
Accession Number : AD0691852
Title : ATTITUDE STABILIZATION USING A ROTATING PLUG NOZZLE.
Descriptive Note : Final rept. 1 Jan30 Jun 69,
Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE AEROPHYSICS LAB
Personal Author(s) : Draim,John E.
Report Date : JUL 1969
Pagination or Media Count : 84
Abstract : A modified plug nozzle in which the plug is spinning as a gyroscopic mass is investigated. It is postulated that exhaust gas flow is modulated between the plug and the rocket casing in such a manner as to provide a stabilizing moment around the rocket center of gravity, when the rocket longitudinal axis deviates from the plugspin axis. Lagrange equations of motion are formulated for the dynamical system described by four generalized coordinates. These equations are mechanized in an analog computer to yield plots of rocket angular motions. Critical nondimensional parameters for the system are identified and discussed. A small demonstrator model was designed, constructed and tested, first with a smooth conical plug, and then with a conical plug having indented turning slots in the area of the exhaust annulus. Tests conducted on the model demonstrated that sufficient gyroscopic rigidity can be generated to counter the unbalanced pressure field effects around the rotating plug. (Author)
Descriptors : (*ROCKETS, SPIN STABILIZATION), (*PLUG NOZZLES, STABILIZATION SYSTEMS), ROCKET NOZZLES, CONICAL BODIES, SPINNING(MOTION), STABILIZATION, NOZZLE GAS FLOW, MODULATION, EQUATIONS OF MOTION, THESES
Subject Categories : Rockets
Fluid Mechanics
Rocket Engines
Distribution Statement : APPROVED FOR PUBLIC RELEASE