Loading...
Please wait, while we are loading the content...
Active control of high frequency combustion instability in aircraft gas-turbine engines
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Corrigan, Bob Technical Monitor Chang, Clarence T. DeLaat, John C. |
| Copyright Year | 2003 |
| 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. |
| File Size | 940560 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030068103 |
| Archival Resource Key | ark:/13960/t0cv9g24v |
| Language | English |
| Publisher Date | 2003-09-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Fuel Systems Combustion Stability Pressure Oscillations Fuel Tests Gas Turbine Engines Pressure Reduction Fuel Valves Fuel Flow High Frequencies Aircraft Engines Active Control 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 |
