
Accession Number : AD0834003
Title : INVESTIGATION OF COMBUSTION CHARACTERISTICS OF A BIPHASE ROCKET,
Corporate Author : PURDUE UNIV LAFAYETTE IN JET PROPULSION CENTER
Personal Author(s) : Netzer, D. W. ; Osborn, J. R.
Report Date : APR 1968
Pagination or Media Count : 203
Abstract : An investigation was conducted (a) to test the ability of the PriemHeidmann propellant vaporization model to predict the steadystate operating characteristics of a biphase rocket motor, (b) to determine the validity of the vaporization limited PriemGuentert nonlinear instability model for predicting the magnitude of a pressure disturbance required to initiate combustion instability, and (c) to determine the applicability of the FeilerHeidmann response factor model to biphase propellant systems. The investigation employed biphase propellants (either normal pentane or normal heptane as the fuel and air as the oxidizer) injected into the chamber through coaxial injector elements. Results of the investigation indicated the existence of a 'stability drop size' above which practically all tests were extremely stable and below which the vast majority of tests were spontaneously unstable. The degree of instability increased substantially as the mass mean drop size was decreased. The fuel flow rate and contraction ratio affected the stability although to a lesser degree than the drop size; the degree of instability decreased with increasing contraction ratio and decreasing fuel mass flow rate. (Author)
Descriptors : (*LIQUID PROPELLANT ROCKET ENGINES, COMBUSTION), (*COMBUSTION, STABILITY), COMBUSTION, LIQUID ROCKET FUELS, AIR, VAPORIZATION, DROPS, MATHEMATICAL MODELS, PREDICTIONS, MODEL TESTS, FUEL INJECTORS, PRESSURE, THERMAL ANALYSIS, MATHEMATICAL PREDICTION.
Subject Categories : Combustion and Ignition
Liquid Propellant Rocket Engines
Distribution Statement : APPROVED FOR PUBLIC RELEASE