2008년 3월 19일 (수) 20:52 판 편집 Wikier (토론 \| 기여) 5,084 편집 잔글 재분류 ← 이전 편집		2008년 3월 20일 (목) 11:05 판 편집 편집 취소 222.117.158.199 (토론) →‎특성 다음 편집 →
7번째 줄: * 소용돌이는 중심이 움직이는 [[토네이도]]를 의미하며 토네이도는 좌우상하로 움직인다. * 소용돌이의 유체 압력은 중앙에서 최저이다. 그리고 중심에서 멀어질수록 점진적으로 상승한다. 이것은 [[베르누이 원리]]와 일치한다. 공기중의 소용돌이의 핵심은 핵심의 저압내에 응축에의해 유발된 수증기의 플룸 때문에 때때로 보일수 있다. <!--▼ <!-- The fluid pressure in a vortex is lowest in the center where the speed is greatest, and rises progressively with distance from the center. This is in accordance with [[Bernoulli's Principle]]. The core of a vortex in air is sometimes visible because of a plume of water vapour caused by [[condensation]] in the low pressure of the core. The spout of a [[tornado]] is a classic and frightening example of the visible core of a vortex. A [[dust devil]] is also the core of a vortex, made visible by the dust drawn upwards by the turbulent flow of air from ground level into the low pressure core. --> 모든 소용돌이의 핵심은 소용돌이 선을 포함한다고 고려될 수 있고 소용돌이의 모든 입자는 소용돌이 선주위를 회전한다고 고려될 수 있다. 소용돌이 선은 유체의 경계에서 시작하고 끝나지만 유체내에서 시작하거나 끝나지는 않는다. * The core of every vortex can be considered to contain a vortex line, and every particle in the vortex can be considered to be circulating around the vortex line. Vortex lines start and end at the boundary of the fluid, but they do not start or end in the fluid. (See [[Helmholtz's theorems]].) Vortices readily deflect and attach themselves to a solid surface. For example, a vortex usually forms ahead of the [[Propeller\|propeller disk]] or [[jet engine]] of a slow-moving [[Fixed-wing aircraft\|airplane]]. One end of the vortex line is attached to the propeller disk or jet engine, but when the airplane is taxiing the other end of the vortex line readily attaches itself to the ground rather than end in midair. The vortex can suck water and small stones into the core and then into the propeller disk or jet engine.▼ ▲<!-- ▲* The core of every vortex can be considered to contain a vortex line, and every particle in the vortex can be considered to be circulating around the vortex line. Vortex lines start and end at the boundary of the fluid, but they do not start or end in the fluid. (See [[Helmholtz's theorems]].) Vortices readily deflect and attach themselves to a solid surface. For example, a vortex usually forms ahead of the [[Propeller\|propeller disk]] or [[jet engine]] of a slow-moving [[Fixed-wing aircraft\|airplane]]. One end of the vortex line is attached to the propeller disk or jet engine, but when the airplane is taxiing the other end of the vortex line readily attaches itself to the ground rather than end in midair. The vortex can suck water and small stones into the core and then into the propeller disk or jet engine. --> <!-- * Two or more vortices that are approximately parallel and circulating in the same direction will quickly merge to form a single vortex. The [[Circulation (fluid dynamics)\|circulation]] of the merged vortex will equal the sum of the [[Circulation (fluid dynamics)\|circulations]] of the constituent vortices. For example, a sheet of small vortices flows from the trailing edge of the wing or propeller of an airplane when the wing is developing [[Lift (force)\|lift]] or the propeller is developing [[thrust]]. In less than one wing [[Chord (aircraft)\|chord]] downstream of the trailing edge of the wing these small vortices merge to form a single vortex. If viewed from the tail of the airplane, looking forward in the direction of flight, there is one [[Wingtip vortices\|wingtip vortex]] trailing from the left-hand wing and circulating clockwise, and another wingtip vortex trailing from the right-hand wing and circulating anti-clockwise. The result is a region of downwash behind the wing, between the pair of [[wingtip vortices]]. These two [[wingtip vortices]] do not merge because they are circulating in opposite directions.

소용돌이: 두 판 사이의 차이