Jet Engine Data Analysis DARPA-funded experiments at United Technologies Research Center Hartford Connecticut Jet engine combustion instability - also occurs in turbomachinery Thermo-acoustic instability; a periodic self-sustained oscillation Interaction between heat release rate and acoustics Results in engine “Hooting” or “Howling” - audible tone Occurs at low equivalence (fuel-to-air) ratio ! Low ! is good for pollution - low NOx - and maintenance Hooting destroys the benefits Periodically very high then very low temperatures Describe this mathematically using a model Then look for a control approach 1 Saturday, 5 November, 2011
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Jet Engine Data Analysis - University of California, …oodgeroo.ucsd.edu/.../Notes_and_docs_files/04EngineExample.pdf · Jet Engine Data Analysis DARPA-funded experiments at United
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Jet Engine Data Analysis
DARPA-funded experiments at United Technologies Research Center Hartford ConnecticutJet engine combustion instability - also occurs in turbomachinery
Thermo-acoustic instability; a periodic self-sustained oscillationInteraction between heat release rate and acoustics
Results in engine “Hooting” or “Howling” - audible toneOccurs at low equivalence (fuel-to-air) ratio !
Low ! is good for pollution - low NOx - and maintenanceHooting destroys the benefits
Periodically very high then very low temperaturesDescribe this mathematically using a model
Then look for a control approach1
Saturday, 5 November, 2011
Single-nozzle rigone combustor from a ring
measure pressuremeasure heat release rate
5,000 Hz sampling
Experimental Set-up
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Theory - Rayleigh 1877Experiment - Rijke Tube 1859
- bunsen burner in an open tube with a wire gauze mesh