| Abstract: | A large number of studies have been published which define bodies of minimal drag and nozzles of maximal thrust. A study has been made of the region of existence of the various solutions in planar flow, and it has been shown that the optimal profile in the presence of a length limitation may have a blunt end, which is a segment of a boundary extremum. The results of these studies and also the required bibiliography are contained in 1–3].In the following we present a joint solution of the problems of constructing the optimal afterbody and nozzle contour, which are the boundaries of a single planar body or of a ducted body. The investigation is limited to cases in which the form of the external contour (i.e., the afterbody contour) ensures the absence of shock waves in its influence region. The necessary conditions are obtained which determine the optimal configuration, and computational examples are given. |
