On the Determination of Optimum Thrust Nozzle of a Given Length for a Flow with Swirl. Numerical Results

摘要

In a previous report with the same title (AD-631313) the theory of optimum thrust nozzls of prescribed length in a flow with swirl around the axis of symmetry was presented. In the present report the formulae for the computation are summarized, the computational procedure is prescribed in some detail and a number of examples are shown. For the swirl the assumption is made that far upstream in the oncoming flow one has a solid body rotation. The results as far as they are of technical interest are summarized in graphs. They show nozzle shapes for different strengths of the initial swirl, and lines of maximum attainable nozzle effectiveness. The presence of swirl increases the nozzle effectiveness but the thrust is somewhat lower, since the swirl reduces the mass flow through the nozzle. The shape of optimum nozzles is nearly independent upon the swirl. (Author)