| 词汇 | autorotation |
| 释义 | autorotation noun[ C or U ] uk /ˌɔː.təʊ.rəʊˈteɪ.ʃən/ us /ˌɑː.t̬oʊ.roʊˈteɪ.ʃən/ the turning of the blades of a helicopter(= an aircraft with spinning blades on top that can take off and land vertically) without using power from the engine, or a single spin of these blades: As a helicopter flight instructor, she was well practiced in performing autorotations in the event of engine failure. Autorotation works much in the way of a parachute, with air pressure creating lift on the rotor as the aircraft descends. If a helicopter's engine power fails, the pilot can attempt a landing using autorotation, which resembles a maple seed pod spinning to the ground. Air travel: aviation aerial bombardment aerobatic aerobatics aerodynamically aeronautic aeronautical aerospace aircraft airline fly-by-wire flyby flyer glide path holding pattern hypersonic loop the loopidiom pancake landing pressurize stack tailspin You can also find related words, phrases, and synonyms in the topics: Air travel: fixed-wing aircraft & helicopters Examples of autorotationautorotation The proper interplay of those conditions, which include synchronization of vortex shedding and rate of rotation, results in autorotation. An initial impulse is always necessary to obtain autorotation. Thus, a sharp edge is most favourable for autorotation. Sometimes, aerodynamicists consider any continuous rotation of a body in a parallel flow without external sources of energy as autorotation. A few historical notes on the autorotation of plates will inform the reader of the physical problems involved and of the areas of application. If this initial impulse is too weak, the plate will oscillate a few times, and the motion may then come either to a stop or it may become autorotation. This indicates (and will be later elaborated on) that a local event like delayed vortex shedding behind the retreating edge by itself is not sufficient to explain autorotation. As in the supporting period, the above situation shows that the delay of vortex shedding at the retreating edge by itself is insufficient to describe autorotation. In both cases numerical computations would require a number of trials with excessively long computer runs to arrive at a solution for the state of autorotation. This high altitude autorotation also set a new world record. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In the event of engine failure and the resulting autorotation, the pilot may not have enough cyclic control to flare properly for the landing. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In case of an engine failure, the switch from helicopter to autorotation was automatic. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Much time is spent in training practicing various types of autorotation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A successful autorotation was performed to a dry riverbed. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In the event of power loss, autorotation was found to be difficult due to the drag from the ramjet nacelles. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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