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.


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    Title :

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


    Contributors:

    Conference:

    High-Angle-of-Attack Technology ; 1996 ; Hampton, VA, United States


    Publication date :

    1996-09-01


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English







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    Alford, J.S. / Davies, D.P. / Young, L.C. | Engineering Index Backfile | 1962


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    Davies, D. P. / Alford, J. S. / Young, L. C. | SAE Technical Papers | 1962