Study of Wall Jets in Duct Diffuser Systems.
Abstract
The effectiveness of wall jets in preventing diffuser stall in a simulated two-dimensional thrust augmenter was experimentally investigated. The tests were conducted in the static mode; that is, the flow through the inlet of the model was free from ram-air effects. The velocity of the airflow through the model ranged from 90 to 260 ft/s while the area ratio of the diffuser was systematically varied from 1.73 to 2.72. The wall-jet slot height was varied from 0.05 to 0.196 in. Nitrogen wall jets were found to be an effective means of suppressing stall. For a given diffuser area ratio and wall-jet slot height, the minimum wall-jet mass flow was an almost constant fraction of the primary air mass flow. From the standpoint of power required to suppress stall, larger jets were more efficient.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1975
- Accession Number
- ADA010102
Entities
People
- James M. Lefferdo
- Wendel J. Maegley
Organizations
- Martin Marietta