Effects of Test Cell Recirculation on High-Bypass Turbofan Engines during Simulated Altitude Tests
Final rept. Oct 1984-May 1985
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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An experimental and analytical program was conducted to determine the nature of the flow field around a subscale model of a high bypass turbofan engine installed in a representatively scaled altitude test cell. The engine model employed variable geometry and flow conditions in order to determine their effects on test cell recirculating flows, which can affect engine performance during altitude testing. Flow field data were obtained from both two axis laser Doppler velocimeters, as well as from pressure and temperature instrumentation installed on the model and test cell. Review of full and 110 scale test data and the results of the subscale tests indicate that test cell recirculation effects are a function of cell geometry. Measurement of test cell effects is dependent on a baseline test configuration, such as an outdoor test, where the effects are not present.
- Fluid Mechanics
- Jet and Gas Turbine Engines