en>Denispir: section Gottlob Frege

2013-05-15T13:35:12Z

section Gottlob Frege

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	=~~= Alexander Mcqueen Pink Scarf Online ==~~		{{Refimprove\|date=December 2007}}
			[[File:SPvortex.JPG\|right\|thumb\|400px\|Photo showing stagnation point and attached [[vortex]] at an un-[[Aircraft fairing\|faired]] wing-root to fuselage junction on a [[Schempp-Hirth Janus]] C [[Glider (sailplane)\|glider]].]]

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			The [[Bernoulli's principle\|Bernoulli equation]] applicable to [[incompressible flow]] shows that the [[stagnation pressure]] is equal to the [[dynamic pressure]] plus [[static pressure]]. ''Total pressure'' is also equal to dynamic pressure plus static pressure so, in incompressible flows, stagnation pressure is equal to total pressure. <ref name=Clancy3.5 /> (In [[compressible flow]]s, stagnation pressure is also equal to total pressure providing the fluid entering the stagnation point is brought to rest [[Isentropic flow\|isentropically]].)<ref>Clancy, L.J. ''Aerodynamics'', Section 3.12</ref>

			==Pressure coefficient==
			This information can be used to show that the [[pressure coefficient]] <math>C_p</math> at a stagnation point is [[Unity (mathematics)\|unity]] (positive one):<ref name=Clancy3.6>Clancy, L.J. ''Aerodynamics'', Section 3.6</ref>
			:<math>C_p={p-p_\infty \over q_\infty}</math>

			where:
			:<math>C_p</math> is [[pressure coefficient]]
			:<math>p</math> is [[static pressure]] at the point at which pressure coefficient is being evaluated
			:<math>p_\infty</math> is static pressure at points remote from the body ([[freestream]] static pressure)
			:<math>q_\infty</math> is [[dynamic pressure]] at points remote from the body (freestream dynamic pressure)

			Stagnation pressure minus freestream static pressure is equal to freestream dynamic pressure; therefore the pressure coefficient <math>C_p</math> at stagnation points is +1.<ref name=Clancy3.6/>

			==Kutta condition==
			On a streamlined body fully immersed in a [[potential flow]], there are two stagnation points—one near the leading edge and one near the trailing edge. On a body with a sharp point such as the [[trailing edge]] of a [[wing]], the [[Kutta condition]] specifies that a stagnation point is located at that point. The [[Streamlines, streaklines and pathlines\|streamline]] at a stagnation point is perpendicular to the surface of the body.

			==Notes==
			{{reflist}}

			==References==
			*Clancy, L.J. (1975), ''Aerodynamics'', Pitman Publishing Limited, London. ISBN 0-273-01120-0

			[[Category:Fluid dynamics]]

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== Alexander Mcqueen Pink Scarf Online ==

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en>Denispir: section Gottlob Frege

en>Cydebot: Robot - Moving category Meaning to :Category:Meaning (philosophy of language) per CFD at Wikipedia:Categories for discussion/Log/2012 January 26.