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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.28 SNIP: 0.421 CiteScore™: 0.9

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2013005392
pages 275-306

MODELING OF A SHORT ACTION MOTOR DISCHARGING A WEIGHT

Dan Michaels
Faculty of Aerospace Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
Alon Gany
Sylvia and David IA Fine Rocket Propulsion Center and the Aerothermodynamics Lab, Faculty of Aerospace Engineering, Technion – Israel Institute of Technology, Haifa, 3200003, Israel

ABSTRACT

This paper investigates the interior ballistics of a unique concept for short action motors, based on a rocket-type combustion chamber discharging a weight through an exhaust tube. Depending on the overall system requirements, different kinds of propellant and weight may be considered. In the current study a system comprising a granular solid propellant and a solid weight is considered in order to capture the basic mechanisms of the impulse augmentation. A simplified lumped parameters model and a detailed two-phase flow model have been formulated and the fundamental characteristics of the propulsion system have been computed and analyzed. The study reveals that for certain system parameters with a given propellant mass the total impulse as well as the specific impulse may be significantly larger than those generated by a conventional rocket motor. The theoretical parametric investigation provides a good understanding on how different system parameters influence the in-terior ballistics processes, and can provide guidelines to the design of thrusters. Such short action motors may be beneficial for spacecraft and missile station keeping and trajectory correction, applying mini-thrusters of this kind, as well as for separating large space bodies such as missiles/launcher stages, satellites, etc.


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