Accession Number : ADP004526

Title :   Nonlinear Interactions between Vortices and Acoustic Waves in a Rocket Combustion Chamber,

Corporate Author : UTAH UNIV SALT LAKE CITY

Personal Author(s) : Flandro,G. A. ; Finlayson,P. A.

Report Date : OCT 1984

Pagination or Media Count : 11

Abstract : In order to carry out useful predictive analyses of solid propellant rocket or ramjet combustion oscillation problems, it is necessary that all loss and gain mechanisms be accounted for. Recent motor experience has demonstrated that flow of oscillatory energy from vortex shedding to the acoustic field of the chamber is one of these mechanisms; in the ramjet problem it is probably the major source of oscillatory behavior. The coupling between the vortex instability which arises in regions of highly sheared flow and the chamber acoustic field represents a problem of great complexity. In this paper, a detailed analysis is described which addresses several basic features of this coupling. Some of the goals of the analysis are: (1) Determine growth rate corrections for use in standard stability assessment codes, (2) Determine the limit cycle processes of the vortical region of flow, and (3) Assess the global limiting behavior of the coupled nonlinear acoustical/vortical flow.

Descriptors :   *VORTICES, *ACOUSTIC WAVES, *COMBUSTION CHAMBERS, *SOLID PROPELLANT ROCKET ENGINES, *RAMJET ENGINES, COMBUSTION, OSCILLATION, ENERGY TRANSFER, VORTEX SHEDDING, ACOUSTIC FIELDS, COMBUSTION STABILITY, SHEAR PROPERTIES, PERTURBATION THEORY, SYMPOSIA

Distribution Statement : APPROVED FOR PUBLIC RELEASE