Estimating Engine Airflow in Gas-Turbine Powered Aircraft with Clean and Distorted Inlet Flows

作者: J. G. Williams

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摘要: 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 engine airflow. Five airflow estimation methods were studied. Reference Method a fan corrected speed calibration from an uninstalled test. In-flight utilized average, or individual, inlet duct static- ratios, and average fan-discharge static-pressure ratio. Correlations established at low conditions for each method relative Method. A range distorted flow obtained -10 deg. +60 angle attack -7 +11 sideslip. individual pressure ratio correlation resulted in 2.3 percent spread all with bias error -0.7 percent. discharge gave results 0.6 essentially no systematic error. Inlet-generated turbulence had significant P404-GE400 pumping. Therefore, speed-flow relationship may provide best estimate specific under flight conditions.

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