Applications of Various Methods of Analysis to Combustion Instabilities in Solid Propellant Rockets

摘要

Instabilities of motions in a combustion chamber are consequences of the coupled dynamics ofudcombustion processes and of the flow in the chamber. The extreme complexities of the problemudalways require approximations of various sorts to make progress in understanding theudmechanisms and behavior of combustion instabilities. This paper covers recent progress in theudsubject, mainly summarizing efforts in two areas: approximate analysis based on a form ofudGalerkin's method, particularly useful for understanding the global linear and nonlinearuddynamics of combustion instabilities and numerical simulations intended to accommodate asudfully as possible fundamental chemical processes in both the condensed and gaseous phases.udOne purpose of current work is to bring closer together these approaches to produce moreudcomprehensive and detailed realistic results applicable to the interpretation of observationsudand for design of new rockets for both space and military applications. Particularly importantudare the goals of determining the connections between chemical composition and instabilities;udand the influences of geometry on nonlinear behavior.