Shaping an Axisymmetric Body for Reducing Viscous Resistance with the Use of Influence Function

Abstract

An attempt to obtain influence functions is described. These functions show the relationships between the change in shape of a body of revolution and the variation of frictional resistance, viscous pressure resistance, respectively. For this purpose an integral method of higher order boundary layer theory is applied. For reducing viscous resistance, a procedure reforming body shape besed on these influence functions is proposed. The results of calculation show if the body is subjected to a constant volume, optimum shape has a concave part near the tail whether the initial shape does or not. If the body is subjected to a constant volume and maximum diameter, optimum shape has a parallel part whether the initial shape does or not.