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A theoretical evaluation of rigid baffles in suppression of combustion instability
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Baer, M. R. Mitchell, C. E. |
| Copyright Year | 1976 |
| Description | An analytical technique for the prediction of the effects of rigid baffles on the stability of liquid propellant combustors is presented. This analysis employs a three dimensional combustor model characterized by a concentrated combustion source at the chamber injector and a constant Mach number nozzle. An eigenfunction-matching method is used to solve the linearized partial differential equations describing the unsteady flow field. Boundary layer corrections to this unsteady flow are used in a mechanical energy dissipation model to evaluate viscous and turbulence effects within the flow. An integral stability relationship is then employed to predict the decay rate of the oscillations.||||||||Results of this analysis agree qualitatively with experimental observations and show that sufficient dissipation exists to indicate that the proper mechanism of baffle damping is a fluid dynamic loss. The response of the dissipation model to varying baffle blade length, mean flow Mach number and oscillation amplitude is examined. |
| File Size | 7794363 |
| Page Count | 248 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770005215 |
| Archival Resource Key | ark:/13960/t3gx93c96 |
| Language | English |
| Publisher Date | 1976-09-13 |
| Access Restriction | Open |
| Subject Keyword | Combustion Instability Injector Face Baffles Liquid Rockets Rigid Structures Nozzle Flow Combustion Stability Baffles Fluid Flow Eigenvalues Liquid Propellant Rocket Engines Combustion Chambers Three Dimensional Models Prediction Analysis Techniques Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
