| タイトル | Improving Diffusing S-duct Performance by Secondary Flow Control |
| 本文（外部サイト） | http://hdl.handle.net/2060/19940020700 |
| 著者（英） | Wendt, Bruce J.; Reichert, Bruce A. |
| 著者所属（英） | NASA Lewis Research Center |
| 発行日 | 1994-02-01 |
| 言語 | eng |
| 内容記述 | The objective of this research was to study ways to reduce inlet flow distortion (i.e., total pressure nonuniformity) and improve total pressure recovery in a diffusing S-duct. This was accomplished by controlling the development of secondary flows within the duct through the use of tapered-fin type vortex generators. Reported are results for the bare duct and seven different configurations of vortex generators. Data presented for each configuration include surface static pressure, surface flow visualization, and exit plane total pressure and transverse velocity. The performance of each configuration was assessed by calculating total pressure recovery and inlet distortion descriptors from the data and comparing them to the values for the bare duct. The best configuration tested reduced distortion (as measured by the DC(45) and DC(90) descriptors) by more than 50 percent while improving total pressure recovery by 0.5 percent. These results should provide valuable guidance in designing vortex generator installations in ducts and for assessing the accuracy of computational fluid dynamics (CFD) methods to calculate duct flows with installed vortex generators. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 94N25182
NASA-TM-106492
E-8479
NAS 1.15:106492
AIAA PAPER 94-0365 |
| 権利 | No Copyright |
