Active Control of High Frequency Combustion Instability in Aircraft Gas-Turbine Engines

Released on by National Aeronautics and Space Administration (NASA)
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  • Active Control of High Frequency Combustion Instability in Aircraft Gas-Turbine Engines Book Detail

  • Author : National Aeronautics and Space Administration (NASA)
  • Release Date : 2018-06-20
  • Publisher : Createspace Independent Publishing Platform
  • Genre :
  • Pages : 30
  • ISBN 13 : 9781721588237
  • File Size : 63,63 MB
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Active Control of High Frequency Combustion Instability in Aircraft Gas-Turbine Engines by National Aeronautics and Space Administration (NASA) PDF Summary

Book Description: Active control of high-frequency (greater than 500 Hz) combustion instability has been demonstrated in the NASA single-nozzle combustor rig at United Technologies Research Center. The combustor rig emulates an actual engine instability and has many of the complexities of a real engine combustor (i.e. actual fuel nozzle and swirler, dilution cooling, etc.) In order to demonstrate control, a high-frequency fuel valve capable of modulating the fuel flow at up to 1kHz was developed. Characterization of the fuel delivery system was accomplished in a custom dynamic flow rig developed for that purpose. Two instability control methods, one model-based and one based on adaptive phase-shifting, were developed and evaluated against reduced order models and a Sectored-1-dimensional model of the combustor rig. Open-loop fuel modulation testing in the rig demonstrated sufficient fuel modulation authority to proceed with closed-loop testing. During closed-loop testing, both control methods were able to identify the instability from the background noise and were shown to reduce the pressure oscillations at the instability frequency by 30%. This is the first known successful demonstration of high-frequency combustion instability suppression in a realistic aero-engine environment. Future plans are to carry these technologies forward to demonstration on an advanced low-emission combustor. Corrigan, Bob (Technical Monitor) and DeLaat, John C. and Chang, Clarence T. Glenn Research Center NASA/TM-2003-212611, E-14169, NAS 1.15:212611, ISABE-2003-1054

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