Accession Number : AD0478042

Title :   A STUDY OF SYSTEM COUPLED INSTABILITY ANALYSIS TECHNIQUES.

Descriptive Note : Quarterly technical rept. no. 3, Nov 65-Jan 66,

Corporate Author : MARTIN CO DENVER COLO

Personal Author(s) : Bikle ,F. E. ; Fidler ,L. E. ; Rohrs,J. B.

Report Date : FEB 1966

Pagination or Media Count : 67

Abstract : Research is presented on the subject of coupled structural/propulsion system instability generally referred to as POGO. The prime objective of the study is to determine the feasibility of using small-scale test configurations to define the parameters critically affecting stability. Both the liquid system pogo experienced on Thor and Titan vehicles are discussed as well as the gas system pogo experienced on Atlas vehicles. Sub-scale test methods and configurations are presented with an analysis of physical generation of cavitation compliance in turbo-pumps. Preliminary test results indicate that inexpensive commercial turbo-pumps can be used effectively to study cavitation phenomenon in rocket-engine propulsion systems. System excitation by oscillation of the pump assembly is accompanied by a high noise content in the system response. A comparison with a piston pulser in the discharge line is considered. (Author)

Descriptors :   (*LIQUID PROPELLANT ROCKET ENGINES, STABILITY), SCALE, MODEL TESTS, OSCILLATION, TURBOPUMPS, CAVITATION, CAVITATION NOISE, EXCITATION, DETERMINATION, COMBUSTION, ENGINE SURGE, AIRFRAMES, TEST METHODS, FLOWMETERS, FLUID FLOW, GAS FLOW, PRESSURIZATION, VIBRATION, DAMPING, LAUNCH VEHICLES

Subject Categories : Liquid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE