File:ECN-7848a.jpg
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DescriptionECN-7848a.jpg |
English: Dryden Flight Research Center, Edwards, California, conducted extensive wake vortice tests beginning in the 1970's. These wake vortex problems first became a serious concern when large jetliners were first introduced. The aircraft's trailing vortices, created by any large-bodied aircraft, were powerful enough to cause problems for business jets and even other airliners.
Dryden became interested in vortex research both for safety and as a matter of aerodynamics. A wingtip vortex seriously reduces efficency, causing drag, and therefore a consequent penalty in fuel consumption and performance. The majority of the tests were conducted using spoilers on a Boeing 747-100, which NASA had just acquired for the Space Shuttle Approach and Landing (ALT) tests. With the two spoilers on the outer panels of each wing extended, the vortices were greatly reduced and the chase aircraft could safely fly five kilometers behind the large aircraft, compared to 15 kilometers with no spoilers. Dryden's 747 wake vortex studies clearly indicated that the use of spoilers could reduce the severity of wake vortices. In July, 1977, the center began a brief series of tests on a Lockheed L-1011 Tristar to determine if the spoiler that worked so well on the 747 could be applied to other wide-body aircraft as well. The test showed that while spoilers on the Tristar could reduce wake vortices, they were not as effective in doing so as the spoilers on the 747. NASA is continuing wake vortex studies to this day. These projects can be expected to improve the operational safety of many future aircraft. This photo demonstrates the L-1011 with smoke generators operating, to visualize the vortex flows. |
Date | Taken on 20 July 1977 |
Source | https://www.dfrc.nasa.gov/Gallery/Photo/L-1011/HTML/ECN-7848.html |
Author | NASA/DFRC |
This image or video was catalogued by Armstrong Flight Research Center of the United States National Aeronautics and Space Administration (NASA). This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. Other languages:
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:57, 23 October 2007 | 1,600 × 1,800 (511 KB) | Jacek FH (talk | contribs) | cropped | |
23:32, 22 September 2006 | 1,600 × 2,120 (593 KB) | Andrzejmat (talk | contribs) | The photo at the right shows wingtip vortices generated by a Lockheed L-1011. These are visualized by smoke. The corkscrew character is nicely illustrated here. On the full-size version, the vortex cores are clearly visible. This experiment is part of NA |
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