Study of stator-vane fluctuating pressures in a turbofan engine for static and flight tests
Arnold W. Mueller, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1984 - Technology & Engineering - 51 pages
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12 Engine speed 12 Frequency amplitude blade-passage frequency boundary layer broadband bypass data bypass duct Bypass stator coherence and phase Comparison core and bypass core compressor core data Core stator core-stator vanes data show engine speed increases F1 BPF tone Fan Noise fan-rotor F Figure 27 flight data flight tests flight-test engine speeds fluctuating pressure levels function of engine harmonics high-speed compressor inflow control device inlet JT15D-1 engine Langley Research Center magnitude measured at fan-rotor measured at location narrow-band 50 Hz narrow-band random noise NASA PDF analysis phase data phase relationships presented in figure pressure levels measured pressure time traces pressures measured probability density function probability density ratio radially outward rotor blades rotor wakes sine signal spanwise distribution spectra static and flight static tests static-test engine speeds stator locations stator vanes subsonic supersonic technique transducers transonic Turbofan Engine Unsteady