Accession Number:

AD0758890

Title:

Instability and Noise Generation in Air-Breathing Propulsion Systems.

Descriptive Note:

Interim progress rept. 1 Jun 71-31 May 72,

Corporate Author:

ULTRASYSTEMS INC IRVINE CALIF

Personal Author(s):

Report Date:

1973-01-01

Pagination or Media Count:

47.0

Abstract:

The report presents the progress of research accomplished on instability and noise generation in airbreathing propulsion systems during the period 1 Jun 1971 to 31 May 1972. During this period the focus has been on the theoretical delineation of various possible afterburner instability mechanisms. A literature review was made of other investigations of mechanisms whereby energy is pumped from the combustion process into a standing or traveling wave system within the combustor cavity. A theoretical analysis was initiated based on a periodic vortex shedding model. It is hypothesized in this model that vorticity is shed in an oscillatory manner from the flame holder at a frequency consistent with the cavity resonance. Author Modified Abstract

Subject Categories:

  • Combustion and Ignition
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE