are calculated from the measured pressures. The variation of local side-force coefficient normalized by the local diameter of the cone, with roll angle is nearly a square-wave curve. The primary state of the boundary layer is inferred from the measured pressures to study the origin of asymmetries. The association of local side force with a characteristic pressure at a given pressure station is shown independent of roll angle for various local side force and various pressure measuring stations. The conicity of the flow is examined. The complete measured pressures are documented in the Appendix for public use.