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Full-Text Articles in Aerospace Engineering
Effect Of Unsteady Combustion On The Stability Of Rocket Engines, Tina Morina Rice
Effect Of Unsteady Combustion On The Stability Of Rocket Engines, Tina Morina Rice
Doctoral Dissertations
Combustion instability is a problem that has plagued the development of rocket-propelled devices since their conception. It is characterized by the occurrence of high-frequency nonlinear gas oscillations inside the combustion chamber. This phenomenon degrades system performance and can result in damage to both structure and instrumentation.
The goal of this dissertation is to clarify the role of unsteady combustion in the combustor instability problem by providing the first quantified estimates of its effect upon the stability of liquid rocket engines. The combination of this research with a new system energy balance method, accounting for all dynamic interactions within a system, …
A Study Of Nonlinear Combustion Instability, Eric J. Jacob
A Study Of Nonlinear Combustion Instability, Eric J. Jacob
Doctoral Dissertations
Combustion instability (CI) has been persistent in all forms of propulsion since their inception. CI is characterized by pressure oscillations within the propulsion system. If even a small fraction of the dense energy within the system is converted to acoustic oscillations the system vibrations can be devastating. The coupling of combustion and fluid dynamic phenomena in a nonlinear system poses CI as a significant engineering challenge.
Drawing from previous analysis, second order acoustic energy models are taken to third order. Second order analysis predicts exponential growth. The addition of the third order terms capture the nonlinear acoustic phenomena (such as …