Aerodynamic forces and moments on an ogive cylinder at incidence

Abstract

In flows over an ogive cylinder placed at incidence, it is well documented that a side force acts on the cylinder. However, little is known about the relation between the side force (CFy) and other force and moment components. In this note, the variations of three force and three moment components, acting on the ogive cylinder, with roll angle are measured simultaneously. The model was placed at four different angles-of-attack, namely α = 30°, 45°, 50° and 60° and the results show that in addition to CFy, the variation of CFz, CMx, and CMz with the roll angle also exhibit the square wave like behaviour at α = 45° and 50°, and with the same cross over ø positions, while CFx and CMy remain relatively constant irrespective of the roll angle. The magnitudes of CFx and C My were found to increase with angle of attack and were thought to be due to the increase in normal frontal area.