THE EFFECTS OF IN-SERVICE DETERIORATION ON MILITARY TURBOFAN PERFORMANCE

Authors
  1. Bird, J.W.
Corporate Authors
Operational Research and Analysis Establishment, Ottawa ONT (CAN) Directorate of Mathematics and Statistics
Abstract
The effects of in-service damage and wear on military turbofan performance are investigated. Relationships between measurable physical changes in engine components and losses in engine performance are developed in a two-step process. Measurable damage and wear are related to efficiency and mass flow losses in turbines or compressors from a collection of empirical and experimental data. A digital computer model of a twin-spool mixed-flow turbofan is employed to determine the resulting changes in thrust, specific fuel consumption, turbine life and compressor surge margin. A method is presented to calculate the degradation in mission capability for two representative military tasks. The identification of a deteriorated component by observing easily monitorable parameters is described. Data and procedures are included to allow further investigations of the consequences of in-service deterioration of a military turbofan.
Report Number
DAOR-STAFFNOTE-80/5 —
Date of publication
15 Mar 1980
Number of Pages
79
DSTKIM No
80-01191
CANDIS No
88889
Format(s):
Hardcopy;Originator's fiche received by DSIS

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