Geometric and Aerodynamic Design of the Nozzle to Add the Blast Tube

An existing solution for using tactical solid fuel rockets for space purposes is to add a blast tube to the nozzle. Equipping the nozzle with a blast tube, in addition to creating space to add the required subsystems, also makes it easier to stabilize and control the system. To get the best performance from a nozzle, various changes must be made to the nozzle structure.In the present study, the existing nozzle is first analyzed from a geometric and aerodynamic point of view using numerical solution in order to achieve performance and efficiency. Then in order to add the blast tube, two new geometries of the mentioned nozzle are designed and according to the prevailing conditions, the changes in velocity, pressure and temperature of the flow through the nozzle have been studied. The results show that the addition of blast tube causes a decrease in total pressure of less than 2%, which is acceptable considering the benefits obtained.