Fountain-Jet Turbulence.
Abstract
A series of experiments was conducted on a model to investigate the characteristics of fountain jets that develop beneath hovering VSTOL aircraft. The results confirm the results of previous studies in that normally developing fountains possess abnormally high turbulence levels that can be reduced by the presence of trip devices placed along the fountain stagnation line. The present work shows that fountain turbulence is highly anisotropic with the intensity of the streamwise component an order of magnitude greater than the cross component. Further, the anamoly appears to occur only in fountains produced by jets of air that strike normal to the ground surface; jets that strike at angles other than the perpendicular do not appear to generate highly turbulent fountains. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1980
- Accession Number
- ADA098098
Entities
People
- Dennis B. Finlay
- William H. Foley
Organizations
- General Dynamics