Jet recirculation effects in V/STOL aircraft
Abstract
Gases from the jets of lifting engines may be recirculated to the engine intakes and cause a loss of thrust. Model tests with heated jets have been made to provide data on velocities in the jet around the impingement region and to assist the correlation of model and fullscale measurements. Vertical and inclined jets have been studied under steady and transient conditions during the initial establishment of the wall jet flow and the relationship between these two cases is given. Tests with jets from nozzles moving over the ground have shown that the distance the wall jet travels before being turned back by the relative wind may be obtained from measurements with stationary jets. Experiments with heated jets have shown that a parameter including the initial dynamic pressure and the temperature of the jet may be used to correlate the vertical penetration of a free jet and the lateral extent of an impinging jet to the point where it separates from the ground due to buoyancy effects.
- Publication:
-
Journal of Sound Vibration
- Pub Date:
- May 1966
- DOI:
- 10.1016/0022-460X(66)90105-2
- Bibcode:
- 1966JSV.....3..393C