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On nonlinear combustion instability in liquid propellant rocket motors
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Sims, Joseph D. Majdalani, Joseph Sims, J. D. Technical Monitor Flandro, Gary A. |
| Copyright Year | 2004 |
| Description | All liquid propellant rocket instability calculations in current use have limited value in the predictive sense and serve mainly as a correlating framework for the available data sets. The well-known n-t model first introduced by Crocco and Cheng in 1956 is still used as the primary analytical tool of this type. A multitude of attempts to establish practical analytical methods have achieved only limited success. These methods usually produce only stability boundary maps that are of little use in making critical design decisions in new motor development programs. Recent progress in understanding the mechanisms of combustion instability in solid propellant rockets"' provides a firm foundation for a new approach to prediction, diagnosis, and correction of the closely related problems in liquid motor instability. For predictive tools to be useful in the motor design process, they must have the capability to accurately determine: 1) time evolution of the pressure oscillations and limit amplitude, 2) critical triggering pulse amplitude, and 3) unsteady heat transfer rates at injector surfaces and chamber walls. The method described in this paper relates these critical motor characteristics directly to system design parameters. Inclusion of mechanisms such as wave steepening, vorticity production and transport, and unsteady detonation wave phenomena greatly enhance the representation of key features of motor chamber oscillatory behavior. The basic theoretical model is described and preliminary computations are compared to experimental data. A plan to develop the new predictive method into a comprehensive analysis tool is also described. |
| File Size | 1150692 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040085915 |
| Archival Resource Key | ark:/13960/t6zw6dk0z |
| Language | English |
| Publisher Date | 2004-07-11 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Pulse Amplitude Combustion Stability Pressure Oscillations Vorticity Nonlinearity Mathematical Models Liquid Propellant Rocket Engines Design Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
