Accession Number : AD0453315


Title :   THE STATIC PRESSURE DISTRIBUTION AROUND A CIRCULAR JET EXHAUSTING NORMALLY FROM A PLANE WALL INTO AN AIRSTREAM,


Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)


Personal Author(s) : Bradbury,L J S ; Wood,M N


Report Date : Aug 1964


Pagination or Media Count : 37


Abstract : Measurements have been made of the static pressure distribution on the wall around a circular jet exhausting normally from one wall of a wind tunnel into the mainstream flow through the tunnel. The measurements show the way in which the pressure distributions vary with the ratio of jet to free-stream velocity and also show the regions on the wall which contribute most to the overall suction force on the wall. These overall suction forces are shown to be of the right order of magnitude to account for the lift loss observed on models of direct jet lift VTOL aircraft. Theoretical work on the problem is briefly discussed and it is shown that a particularly simple model of the flow which has previously been suggested on a number of occasions is not really adequate. Some details of an alternative model which is proving more successful are given. (Author)


Descriptors :   *VERTICAL TAKEOFF AIRCRAFT , *JET FLOW , LIFT , AXISYMMETRIC FLOW , PRESSURE , DISTRIBUTION , BOUNDARY LAYER , THICKNESS , WINGS , VELOCITY , MEASUREMENT , INTERFERENCE


Distribution Statement : APPROVED FOR PUBLIC RELEASE