Abstract
Until recently, in constructing optimum supersonic axisymmetric nozzles, gas motions without rotation about the axis have been considered. This question has been studied rather completely for equilibrium gas flows in [1–6]. Avoidance of flow rotation is a limitation which may reduce the nozzle thrust, other conditions being equal. It is easy to show that for zero nozzle length or for a length that permits obtaining uniform flow at the exist that maximum thrust is provided by uniform flow parallel to the nozzle axis. If the length limitation does not make it possible to do this, then the use of freedom in the gas rotation may increase the nozzle thrust. Using a very simple example it is shown that this possibility is realized.
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