| タイトル | Supersonic jets from bevelled rectangular nozzles |
| 本文（外部サイト） | http://hdl.handle.net/2060/19940015011 |
| 著者（英） | Raman, Ganesh; Rice, Edward J. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1993-11-01 |
| 言語 | eng |
| 内容記述 | The influence of nozzle exit geometry on jet mixing and noise production was studied experimentally for a series of rectangular nozzles operating at supersonic jet velocities. Both converging (C) and converging-diverging (C-D) nozzles were built with asymmetrical (single bevel) and symmetrical (double bevel) exit chambers and with conventional straight exits for comparison. About a four decibel reduction of peak mixing noise was observed for the double bevelled C-D nozzle operated at design pressure ratio. All bevelled geometries provided screech noise reduction for under-expanded jets and an upstream mixing noise directivity shift which would be beneficial for improved acoustic treatment performance of a shrouded system. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 94N19484
NASA-TM-106403
E-8239
NAS 1.15:106403
REPT-93-WA/NCA-26 |
| 権利 | No Copyright |
