| Abstract | This document is provided as an interim report to the AGARD Propulsion and Energetics Panel, Working Group 15, on comparisons of the results of the Uniform Engine Testing Program (UETP) at NASA, AEDC and NRCC. The approach followed for data presentation and comparison follows the recommendations of the NASA/AEDC Interim Report (Ref. 1). Additions felt to be useful for a more detailed presentation and comparison have been included to further explore observed differences.
As recommended in Reference 1, data comparisons have been made using a common "target" high rotor speed as the independent parameter. The dependent parameters were computed from quadratic curve-fits of the nine, double data points taken at the appropriate test conditions specified in the GTP. The resulting target values are presented in both tabular and graphical forms.
In this report, to assess probable sources of data differences, facility-measured data were compared using other independent parameters in addition to high rotor speed. Initially, engine deterioration and data consistancy was reviewed for each facility. The checks involved comparisons with theoretical performance (thrust) or reference instruments (airflow and fuel flow) common to all facilities. Internal temperature and pressure profiles were examined, and any changes due to rematching of the engine components were then assessed.
Finally performance parameters were compared as specified in the GTP. Presentations of parameters as functions of low rotor speed or airflow were also included to provide further insights into differences between facility data. |
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