Control Forces in Rocket Nozzles Produced by Multiport Gaseous Injection

Abstract

This work is concerned with the optimization of the method by which secondary gas is used to produce side force in rocket nozzles and is part of a series of investigations in which the effects of secondary port area, port location in the main nozzle and the angle between the axes of the main and secondary nozzles have been studied. In this note the merits of using multiport configurations for introducing the secondary gas as compared with using a single port of equivalent area are considered. It is shown that, at a given location for introducing the secondary flow, multiport arrangements of either the radial or parallel type give side forces less than that produced by a single port passing the same secondary mass flow.