Abstract
In order to design the natural laminar flow nose for the high Reynolds number condition suppressing the increase of pressure drag, “local” and “non-axisymmetric” deformation is applied to a base shape. Through the analysis for low Reynolds number cases, it is confirmed that the localized deformation suppresses the increase of pressure drag, and that non-axisymmetric deformation reduces pressure gradient in the azimuthal direction effectively in order to extend the laminar region. It is also shown that there is a capability of more extension of the natural laminar flow effect to the high Reynolds number condition corresponding to the real civil supersonic transport suppressing the increase of pressure drag.
