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Elimination of Intermediate-Frequency Combustion Instability in the Fastrac Engine Thrust Chamber

Author
Rocker, Marvin
Published
[2001].
Physical Description
1 electronic document
Additional Creators
Turner, Jim E. and Nesman, Tomas E.
Online Version

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Summary
A series of tests were conducted to measure the combustion performance of the Fastrac engine thrust chamber. The thrust chamber exhibited benign, yet marginally unstable combustion. The marginally unstable combustion was characterized by chamber pressure oscillations with large amplitudes and a frequency that was too low to be identified as acoustic or high-frequency combustion instability and too high to be identified as chug or low-frequency combustion instability. The source of the buzz or intermediate-frequency combustion instability was traced to the fuel venturi whose violently noisy cavitation caused resonance in the feedline downstream. Combustion was stabilized by increasing the throat diameter of the fuel venturi such that the cavitation would occur more quietly.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 20020017266.
Pennsylvania State Univ. Propulsion Research Center 13th Annual Symposium on Propulsion; 22-23 Oct. 2001; Huntsville, AL; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15968775