application of rotor mounted pressure transducers to analysis of inlet turbulenceMiniature pressure transducers installed near the leading edge of a fan blade were used to diagnose the non-uniform flow entering a subsonic tip speed turbofan on a static test stand. The pressure response of the blade to the inlet flow variations was plotted in a form which shows the space-time history of disturbances ingested by the rotor. Also, periodically sampled data values were auto- and cross-correlated as if they had been acquired from fixed hot wire anemometers at 150 equally spaced angles around the inlet. With a clean inlet and low wind, evidence of long, narrow turbulence eddies was easily found both in the boundary layer of the fan duct and outside the boundary layer. The role of the boundary layer was to follow and amplify disturbances in the outer flow. These eddies frequently moved around the inlet with a corkscrew motion as they passed through.
Hanson, D. B. (Hamilton Standard Windsor Locks, CT, United States)
August 8, 2013
April 1, 1976
Publication: AGARD Unsteady Phenomena in Turbomachinery
IDRelationTitle19760017203Analytic PrimaryMathematical theory of the Goddard trajectory determination systemDocument Inquiryvisibility_off