Study of Stator-vane Fluctuating Pressures in a Turbofan Engine for Static and Flight TestsNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1984 - Airplanes - 51 pages |
Common terms and phrases
14x103 Engine speed 16 20 Frequency amplitude blade-passage frequency boundary layer broadband bypass data bypass duct Bypass stator bypass vanes Bypass-stator vane coherence and phase core and bypass core compressor core data Core stator core-stator vanes engine rotational speed engine speed increases F₁ BPF tones F2 BPF fan-rotor F Figure 24 flight data flight tests flight-test engine speeds flow fluctuating pressure levels function of engine harmonics high-speed compressor inflow control device inlet JT15D-1 engine Langley Research Center Location O A magnitude measured at fan-rotor narrow-band 50 Hz narrow-band random noise NASA phase relationships presented in figure pressure levels measured pressure time traces pressures measured probability density function probability density ratios 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