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Estimating engine airflow in gas-turbine powered aircraft with clean and distorted inlet flows
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Steenken, W. G. Williams, J. G. Yuhas, A. J. |
| Copyright Year | 1996 |
| Description | The P404-GF-400 Powered F/A-18A High Alpha Research Vehicle (HARV) was used to examine the impact of inlet-generated total-pressure distortion on estimating levels of engine airflow. Five airflow estimation methods were studied. The Reference Method was a fan corrected airflow to fan corrected speed calibration from an uninstalled engine test. In-flight airflow estimation methods utilized the average, or individual, inlet duct static- to total-pressure ratios, and the average fan-discharge static-pressure to average inlet total-pressure ratio. Correlations were established at low distortion conditions for each method relative to the Reference Method. A range of distorted inlet flow conditions were obtained from -10 deg. to +60 deg. angle of attack and -7 deg. to +11 deg. angle of sideslip. The individual inlet duct pressure ratio correlation resulted in a 2.3 percent airflow spread for all distorted flow levels with a bias error of -0.7 percent. The fan discharge pressure ratio correlation gave results with a 0.6 percent airflow spread with essentially no systematic error. Inlet-generated total-pressure distortion and turbulence had no significant impact on the P404-GE400 engine airflow pumping. Therefore, a speed-flow relationship may provide the best airflow estimate for a specific engine under all flight conditions. |
| File Size | 2126512 |
| Page Count | 80 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970027377 |
| Archival Resource Key | ark:/13960/t0kt1mt4v |
| Language | English |
| Publisher Date | 1996-09-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Static Pressure Turbulence Flow Distortion Flight Conditions Calibrating Flow Measurement Measuring Instruments Gas Turbine Engines Inlet Flow F-18 Aircraft Engine Tests Air Flow Systematic Errors Inlet Pressure Turbofans Flow Velocity Pressure Ratio Angle of Attack 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 |
