Tests were conducted of inverted velocity profile coannular nozzles and a conical nozzle in an acoustic wind tunnel facility to simulate flight effects on jet noise generation. Coannular model nozzles were tested at fan to core nozzle exit area rations of.75 and 1.2. Fan stream jet velocity ranged up to 2000 fps at a variety of fan exhaust pressure rations and temperatures for a core stream of 1000 fps. The wind tunnel airflow was varied from static to 425 fps. The acoustic results indicated that the noise level differences seen previously under static conditions are retained in the flight environment. This work was conducted under NASA Lewis Research Center contract NAS 3-17866. (Kursetz)
Effect of simulated forward speed an the jet noise of inverted velocity profile coannular nozzles
Einfluss einer simulierten Vortriebsgeschwindigkeit auf das Strahlgeraeusch von Ringformduesen mit Umkehrstroemungsprofil
AIAA-Papers ; 1-11
1977
11 Seiten, 22 Bilder, 15 Quellen
Conference paper
English