Accession Number : AD0634986

Title :   NON-STEADY COMBUSTION OF SOLID PROPELLANTS WITH SPECIAL REFERENCE TO ROCKET INSTABILITY.

Descriptive Note : Annual technical rept., 1 Oct 64-30 Sep 65,

Corporate Author : PRINCETON UNIV N J DEPT OF AEROSPACE AND MECHANICAL SCIENCES

Personal Author(s) : Krier, Herman ; di Lauro,Gerald ; Kurylko,Lubomyr ; Summerfield,Martin

Report Date : MAR 1966

Pagination or Media Count : 38

Abstract : A prominent mode of coupling that may drive a solid propellant rocket motor into instability is the interaction between the oscillatory gas dynamic pressure at the burning surface and the instantaneous rate of the oscillatory pressure fluctuations and of rapid monotonic pressure increases are being investigated in a continuing program. Two pieces of apparatus are in use for this purpose. One is the T-tube oscillator. The latter is a chamber with a device to change suddenly on command the throat area of the nozzle to produce pressure rise times of 8,000 psi per second and less. This low range supplements the higher range achievable in the T-tube oscillator. The chamber has three quartz windows which allow luminosity measurements and high speed motion pictures of the propellant flame to be made along with chamber pressure. By varying the chamber volume, and thereby the dp/dt, luminosity versus pressure can be obtained as a function of dp/dt. From this, the temperature is plotted as a function of pressure and dp/dt, and therefore the entropy is plotted as a function of the same variables. The brightness-emissivity method of instantaneous flame temperature measurement is being used. Experiments are being conducted to determine the flame temperature as a function of pressure in various regimes of dp/dt. (Author)

Descriptors :   (*SOLID ROCKET PROPELLANTS, *COMBUSTION), (*SOLID PROPELLANT ROCKET ENGINES, STABILITY, ROCKET NOZZLES, PRESSURE, COMBUSTION CHAMBERS, ENTROPY, FLAMES, BRIGHTNESS, EMISSIVITY

Subject Categories : Solid Propellant Rocket Engines
      Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE