| タイトル | Flow Visualization of Density in a Cryogenic Wind Tunnel Using Planar Rayleigh and Raman Scattering |
| 本文（外部サイト） | http://hdl.handle.net/2060/20020052419 |
| 著者（英） | Shirinzadeh, Behrooz; Herring, Gregory C. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2002-06-01 |
| 言語 | eng |
| 内容記述 | Using a pulsed Nd:YAG laser (532 nm) and a gated, intensified charge-coupled device, planar Rayleigh and Raman scattering techniques have been used to visualize the unseeded Mach 0.2 flow density in a 0.3-meter transonic cryogenic wind tunnel. Detection limits are determined for density measurements by using both unseeded Rayleigh and Raman (N2 vibrational) methods. Seeding with CO2 improved the Rayleigh flow visualization at temperatures below 150 K. The seeded Rayleigh version was used to demonstrate the observation of transient flow features in a separated boundary layer region, which was excited with an oscillatory jet. Finally, a significant degradation of the laser light sheet, in this cryogenic facility, is discussed. |
| NASA分類 | Optics |
| レポートNO | L-18171
NASA/TM-2002-211630
NAS 1.15:211630 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/91507 |
