Accession Number : ADA115413

Title :   Coupling Between Velocity Oscillations and Solid Propellant Combustion.

Descriptive Note : Annual rept. 1 Mar 81-28 Feb 82,


Personal Author(s) : Brown,R S ; Waugh,R C

PDF Url : ADA115413

Report Date : Apr 1982

Pagination or Media Count : 23

Abstract : A literature survey of velocity coupling found that existing analytical models do not predict instability reliably. Manifestations of velocity coupling in burners and motors are described in the literature as harmonic content and mean shift in pressure traces and susceptibility to triggering instability by pulsing. Evidence of these phenomena were found in numerous laboratory burners, research motors, and development motors. The motors which exhibited velocity coupling all had a large L/D ration. The severity of instability was found to depend on the propellant composition, grain geometry, nozzle geometry, and propellant conditioning temperature. A cold flow simulated rocket motor with porous walls has been constructed. Oscillatory heat flux at the wall has been measured in this simulated motor while driving pressure oscillations with a rotating valve. (Author)

Descriptors :   *Solid propellant rocket engines, *Combustion stability, *Velocity, *Coupling(Interaction), *Interior ballistics, Guided missiles, Solid rocket propellants, Combustion, Burning rate, Gas flow, Mathematical models, Ratios, Length, Diameters, Chemical composition, Smokeless propellants, Rocket propellant grains, Rocket nozzles, Processing, Temperature

Subject Categories : Combustion and Ignition
      Solid Propellant Rocket Engines
      Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE