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SUMMARY:Leading Edge Contamination and the Saga of the ‘Bleeding Slot’
  - Professor Mike Gaster\, City University\, London
DTSTART:20161028T120000Z
DTEND:20161028T130000Z
UID:TALK68680@talks.cam.ac.uk
CONTACT:Akshath Sharma
DESCRIPTION:In the late 1950’s laminar flow flying surfaces were being c
 onsidered to reduce drag on transport aircraft using suction control. It w
 as believed at that time that wind tunnels were too turbulent for testing 
 such wings and so flight research was planned on a swept suction wing desi
 gned by the Handley Page Company.  The test wing was mounted vertically on
  the fuselage of a Lancaster bomber based at Cranfield where the flight ex
 periments were made. \nThese experiments were terminated by the Ministry o
 f Aviation in 1965 because the US research using the X21 laminar flow airc
 raft made by Northrop was cancelled when the military decided not to pursu
 e their program further\nI will give an account of our work involving turb
 ulent contamination along the attachment line and ways of controlling this
 .\nSometime later\, 1985\, when Airbus were planning some flight suction e
 xperiments on an A320 fin I proposed a research programme on a new leading
  edge device for preventing contamination.  The project was assigned to On
 era who designed a new version of the ‘Bump’.  \nThe ‘Bleeding Slot
 ’ was eventually demonstrated in the Airbus wind tunnel and shown to pre
 vent contamination.  I believed that some small drag reduction could be ac
 hieved by using this device on conventional wings to maintain laminar lead
 ing edges.  This was recently demonstrated in the Airbus tunnel.
LOCATION:JDB Seminar Room\, CUED
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