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Characterization of the Test Section Walls at the 14- by 22-Foot Subsonic Tunnel
| 题名： | Characterization of the Test Section Walls at the 14- by 22-Foot Subsonic Tunnel |
| 作者： | Lunsford, Charles B.; Graves, Sharon S. |
| 关键词： | section；tunnel；sonic；wall；test；pressure；temperature；calibration；distance；motion |
| 摘要： | The test section walls of the NASA Langley Research Center 14- by 22-Foot Subsonic Tunnel are known to move under thermal and pressure loads. Videogrammetry was used to measure wall motion during the summer of 2002. In addition, a laser distancemeter was used to measure the relative distance between the test section walls at a single point. Distancemeter and videogrammetry results were consistent. Data were analyzed as a function of temperature and pressure to determine their effects on wall motion. Data were collected between 50 and 100 F, 0 and 0.315 Mach, and dynamic pressures of 0 and 120 psf. The overall motion of each wall was found to be less than 0.25 in. and less than facility personnel anticipated. The results show how motion depends on the temperature and pressure inside the test section as well is the position of the boundary layer vane. The repeatability of the measurements was -0.06 in. This report describes the methods used to record the motion of the test section walls and the results of the data analysis. Future facility plans include the development of a suitable wall restraint system and the determination of the effects of the wall motion on tunnel calibration. |
| 报告类型： | 科技报告 |
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