| タイトル | Comparison of X-31 Flight and Ground-Based Yawing Moment Asymmetries at High Angles of Attack |
| 本文（外部サイト） | http://hdl.handle.net/2060/20010055264 |
| 著者（英） | Cobleigh, Brent R.; Croom, Mark A. |
| 著者所属（英） | NASA Dryden Flight Research Center |
| 発行日 | 2001-05-01 |
| 言語 | eng |
| 内容記述 | Significant yawing moment asymmetries were encountered during the high-angle-of-attack envelope expansion of the two X-31 aircraft. These asymmetries caused position saturations of the thrust-vectoring vanes and trailing-edge flaps during some stability-axis rolling maneuvers at high angles of attack. The two test aircraft had different asymmetry characteristics, and ship two has asymmetries that vary as a function of Reynolds number. Several aerodynamic modifications have been made to the X-31 forebody with the goal of minimizing the asymmetry. These modifications include adding transition strips on the forebody and noseboom, using two different length strakes, and increasing nose bluntness. Ultimately, a combination of forebody strakes, nose blunting, and noseboom transition strips reduced the yawing moment asymmetry enough to fully expand the high-angle-of-attack envelope. Analysis of the X-31 flight data is reviewed and compared to wind-tunnel and water-tunnel measurements. Several lessons learned are outlined regarding high-angle-of-attack configuration design and ground testing. |
| NASA分類 | Aircraft Design, Testing and Performance |
| レポートNO | Paper MP-69-P-42
H-2455
NASA/TM-2001-210393
NAS 1.15:210393 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/92951 |
