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SUMMARY:Propeller noise - the problem of ingested turbulence - Rosie Robis
 on (University of Cambridge)
DTSTART:20081024T110000Z
DTEND:20081024T120000Z
UID:TALK13451@talks.cam.ac.uk
CONTACT:Carlo Quaglia
DESCRIPTION:One of the great advances in aircraft efficiency has been the 
 development of the open rotor engine. This incorporates two huge\, counter
 -rotating propellers which lie outside the nacelle. Unfortunately\, these 
 are incredibly noisy and a major design issue exists in bringing the noise
  down to acceptable levels. Our work considers one particular aspect of th
 is problem\, termed unsteady distortion noise\, which arises from the 'sli
 cing' of turbulent eddies from the atmosphere as they pass through the rot
 ors\, producing unsteady forces on the blades.\n\nThis work aims to addres
 s questions including: the reliability of ground-based testing as a noise 
 prediction tool\; the influence of asymmetries\, such as the presence of t
 he fuselage on one side of the rotors\; and the effect an upstream engine 
 exhaust may have. This talk is very much of work-in-progress\, as I enter 
 my second year of a PhD in DAMTP\, and should be pretty accessible to most
  CUED PhD students.
LOCATION:Language Unit Meeting Room
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