Accession Number:

AD0270113

Title:

AN EXPERIMENTAL INVESTIGATION OF LONGITUDINAL COMBUSTION INSTABILITY IN A ROCKET MOTOR USING PREMIXED GASEOUS PROPELLANTS

Descriptive Note:

Corporate Author:

PRINCETON UNIV N J

Personal Author(s):

• PELMAS,R.
• GLASSMAN,I.
• WEBB,M.

Report Date:

1961-12-01

Pagination or Media Count:

1.0

Abstract:

Longitudinal combustion instability in a premixed gaseous propellant rocket motor was studied. The chamber length was varied continuously between 3 and 48 inches. A porous media injection plate was used to approximate uniform one-dimensional propellant injection. A showerhead injector was used to determine the influence of combustion zone recirculation on combustion instability. Two propellant combinations were used, methane 40 O 60 N and H - air. Results, in the form of instability maps, are presented for combination of the propellants and injection schemes. The two existing gas rocket instability driving mechanisms are presented and discussed. The influence of chemical kinetics on the instability seems to be unimportant and the driving mechanism is an oscillating heat transfer to the injector couples with a pressure oscillation in the combustion chamber to produce unstable combustion. Author

Descriptors:

• *COMBUSTION
• *GASEOUS ROCKET PROPELLANTS
• *ROCKET ENGINES
• AIR
• HEAT TRANSFER
• HYDROGEN
• NITROGEN
• OSCILLATION
• OXYGEN
• PITCH(MOTION)
• PRESSURE
• REACTION KINETICS
• STABILITY

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE