| タイトル | Performance Optimization of a Rotor Alone Nacelle for Acoustic Fan Testing |
| 本文（外部サイト） | http://hdl.handle.net/2060/20010018189 |
| 著者（英） | Cunningham, C. C.; Thompson, W. K.; Hughes, C. E. |
| 著者所属（英） | NASA Glenn Research Center |
| 発行日 | 2000-12-01 |
| 言語 | eng |
| 内容記述 | This paper describes the techniques, equipment, and results from the optimization of a two-axis traverse actuation system used to maintain concentricity between a sting-mounted fan and a wall-mounted nacelle in the 9 x 15 (9 Foot by 15 Foot Test Section) Low Speed Wind Tunnel (LSWT) at the NASA Glenn Research Center (GRC). The Rotor Alone Nacelle (RAN) system, developed at GRC by the Engineering Design and Analysis Division (EDAD) and the Acoustics Branch, used nacelle-mounted lasers and an automated control system to maintain concentricity as thermal and thrust operating loads displace the fan relative to the nacelle. This effort was critical to ensuring rig/facility safety and experimental consistency of the acoustic data from a statorless, externally supported nacelle configuration. Although the tip clearances were originally predicted to be about 0.020 in. at maximum rotor (fan) operating speed, proximity probe measurements showed that the nominal clearance was less than 0.004 in. As a result, the system was optimized through control-loop modifications, active laser cooling, data filtering and averaging, and the development of strict operational procedures. The resultant concentricity error of RAN was reduced to +/- 0.0031 in. in the Y-direction (horizontal) and +0.0035 in./-0.001 3 in. in the Z-direction (vertical), as determined by error analysis and experimental results. Based on the success of this project, the RAN system will be transitioned to other wind tunnel research programs at NASA GRC. |
| NASA分類 | Aircraft Propulsion and Power |
| レポートNO | NASA/TM-2000-210599
AIAA Paper 2001-0164
E-12557
NAS 1.15:210599 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/64405 |
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